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silverstripe-postgresql/code/PostgreSQLDatabase.php

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<?php
/**
* @package sapphire
* @subpackage model
*/
/**
* PostgreSQL connector class.
* @package sapphire
* @subpackage model
*/
class PostgreSQLDatabase extends SS_Database {
/**
* Connection to the DBMS.
* @var resource
*/
private $dbConn;
/**
* True if we are connected to a database.
* @var boolean
*/
private $active;
/**
* The name of the database.
* @var string
*/
private $database;
/*
* This holds the name of the original database
* So if you switch to another for unit tests, you
* can then switch back in order to drop the temp database
*/
private $database_original;
/*
* This holds the parameters that the original connection was created with,
* so we can switch back to it if necessary (used for unit tests)
*/
private $parameters;
/*
* These two values describe how T-search will work.
* You can use either GiST or GIN, and '@@' (gist) or '@@@' (gin)
* Combinations of these two will also work, so you'll need to pick
* one which works best for you
*/
public $default_fts_cluster_method='GIN';
public $default_fts_search_method='@@@';
private $supportsTransactions=true;
/**
* Connect to a PostgreSQL database.
* @param array $parameters An map of parameters, which should include:
* - server: The server, eg, localhost
* - username: The username to log on with
* - password: The password to log on with
* - database: The database to connect to
*/
public function __construct($parameters) {
//We will store these connection parameters for use elsewhere (ie, unit tests)
$this->parameters=$parameters;
$this->connectDatabase();
$this->database_original=$this->database;
}
/*
* Uses whatever connection details are in the $parameters array to connect to a database of a given name
*/
function connectDatabase(){
$parameters=$this->parameters;
if(!$parameters)
return false;
($parameters['username']!='') ? $username=' user=' . $parameters['username'] : $username='';
($parameters['password']!='') ? $password=' password=' . $parameters['password'] : $password='';
if(!isset($this->database))
$dbName=$parameters['database'];
else $dbName=$this->database;
//First, we need to check that this database exists. To do this, we will connect to the 'postgres' database first
$this->dbConn = pg_connect('host=' . $parameters['server'] . ' port=5432 dbname=postgres' . $username . $password);
if(!$this->databaseExists($dbName))
$this->createDatabase($dbName);
//Now we can be sure that this database exists, so we can connect to it
$this->dbConn = pg_connect('host=' . $parameters['server'] . ' port=5432 dbname=' . $dbName . $username . $password);
//By virtue of getting here, the connection is active:
$this->active=true;
$this->database = $dbName;
if(!$this->dbConn) {
$this->databaseError("Couldn't connect to PostgreSQL database");
return false;
}
return true;
}
/**
* Not implemented, needed for PDO
*/
public function getConnect($parameters) {
return null;
}
/**
* Returns true if this database supports collations
* TODO: get rid of this?
* @return boolean
*/
public function supportsCollations() {
return true;
}
/**
* The version of PostgreSQL.
* @var float
*/
private $pgsqlVersion;
/**
* Get the version of PostgreSQL.
* @return float
*/
public function getVersion() {
if(!$this->pgsqlVersion) {
//returns something like this: PostgreSQL 8.3.3 on i386-apple-darwin9.3.0, compiled by GCC i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465)
$postgres=strlen('PostgreSQL ');
$db_version=$this->query("SELECT VERSION()")->value();
$this->pgsqlVersion = (float)trim(substr($db_version, $postgres, strpos($db_version, ' on ')));
}
return $this->pgsqlVersion;
}
/**
* Get the database server, namely PostgreSQL.
* @return string
*/
public function getDatabaseServer() {
return "postgresql";
}
public function query($sql, $errorLevel = E_USER_ERROR) {
if(isset($_REQUEST['previewwrite']) && in_array(strtolower(substr($sql,0,strpos($sql,' '))), array('insert','update','delete','replace'))) {
Debug::message("Will execute: $sql");
return;
}
if(isset($_REQUEST['showqueries'])) {
$starttime = microtime(true);
}
$handle = pg_query($this->dbConn, $sql);
if(isset($_REQUEST['showqueries'])) {
$endtime = round(microtime(true) - $starttime,4);
Debug::message("\n$sql\n{$endtime}ms\n", false);
}
DB::$lastQuery=$handle;
if(!$handle && $errorLevel) $this->databaseError("Couldn't run query: $sql | " . pg_last_error($this->dbConn), $errorLevel);
return new PostgreSQLQuery($this, $handle);
}
public function getGeneratedID($table) {
$result=DB::query("SELECT last_value FROM \"{$table}_ID_seq\";");
$row=$result->first();
return $row['last_value'];
}
/**
* OBSOLETE: Get the ID for the next new record for the table.
*
* @var string $table The name od the table.
* @return int
*/
public function getNextID($table) {
user_error('getNextID is OBSOLETE (and will no longer work properly)', E_USER_WARNING);
$result = $this->query("SELECT MAX(ID)+1 FROM \"$table\"")->value();
return $result ? $result : 1;
}
public function isActive() {
return $this->active ? true : false;
}
/*
* You can create a database based either on a supplied name, or from whatever is in the $this->database value
*/
public function createDatabase($name=false) {
if(!$name)
$name=$this->database;
$this->query("CREATE DATABASE \"$name\";");
$this->connectDatabase();
}
/**
* Drop the database that this object is currently connected to.
* Use with caution.
*/
public function dropDatabase() {
//First, we need to switch back to the original database so we can drop the current one
$db_to_drop=$this->database;
$this->selectDatabase($this->database_original);
$this->connectDatabase();
$this->query("DROP DATABASE $db_to_drop");
}
/**
* Returns the name of the currently selected database
*/
public function currentDatabase() {
return $this->database;
}
/**
* Switches to the given database.
* If the database doesn't exist, you should call createDatabase() after calling selectDatabase()
*/
public function selectDatabase($dbname) {
$this->database=$dbname;
$this->tableList = $this->fieldList = $this->indexList = null;
return true;
}
/**
* Returns true if the named database exists.
*/
public function databaseExists($name) {
// We have to use addslashes here, since there may not be a database connection to base the Convert::raw2sql
// function off.
