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silverstripe-postgresql/code/PostgreSQLSchemaManager.php

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API Upgraded module to use