$SQL_name=addslashes($name);
return $this->query("SELECT datname FROM pg_database WHERE datname='$SQL_name';")->first() ? true : false;
}
public function createTable($tableName, $fields = null, $indexes = null, $options = null, $extensions = null) {
$fieldSchemas = $indexSchemas = "";
if($fields) foreach($fields as $k => $v) $fieldSchemas .= "\"$k\" $v,\n";
if(isset($this->class)){
$addOptions = (isset($options[$this->class])) ? $options[$this->class] : null;
} else $addOptions=null;
//First of all, does this table already exist
$doesExist=$this->TableExists($tableName);
if($doesExist)
return false;
//If we have a fulltext search request, then we need to create a special column
//for GiST searches
$fulltexts='';
$triggers='';
if($indexes){
foreach($indexes as $name=>$this_index){
if($this_index['type']=='fulltext'){
$ts_details=$this->fulltext($this_index, $tableName, $name);
$fulltexts.=$ts_details['fulltexts'];
$triggers.=$ts_details['triggers'];
}
}
}
if($indexes) foreach($indexes as $k => $v) $indexSchemas .= $this->getIndexSqlDefinition($tableName, $k, $v) . "\n";
//Do we need to create a tablespace for this item?
if($extensions && isset($extensions['tablespace'])){
$this->createOrReplaceTablespace($extensions['tablespace']['name'], $extensions['tablespace']['location']);
$tableSpace=' TABLESPACE ' . $extensions['tablespace']['name'];
} else
$tableSpace='';
$this->query("CREATE TABLE \"$tableName\" (
$fieldSchemas
$fulltexts
primary key (\"ID\")
)$tableSpace; $indexSchemas $addOptions");
if($triggers!=''){
$this->query($triggers);
}
//If we have a partitioning requirement, we do that here:
if($extensions && isset($extensions['partitions'])){
$this->createOrReplacePartition($tableName, $extensions['partitions'], $indexes, $extensions);
}
//Lastly, clustering goes here:
if($extensions && isset($extensions['cluster'])){
DB::query("CLUSTER \"$tableName\" USING \"{$extensions['cluster']}\";");
}
return $tableName;
}
/**
* Alter a table's schema.
* @param $table The name of the table to alter
* @param $newFields New fields, a map of field name => field schema
* @param $newIndexes New indexes, a map of index name => index type
* @param $alteredFields Updated fields, a map of field name => field schema
* @param $alteredIndexes Updated indexes, a map of index name => index type
*/
public function alterTable($tableName, $newFields = null, $newIndexes = null, $alteredFields = null, $alteredIndexes = null, $alteredOptions = null, $advancedOptions = null) {
$fieldSchemas = $indexSchemas = "";
$alterList = array();
if($newFields) foreach($newFields as $k => $v) $alterList[] .= "ADD \"$k\" $v";
if($alteredFields) {
foreach($alteredFields as $k => $v) {
$val=$this->alterTableAlterColumn($tableName, $k, $v);
if($val!='')
$alterList[] .= $val;
}
}
//Do we need to do anything with the tablespaces?
if($alteredOptions && isset($advancedOptions['tablespace'])){
$this->createOrReplaceTablespace($advancedOptions['tablespace']['name'], $advancedOptions['tablespace']['location']);
$this->query("ALTER TABLE \"$tableName\" SET TABLESPACE {$advancedOptions['tablespace']['name']};");
}
//DB ABSTRACTION: we need to change the constraints to be a separate 'add' command,
//see http://www.postgresql.org/docs/8.1/static/sql-altertable.html
$alterIndexList=Array();
if($alteredIndexes) foreach($alteredIndexes as $v) {
//We are only going to delete indexes which exist
$indexes=$this->indexList($tableName);
if(isset($indexes[$v['value']])){
if(is_array($v))
$alterIndexList[] = 'DROP INDEX ix_' . strtolower($tableName) . '_' . strtolower($v['value']) . ';';
else
$alterIndexList[] = 'DROP INDEX ix_' . strtolower($tableName) . '_' . strtolower(trim($v, '()')) . ';';
$k=$v['value'];
$alterIndexList[] .= $this->getIndexSqlDefinition($tableName, $k, $v);
}
}
//Add the new indexes:
if($newIndexes) foreach($newIndexes as $k=>$v){
//Check that this index doesn't already exist:
$indexes=$this->indexList($tableName);
if(isset($indexes[trim($v, '()')])){
if(is_array($v)){
$alterIndexList[] = 'DROP INDEX ix_' . strtolower($tableName) . '_' . strtolower($v['value']) . ';';
} else {
$alterIndexList[] = 'DROP INDEX ' . $indexes[trim($v, '()')]['indexname'] . ';';
}
}
$alterIndexList[] = $this->getIndexSqlDefinition($tableName, $k, $v);
}
if($alterList) {
$alterations = implode(",\n", $alterList);
$this->query("ALTER TABLE \"$tableName\" " . $alterations);
}
//Do we need to create a tablespace for this item?
if($advancedOptions && isset($advancedOptions['extensions']['tablespace'])){
$extensions=$advancedOptions['extensions'];
$this->createOrReplaceTablespace($extensions['tablespace']['name'], $extensions['tablespace']['location']);
}
if($alteredOptions && isset($this->class) && isset($alteredOptions[$this->class])) {
$this->query(sprintf("ALTER TABLE \"%s\" %s", $tableName, $alteredOptions[$this->class]));
Database::alteration_message(
sprintf("Table %s options changed: %s", $tableName, $alteredOptions[$this->class]),
"changed"
);
}
foreach($alterIndexList as $alteration)
$this->query($alteration);
//If we have a partitioning requirement, we do that here:
if($advancedOptions && isset($advancedOptions['partitions'])){
$this->createOrReplacePartition($tableName, $advancedOptions['partitions']);
}
//Lastly, clustering goes here:
if($advancedOptions && isset($advancedOptions['cluster'])){
DB::query("CLUSTER \"$tableName\" USING ix_{$tableName}_{$advancedOptions['cluster']};");
} else {
//Check that clustering is not on this table, and if it is, remove it:
//This is really annoying. We need the oid of this table:
$stats=DB::query("SELECT relid FROM pg_stat_user_tables WHERE relname='$tableName';")->first();
$oid=$stats['relid'];
//Now we can run a long query to get the clustered status:
//If anyone knows a better way to get the clustered status, then feel free to replace this!
$clustered=DB::query("SELECT c2.relname, i.indisclustered FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i WHERE c.oid = '$oid' AND c.oid = i.indrelid AND i.indexrelid = c2.oid AND indisclustered='t';")->first();
if($clustered)
DB::query("ALTER TABLE \"$tableName\" SET WITHOUT CLUSTER;");
}
}
/*
* Creates an ALTER expression for a column in PostgreSQL
*
* @param $tableName Name of the table to be altered
* @param $colName Name of the column to be altered
* @param $colSpec String which contains conditions for a column
* @return string
*/
private function alterTableAlterColumn($tableName, $colName, $colSpec){
// First, we split the column specifications into parts
// TODO: this returns an empty array for the following string: int(11) not null auto_increment
// on second thoughts, why is an auto_increment field being passed through?
$pattern = '/^([\w()]+)\s?((?:not\s)?null)?\s?(default\s[\w\']+)?\s?(check\s[\w()\'",\s]+)?$/i';
preg_match($pattern, $colSpec, $matches);
/*if (isset($matches)) {
echo "sql:$colSpec <pre>";
print_r($matches);
echo '</pre>';
}*/
if(sizeof($matches)==0)
return '';
if($matches[1]=='serial8')
return '';
if(isset($matches[1])) {
$alterCol = "ALTER COLUMN \"$colName\" TYPE $matches[1]\n";
// SET null / not null
if(!empty($matches[2])) $alterCol .= ",\nALTER COLUMN \"$colName\" SET $matches[2]";
// SET default (we drop it first, for reasons of precaution)
if(!empty($matches[3])) {
$alterCol .= ",\nALTER COLUMN \"$colName\" DROP DEFAULT";
$alterCol .= ",\nALTER COLUMN \"$colName\" SET $matches[3]";
}
// SET check constraint (The constraint HAS to be dropped)
if(!empty($matches[4])) {
$existing_constraint=$this->query("SELECT conname FROM pg_constraint WHERE conname='{$tableName}_{$colName}_check';")->value();
//If you run into constraint conflicts, here's how to reset it:
//alter table "SiteTree" drop constraint "SiteTree_ClassName_check";
//update "SiteTree" set "ClassName"='NewValue' WHERE "ClassName"='OldValue';
//Repeat this for _Live and for _versions
if($existing_constraint){
$alterCol .= ",\nDROP CONSTRAINT \"{$tableName}_{$colName}_check\"";
}
$alterCol .= ",\nADD CONSTRAINT \"{$tableName}_{$colName}_check\" $matches[4]";
}
}
return isset($alterCol) ? $alterCol : '';
}
public function renameTable($oldTableName, $newTableName) {
$this->query("ALTER TABLE \"$oldTableName\" RENAME \"$newTableName\"");
}
/**
* Repairs and reindexes the table. This might take a long time on a very large table.
* @var string $tableName The name of the table.
* @return boolean Return true if the table has integrity after the method is complete.
*/
public function checkAndRepairTable($tableName) {
$this->runTableCheckCommand("VACUUM FULL ANALYZE \"$tableName\"");
$this->runTableCheckCommand("REINDEX TABLE \"$tableName\"");
return true;
}
/**
* Helper function used by checkAndRepairTable.
* @param string $sql Query to run.
* @return boolean Returns true no matter what; we're not currently checking the status of the command
*/
protected function runTableCheckCommand($sql) {
$testResults = $this->query($sql);
return true;
}
public function createField($tableName, $fieldName, $fieldSpec) {
$this->query("ALTER TABLE \"$tableName\" ADD \"$fieldName\" $fieldSpec");
}
/**
* Change the database type of the given field.
* @param string $tableName The name of the tbale the field is in.
* @param string $fieldName The name of the field to change.
* @param string $fieldSpec The new field specification
*/
public function alterField($tableName, $fieldName, $fieldSpec) {
$this->query("ALTER TABLE \"$tableName\" CHANGE \"$fieldName\" \"$fieldName\" $fieldSpec");
}
/**
* Change the database column name of the given field.
*
* @param string $tableName The name of the tbale the field is in.
* @param string $oldName The name of the field to change.
* @param string $newName The new name of the field
*/
public function renameField($tableName, $oldName, $newName) {
$fieldList = $this->fieldList($tableName);
if(array_key_exists($oldName, $fieldList)) {
$this->query("ALTER TABLE \"$tableName\" RENAME COLUMN \"$oldName\" TO \"$newName\"");
}
}
public function fieldList($table) {
//Query from http://www.alberton.info/postgresql_meta_info.html
//This gets us more information than we need, but I've included it all for the moment....
$fields = $this->query("SELECT ordinal_position, column_name, data_type, column_default, is_nullable, character_maximum_length, numeric_precision FROM information_schema.columns WHERE table_name = '$table' ORDER BY ordinal_position;");
$output = array();
if($fields) foreach($fields as $field) {
switch($field['data_type']){
case 'character varying':
//Check to see if there's a constraint attached to this column:
//$constraint=$this->query("SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='" . $table . '_' . $field['column_name'] . "_check' ORDER BY 1;")->first();
$constraint=$this->constraintExists($table . '_' . $field['column_name'] . '_check');
$enum='';
if($constraint){
//Now we need to break this constraint text into bits so we can see what we have:
//Examples:
//CHECK ("CanEditType"::text = ANY (ARRAY['LoggedInUsers'::character varying, 'OnlyTheseUsers'::character varying, 'Inherit'::character varying]::text[]))
//CHECK ("ClassName"::text = 'PageComment'::text)
//TODO: replace all this with a regular expression!
$value=$constraint['pg_get_constraintdef'];
$value=substr($value, strpos($value,'='));
$value=str_replace("''", "'", $value);
$in_value=false;
$constraints=Array();
$current_value='';
for($i=0; $i<strlen($value); $i++){
$char=substr($value, $i, 1);
if($in_value)
$current_value.=$char;
if($char=="'"){
if(!$in_value)
$in_value=true;
else {
$in_value=false;
$constraints[]=substr($current_value, 0, -1);
$current_value='';
}
}
}
if(sizeof($constraints)>0){
//Get the default:
$default=trim(substr($field['column_default'], 0, strpos($field['column_default'], '::')), "'");
$output[$field['column_name']]=$this->enum(Array('default'=>$default, 'name'=>$field['column_name'], 'enums'=>$constraints));
}
} else{
$output[$field['column_name']]='varchar(' . $field['character_maximum_length'] . ')';
}
break;
case 'numeric':
$output[$field['column_name']]='numeric(' . $field['numeric_precision'] . ')';
break;
case 'integer':
$output[$field['column_name']]='integer default ' . $field['column_default'];
break;
case 'timestamp without time zone':
$output[$field['column_name']]='timestamp';
break;
case 'smallint':
$output[$field['column_name']]='smallint default ' . $field['column_default'];
break;
default:
$output[$field['column_name']] = $field;
}
}
return $output;
}
/**
* Create an index on a table.
* @param string $tableName The name of the table.
* @param string $indexName The name of the index.
* @param string $indexSpec The specification of the index, see Database::requireIndex() for more details.
*/
public function createIndex($tableName, $indexName, $indexSpec) {
$this->query($this->getIndexSqlDefinition($tableName, $indexName, $indexSpec));
}
/*
* This takes the index spec which has been provided by a class (ie static $indexes = blah blah)
* and turns it into a proper string.
* Some indexes may be arrays, such as fulltext and unique indexes, and this allows database-specific
* arrays to be created.
*/
public function convertIndexSpec($indexSpec, $asDbValue=false, $table=''){
if(!$asDbValue){
if(is_array($indexSpec)){
//Here we create a db-specific version of whatever index we need to create.
switch($indexSpec['type']){
case 'fulltext':
$indexSpec='(ts_' . $indexSpec['name'] . ')';
break;
case 'unique':
$indexSpec='unique (' . $indexSpec['value'] . ')';
break;
case 'btree':
$indexSpec='using btree (' . $indexSpec['value'] . ')';
break;
case 'hash':
$indexSpec='using hash (' . $indexSpec['value'] . ')';
break;
}
}
} else {
$indexSpec='ix_' . $table . '_' . $indexSpec;
}
return $indexSpec;
}
protected function getIndexSqlDefinition($tableName, $indexName, $indexSpec, $asDbValue=false) {
//TODO: create table partition support
//TODO: create clustering options
if(!$asDbValue){
$tableCol= 'ix_' . $tableName . '_' . $indexName;
if(strlen($tableCol)>64){
$tableCol=substr($indexName, 0, 59) . rand(1000, 9999);
}
//It is possible to specify indexes through strings:
if(!is_array($indexSpec)){
$indexSpec=trim($indexSpec, '()');
$bits=explode(',', $indexSpec);
$indexes="\"" . implode("\",\"", $bits) . "\"";
$indexSpec=$this->indexList($tableName);
return "create index $tableCol ON \"" . $tableName . "\" (" . $indexes . ");";
} else {
//Arrays offer much more flexibility and many more options:
//Misc options first:
$fillfactor=$where='';
if(isset($indexSpec['fillfactor']))
$fillfactor='WITH (FILLFACTOR = ' . $indexSpec['fillfactor'] . ')';
if(isset($indexSpec['where']))
$where='WHERE ' . $indexSpec['where'];
//create a type-specific index
//NOTE: hash should be removed. This is only here to demonstrate how other indexes can be made
switch($indexSpec['type']){
case 'fulltext':
$spec="create index $tableCol ON \"" . $tableName . "\" USING " . $this->default_fts_cluster_method . "(\"ts_" . $indexName . "\") $fillfactor $where";
break;
case 'unique':
$spec="create unique index $tableCol ON \"" . $tableName . "\" (\"" . $indexSpec['value'] . "\") $fillfactor $where";
break;
case 'btree':
$spec="create index $tableCol ON \"" . $tableName . "\" USING btree (\"" . $indexSpec['value'] . "\") $fillfactor $where";
break;
case 'hash':
//NOTE: this is not a recommended index type
$spec="create index $tableCol ON \"" . $tableName . "\" USING hash (\"" . $indexSpec['value'] . "\") $fillfactor $where";
break;
case 'index':
//'index' is the same as default, just a normal index with the default type decided by the database.
default:
$spec="create index $tableCol ON \"" . $tableName . "\" (\"" . $indexSpec['value'] . "\") $fillfactor $where";
}
return trim($spec) . ';';
}
} else {
$indexName=trim($indexName, '()');
return $indexName;
}
}
function getDbSqlDefinition($tableName, $indexName, $indexSpec){
return $this->getIndexSqlDefinition($tableName, $indexName, $indexSpec, true);
}
/**
* Alter an index on a table.
* @param string $tableName The name of the table.
* @param string $indexName The name of the index.
* @param string $indexSpec The specification of the index, see Database::requireIndex() for more details.
*/
public function alterIndex($tableName, $indexName, $indexSpec) {
$indexSpec = trim($indexSpec);
if($indexSpec[0] != '(') {
list($indexType, $indexFields) = explode(' ',$indexSpec,2);
} else {
$indexFields = $indexSpec;
}
if(!$indexType) {
$indexType = "index";
}
$this->query("DROP INDEX $indexName");
$this->query("ALTER TABLE \"$tableName\" ADD $indexType \"$indexName\" $indexFields");
}
/**
* Return the list of indexes in a table.
* @param string $table The table name.
* @return array
*/
public function indexList($table) {
//Retrieve a list of indexes for the specified table
$indexes=DB::query("SELECT tablename, indexname, indexdef FROM pg_indexes WHERE tablename='$table';");
$indexList=Array();
foreach($indexes as $index) {
//We don't actually need the entire created command, just a few bits:
$prefix='';
//Check for uniques:
if(substr($index['indexdef'], 0, 13)=='CREATE UNIQUE')
$prefix='unique ';
//check for hashes, btrees etc:
if(strpos(strtolower($index['indexdef']), 'using hash ')!==false)
$prefix='using hash ';
//TODO: Fix me: btree is the default index type:
//if(strpos(strtolower($index['indexdef']), 'using btree ')!==false)
// $prefix='using btree ';
if(strpos(strtolower($index['indexdef']), 'using rtree ')!==false)
$prefix='using rtree ';
$value=explode(' ', substr($index['indexdef'], strpos($index['indexdef'], ' USING ')+7));
if(sizeof($value)>2){
for($i=2; $i<sizeof($value); $i++)
$value[1].=$value[$i];
}
$key=substr($value[1], 0, strpos($value[1], ')'));
$key=trim(trim(str_replace("\"", '', $key), '()'));
$indexList[$key]['indexname']=$index['indexname'];
$indexList[$key]['spec']=$prefix . '(' . $key . ')';
}
return isset($indexList) ? $indexList : null;
}
/**
* Returns a list of all the tables in the database.
* Table names will all be in lowercase.
* @return array
*/
public function tableList() {
foreach($this->query("SELECT tablename FROM pg_tables WHERE tablename NOT ILIKE 'pg_%' AND tablename NOT ILIKE 'sql_%'") as $record) {
//$table = strtolower(reset($record));
$table = reset($record);
$tables[$table] = $table;
}
//Return an empty array if there's nothing in this database
return isset($tables) ? $tables : Array();
}
function TableExists($tableName){
$result=$this->query("SELECT tablename FROM pg_tables WHERE tablename='$tableName';")->first();
if($result)
return true;
else
return false;
}
function constraintExists($constraint){
$exists=DB::query("SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='$constraint' ORDER BY 1;")->first();
//echo "SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='$constraint' ORDER BY 1;<Br>";
return $exists;
}
/**
* Return the number of rows affected by the previous operation.
* @return int
*/
public function affectedRows() {
return pg_affected_rows(DB::$lastQuery);
}
/**
* A function to return the field names and datatypes for the particular table
*/
public function tableDetails($tableName){
$query="SELECT a.attname as \"Column\", pg_catalog.format_type(a.atttypid, a.atttypmod) as \"Datatype\" FROM pg_catalog.pg_attribute a WHERE a.attnum > 0 AND NOT a.attisdropped AND a.attrelid = ( SELECT c.oid FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relname ~ '^($tableName)$' AND pg_catalog.pg_table_is_visible(c.oid));";
$result=DB::query($query);
$table=Array();
while($row=pg_fetch_assoc($result)){
$table[]=Array('Column'=>$row['Column'], 'DataType'=>$row['DataType']);
}
return $table;
}
/**
* Pass a legit trigger name and it will be dropped
* This assumes that the trigger has been named in a unique fashion
*/
function dropTrigger($triggerName, $tableName){
$exists=DB::query("SELECT tgname FROM pg_trigger WHERE tgname='$triggerName';")->first();
if($exists){
DB::query("DROP trigger $triggerName ON \"$tableName\";");
}
}
/**
* Return a boolean type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function boolean($values, $asDbValue=false){
//Annoyingly, we need to do a good ol' fashioned switch here:
($values['default']) ? $default='1' : $default='0';
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'smallint');
else {
if($values['arrayValue']!='')
$default='';
else
$default=' default ' . (int)$values['default'];
return "smallint{$values['arrayValue']}" . $default;
}
}
/**
* Return a date type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function date($values){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
return "date{$values['arrayValue']}";
}
/**
* Return a decimal type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function decimal($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
// Avoid empty strings being put in the db
if($values['precision'] == '') {
$precision = 1;
} else {
$precision = $values['precision'];
}
if($asDbValue)
return Array('data_type'=>'numeric', 'precision'=>'9');
else return "decimal($precision){$values['arrayValue']}";
}
/**
* Return a enum type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function enum($values){
//Enums are a bit different. We'll be creating a varchar(255) with a constraint of all the usual enum options.
//NOTE: In this one instance, we are including the table name in the values array
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($values['arrayValue']!='')
$default='';
else
$default=" default '{$values['default']}'";
return "varchar(255){$values['arrayValue']}" . $default . " check (\"" . $values['name'] . "\" in ('" . implode('\', \'', $values['enums']) . "'))";
}
/**
* Return a float type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function float($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'double precision');
else return "float{$values['arrayValue']}";
}
/**
* Return a float type-formatted string cause double is not supported
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function double($values, $asDbValue=false){
return $this->float($values, $asDbValue);
}
/**
* Return a int type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function int($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'integer', 'precision'=>'32');
else {
if($values['arrayValue']!='')
$default='';
else
$default=' default ' . (int)$values['default'];
return "integer{$values['arrayValue']}" . $default;
}
}
/**
* Return a datetime type-formatted string
* For PostgreSQL, we simply return the word 'timestamp', no other parameters are necessary
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function SS_Datetime($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'timestamp without time zone');
else
return "timestamp{$values['arrayValue']}";
}
/**
* Return a text type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function text($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'text');
else
return "text{$values['arrayValue']}";
}
/**
* Return a time type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function time($values){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
return "time{$values['arrayValue']}";
}
/**
* Return a varchar type-formatted string
*
* @params array $values Contains a tokenised list of info about this data type
* @return string
*/
public function varchar($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if(!isset($values['precision']))
$values['precision']=255;
if($asDbValue)
return Array('data_type'=>'varchar', 'precision'=>$values['precision']);
else
return "varchar({$values['precision']}){$values['arrayValue']}";
}
/*
* Return a 4 digit numeric type. MySQL has a proprietary 'Year' type.
* For Postgres, we'll use a 4 digit numeric
*/
public function year($values, $asDbValue=false){
if(!isset($values['arrayValue']))
$values['arrayValue']='';
if($asDbValue)
return Array('data_type'=>'numeric', 'precision'=>'4');
else return "numeric(4){$values['arrayValue']}";
}
function escape_character($escape=false){
if($escape)
return "\\\"";
else
return "\"";
}
/**
* Create a fulltext search datatype for PostgreSQL
* This will also return a trigger to be applied to this table
*
* @todo: create custom functions to allow weighted searches
*
* @param array $spec
*/
function fulltext($this_index, $tableName, $name){
//For full text search, we need to create a column for the index
$columns=explode(',', $this_index['value']);
for($i=0; $i<sizeof($columns);$i++)
$columns[$i]="\"" . trim($columns[$i]) . "\"";
$columns=implode(', ', $columns);
$fulltexts="\"ts_$name\" tsvector, ";
$triggerName="ts_{$tableName}_{$name}";
$this->dropTrigger($triggerName, $tableName);
$triggers="CREATE TRIGGER $triggerName BEFORE INSERT OR UPDATE
ON \"$tableName\" FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger(\"ts_$name\", 'pg_catalog.english', $columns);";
return Array('fulltexts'=>$fulltexts, 'triggers'=>$triggers);
}
/**
* This returns the column which is the primary key for each table
* In Postgres, it is a SERIAL8, which is the equivalent of an auto_increment
*
* @return string
*/
function IdColumn($asDbValue=false){
if($asDbValue)
return 'bigint';
else return 'serial8 not null';
}
/**
* Returns true if this table exists
* @todo Make a proper implementation
*/
function hasTable($tableName) {
return true;
}
/**
* Returns the SQL command to get all the tables in this database
*/
function allTablesSQL(){
return "SELECT table_name FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE';";
}
/**
* Return enum values for the given field
* @todo Make a proper implementation
*/
function enumValuesForField($tableName, $fieldName) {
//return array('SiteTree','Page');
$constraints=$this->constraintExists("{$tableName}_{$fieldName}_check");
$classes=Array();
if($constraints)
$classes=$this->EnumValuesFromConstraint($constraints['pg_get_constraintdef']);
return $classes;
}
/**
* Get the actual enum fields from the constraint value:
*/
private function EnumValuesFromConstraint($constraint){
$constraint=substr($constraint, strpos($constraint, 'ANY (ARRAY[')+11);
$constraint=substr($constraint, 0, -11);
$constraints=Array();
$segments=explode(',', $constraint);
foreach($segments as $this_segment){
$bits=preg_split('/ *:: */', $this_segment);
array_unshift($constraints, trim($bits[0], " '"));
}
return $constraints;
}
/**
* Because NOW() doesn't always work...
* MSSQL, I'm looking at you
*
*/
function now(){
return 'NOW()';
}
/*
* Returns the database-specific version of the random() function
*/
function random(){
return 'RANDOM()';
}
/*
* This is a lookup table for data types.
* For instance, Postgres uses 'INT', while MySQL uses 'UNSIGNED'
* So this is a DB-specific list of equivilents.
*/
function dbDataType($type){
$values=Array(
'unsigned integer'=>'INT'
);
if(isset($values[$type]))
return $values[$type];
else return '';
}
/**
* Convert a SQLQuery object into a SQL statement
* @todo There is a lot of duplication between this and MySQLDatabase::sqlQueryToString(). Perhaps they could both call a common
* helper function in Database?
*/
public function sqlQueryToString(SQLQuery $sqlQuery) {
if (!$sqlQuery->from) return '';
$distinct = $sqlQuery->distinct ? "DISTINCT " : "";
if($sqlQuery->delete) {
$text = "DELETE ";
} else if($sqlQuery->select) {
$text = "SELECT $distinct" . implode(", ", $sqlQuery->select);
}
$text .= " FROM " . implode(" ", $sqlQuery->from);
if($sqlQuery->where) $text .= " WHERE (" . $sqlQuery->getFilter(). ")";
if($sqlQuery->groupby) $text .= " GROUP BY " . implode(", ", $sqlQuery->groupby);
if($sqlQuery->having) $text .= " HAVING ( " . implode(" ) AND ( ", $sqlQuery->having) . " )";
if($sqlQuery->orderby) $text .= " ORDER BY " . $this->orderMoreSpecifically($sqlQuery->select,$sqlQuery->orderby);
if($sqlQuery->limit) {
$limit = $sqlQuery->limit;
// Pass limit as array or SQL string value
if(is_array($limit)) {
if(isset($limit['start']) && $limit['start']!='')
$text.=' OFFSET ' . $limit['start'];
if(isset($limit['limit']) && $limit['limit']!='')
$text.=' LIMIT ' . $limit['limit'];
} else {
if(strpos($sqlQuery->limit, ',')){
$limit=str_replace(',', ' LIMIT ', $sqlQuery->limit);
$text .= ' OFFSET ' . $limit;
} else {
$text.=' LIMIT ' . $sqlQuery->limit;
}
}
}
return $text;
}
protected function orderMoreSpecifically($select,$order) {
$altered = false;
// split expression into order terms
$terms = explode(',', $order);
foreach($terms as $i => $term) {
$term = trim($term);
// check if table is unspecified
if(!preg_match('/\./', $term)) {
$direction = '';
if(preg_match('/( ASC)$|( DESC)$/i',$term)) list($term,$direction) = explode(' ', $term);
// find a match in the SELECT array and replace
foreach($select as $s) {
if(preg_match('/"[a-z0-9_]+"\.[\'"]' . $term . '[\'"]/i', trim($s))) {
$terms[$i] = $s . ' ' . $direction;
$altered = true;
break;
}
}
}
}
return implode(',', $terms);
}
/*
* This will return text which has been escaped in a database-friendly manner
* Using PHP's addslashes method won't work in MSSQL
*/
function addslashes($value){
return pg_escape_string($value);
}
/*
* This changes the index name depending on database requirements.
*/
function modifyIndex($index, $spec){
if(is_array($spec) && $spec['type']=='fulltext')
return 'ts_' . str_replace(',', '_', $index);
else
return str_replace('_', ',', $index);
}
/**
* The core search engine configuration.
* @todo Properly extract the search functions out of the core.
*
* @param string $keywords Keywords as a space separated string
* @return object DataObjectSet of result pages
*/
public function searchEngine($classesToSearch, $keywords, $start, $pageLength, $sortBy = "ts_rank DESC", $extraFilter = "", $booleanSearch = false, $alternativeFileFilter = "", $invertedMatch = false) {
$keywords = Convert::raw2sql(trim($keywords));
$htmlEntityKeywords = htmlentities($keywords);
//We can get a list of all the tsvector columns though this query:
//We know what tables to search in based on the $classesToSearch variable:
$result=DB::query("SELECT table_name, column_name, data_type FROM information_schema.columns WHERE data_type='tsvector' AND table_name in ('" . implode("', '", $classesToSearch) . "');");
if (!$result->numRecords()) throw Exception('there are no full text columns to search');
$tables=Array();
// Make column selection lists
$select = array(
'SiteTree' => array("\"ClassName\"","\"SiteTree\".\"ID\"","\"ParentID\"","\"Title\"","\"URLSegment\"","\"Content\"","\"LastEdited\"","\"Created\"","NULL AS \"Filename\"", "NULL AS \"Name\"", "\"CanViewType\""),
'File' => array("\"ClassName\"","\"File\".\"ID\"","NULL AS \"ParentID\"","\"Title\"","NULL AS \"URLSegment\"","\"Content\"","\"LastEdited\"","\"Created\"","\"Filename\"","\"Name\"", "NULL AS \"CanViewType\""),
);
foreach($result as $row){
if($row['table_name']=='SiteTree')
$showInSearch="AND \"ShowInSearch\"=1 ";
else
$showInSearch='';
//public function extendedSQL($filter = "", $sort = "", $limit = "", $join = "", $having = ""){
$query=singleton($row['table_name'])->extendedSql("\"" . $row['column_name'] . "\" " . $this->default_fts_search_method . ' q ' . $showInSearch, '');
$query->select=$select[$row['table_name']];
$query->from['tsearch']=", to_tsquery('english', '$keywords') AS q";
$query->select[]="ts_rank(\"{$row['column_name']}\", q) AS Relevance";
$query->orderby=null;
//Add this query to the collection
$tables[] = $query->sql();
}
$doSet=new DataObjectSet();
$limit=$pageLength;
$offset=$start;
if($keywords)
$orderBy=" ORDER BY $sortBy";
else $orderBy='';
$fullQuery = "SELECT * FROM (" . implode(" UNION ", $tables) . ") AS q1 $orderBy LIMIT $limit OFFSET $offset";
// Get records
$records = DB::query($fullQuery);
$totalCount=0;
foreach($records as $record){
$objects[] = new $record['ClassName']($record);
$totalCount++;
}
if(isset($objects)) $doSet = new DataObjectSet($objects);
else $doSet = new DataObjectSet();
$doSet->setPageLimits($start, $pageLength, $totalCount);
return $doSet;
}
/*
* Does this database support transactions?
*/
public function supportsTransactions(){
return $this->supportsTransactions;
}
/*
* This is a quick lookup to discover if the database supports particular extensions
*/
public function supportsExtensions($extensions=Array('partitions', 'tablespaces', 'clustering')){
if(isset($extensions['partitions']))
return true;
elseif(isset($extensions['tablespaces']))
return true;
elseif(isset($extensions['clustering']))
return true;
else
return false;
}
/*
* Start a prepared transaction
* See http://developer.postgresql.org/pgdocs/postgres/sql-set-transaction.html for details on transaction isolation options
*/
public function startTransaction($transaction_mode=false, $session_characteristics=false){
DB::query('BEGIN;');
if($transaction_mode)
DB::query('SET TRANSACTION ' . $transaction_mode . ';');
if($session_characteristics)
DB::query('SET SESSION CHARACTERISTICS AS TRANSACTION ' . $session_characteristics . ';');
}
/*
* Create a savepoint that you can jump back to if you encounter problems
*/
public function transactionSavepoint($savepoint){
DB::query("SAVEPOINT $savepoint;");
}
/*
* Rollback or revert to a savepoint if your queries encounter problems
* If you encounter a problem at any point during a transaction, you may
* need to rollback that particular query, or return to a savepoint
*/
public function transactionRollback($savepoint=false){
if($savepoint)
DB::query("ROLLBACK TO $savepoint;");
else
DB::query('ROLLBACK;');
}
/*
* Commit everything inside this transaction so far
*/
public function endTransaction(){
DB::query('COMMIT;');
}
/*
* Given a tablespace and and location, either create a new one
* or update the existing one
*/
public function createOrReplaceTablespace($name, $location){
$existing=DB::query("SELECT spcname, spclocation FROM pg_tablespace WHERE spcname='$name';")->first();
//NOTE: this location must be empty for this to work
//We can't seem to change the location of the tablespace through any ALTER commands :(
//If a tablespace with this name exists, but the location has changed, then drop the current one
//if($existing && $location!=$existing['spclocation'])
// DB::query("DROP TABLESPACE $name;");
//If this is a new tablespace, or we have dropped the current one:
if(!$existing || ($existing && $location!=$existing['spclocation']))
DB::query("CREATE TABLESPACE $name LOCATION '$location';");
}
public function createOrReplacePartition($tableName, $partitions, $indexes, $extensions){
//We need the plpgsql language to be installed for this to work:
$this->createLanguage('plpgsql');
$trigger='CREATE OR REPLACE FUNCTION ' . $tableName . '_insert_trigger() RETURNS TRIGGER AS $$ BEGIN ';
$first=true;
//Do we need to create a tablespace for this item?
if($extensions && isset($extensions['tablespace'])){
$this->createOrReplaceTablespace($extensions['tablespace']['name'], $extensions['tablespace']['location']);
$tableSpace=' TABLESPACE ' . $extensions['tablespace']['name'];
} else
$tableSpace='';
foreach($partitions as $partition_name=>$partition_value){
//Check that this child table does not already exist:
if(!$this->TableExists($partition_name)){
DB::query("CREATE TABLE \"$partition_name\" (CHECK (" . str_replace('NEW.', '', $partition_value) . ")) INHERITS (\"$tableName\")$tableSpace;");
} else {
//Drop the constraint, we will recreate in in the next line
$existing_constraint=$this->query("SELECT conname FROM pg_constraint WHERE conname='{$partition_name}_pkey';");
if($existing_constraint){
DB::query("ALTER TABLE \"$partition_name\" DROP CONSTRAINT \"{$partition_name}_pkey\";");
}
$this->dropTrigger(strtolower('trigger_' . $tableName . '_insert'), $tableName);
}
DB::query("ALTER TABLE \"$partition_name\" ADD CONSTRAINT \"{$partition_name}_pkey\" PRIMARY KEY (\"ID\");");
if($first){
$trigger.='IF';
$first=false;
} else
$trigger.='ELSIF';
$trigger.=" ($partition_value) THEN INSERT INTO \"$partition_name\" VALUES (NEW.*);";
if($indexes){
// We need to propogate the indexes through to the child pages.
// Some of this code is duplicated, and could be tidied up
foreach($indexes as $name=>$this_index){
if($this_index['type']=='fulltext'){
$fillfactor=$where='';
if(isset($this_index['fillfactor']))
$fillfactor='WITH (FILLFACTOR = ' . $this_index['fillfactor'] . ')';
if(isset($this_index['where']))
$where='WHERE ' . $this_index['where'];
DB::query("CREATE INDEX \"ix_{$partition_name}_{$this_index['name']}\" ON \"" . $partition_name . "\" USING " . $this->default_fts_cluster_method . "(\"ts_" . $name . "\") $fillfactor $where");
$ts_details=$this->fulltext($this_index, $partition_name, $name);
DB::query($ts_details['triggers']);
} else {
if(is_array($this_index))
$index_name=$this_index['name'];
else $index_name=trim($this_index, '()');
$query=$this->getIndexSqlDefinition($partition_name, $index_name, $this_index);
DB::query($query);
}
}
}
//Lastly, clustering goes here:
if($extensions && isset($extensions['cluster'])){
DB::query("CLUSTER \"$partition_name\" USING \"{$extensions['cluster']}\";");
}
}
$trigger.='ELSE RAISE EXCEPTION \'Value id out of range. Fix the ' . $tableName . '_insert_trigger() function!\'; END IF; RETURN NULL; END; $$ LANGUAGE plpgsql;';
$trigger.='CREATE TRIGGER trigger_' . $tableName . '_insert BEFORE INSERT ON "' . $tableName . '" FOR EACH ROW EXECUTE PROCEDURE ' . $tableName . '_insert_trigger();';
DB::query($trigger);
}
/*
* This will create a language if it doesn't already exist.
* This is used by the createOrReplacePartition function, which needs plpgsql
*/
public function createLanguage($language){
$result=DB::query("SELECT lanname FROM pg_language WHERE lanname='$language';")->first();
if(!$result){
DB::query("CREATE LANGUAGE $language;");
}
}
/**
* Function to return an SQL datetime expression that can be used with Postgres
* used for querying a datetime in a certain format
* @param string $date to be formated, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $format to be used, supported specifiers:
* %Y = Year (four digits)
* %m = Month (01..12)
* %d = Day (01..31)
* %H = Hour (00..23)
* %i = Minutes (00..59)
* %s = Seconds (00..59)
* %U = unix timestamp, can only be used on it's own
* @return string SQL datetime expression to query for a formatted datetime
*/
function formattedDatetimeClause($date, $format) {
preg_match_all('/%(.)/', $format, $matches);
foreach($matches[1] as $match) if(array_search($match, array('Y','m','d','H','i','s','U')) === false) user_error('formattedDatetimeClause(): unsupported format character %' . $match, E_USER_WARNING);
$translate = array(
'/%Y/' => 'YYYY',
'/%m/' => 'MM',
'/%d/' => 'DD',
'/%H/' => 'HH24',
'/%i/' => 'MI',
'/%s/' => 'SS',
);
$format = preg_replace(array_keys($translate), array_values($translate), $format);
if(preg_match('/^now$/i', $date)) {
$date = "NOW()";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "TIMESTAMP '$date'";
}
if($format == '%U') return "FLOOR(EXTRACT(epoch FROM $date))";
return "to_char($date, TEXT '$format')";
}
/**
* Function to return an SQL datetime expression that can be used with Postgres
* used for querying a datetime addition
* @param string $date, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $interval to be added, use the format [sign][integer] [qualifier], e.g. -1 Day, +15 minutes, +1 YEAR
* supported qualifiers:
* - years
* - months
* - days
* - hours
* - minutes
* - seconds
* This includes the singular forms as well
* @return string SQL datetime expression to query for a datetime (YYYY-MM-DD hh:mm:ss) which is the result of the addition
*/
function datetimeIntervalClause($date, $interval) {
if(preg_match('/^now$/i', $date)) {
$date = "NOW()";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "TIMESTAMP '$date'";
}
// ... when being to precise becomes a pain. we need to cut of the fractions.
// TIMESTAMP(0) doesn't work because it rounds instead flooring
return "CAST(SUBSTRING(CAST($date + INTERVAL '$interval' AS VARCHAR) FROM 1 FOR 19) AS TIMESTAMP)";
}
/**
* Function to return an SQL datetime expression that can be used with Postgres
* used for querying a datetime substraction
* @param string $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $date2 to be substracted of $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @return string SQL datetime expression to query for the interval between $date1 and $date2 in seconds which is the result of the substraction
*/
function datetimeDifferenceClause($date1, $date2) {
if(preg_match('/^now$/i', $date1)) {
$date1 = "NOW()";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date1)) {
$date1 = "TIMESTAMP '$date1'";
}
if(preg_match('/^now$/i', $date2)) {
$date2 = "NOW()";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date2)) {
$date2 = "TIMESTAMP '$date2'";
}
return "(FLOOR(EXTRACT(epoch FROM $date1)) - FLOOR(EXTRACT(epoch from $date2)))";
}
}
/**
* A result-set from a PostgreSQL database.
* @package sapphire
* @subpackage model
*/
class PostgreSQLQuery extends SS_Query {
/**
* The MySQLDatabase object that created this result set.
* @var PostgreSQLDatabase
*/
private $database;
/**
* The internal Postgres handle that points to the result set.
* @var resource
*/
private $handle;
/**
* Hook the result-set given into a Query class, suitable for use by sapphire.
* @param database The database object that created this query.
* @param handle the internal Postgres handle that is points to the resultset.
*/
public function __construct(PostgreSQLDatabase $database, $handle) {
$this->database = $database;
$this->handle = $handle;
}
public function __destroy() {
pg_free_result($this->handle);
}
public function seek($row) {
return pg_result_seek($this-handle, $row);
}
public function numRecords() {
return pg_num_rows($this->handle);
}
public function nextRecord() {
// Coalesce rather than replace common fields.
if($data = pg_fetch_row($this->handle)) {
foreach($data as $columnIdx => $value) {
$columnName = pg_field_name($this->handle, $columnIdx);
// $value || !$ouput[$columnName] means that the *last* occurring value is shown
// !$ouput[$columnName] means that the *first* occurring value is shown
if(isset($value) || !isset($output[$columnName])) {
$output[$columnName] = $value;
}
}
return $output;
} else {
return false;
}
}
}
?>
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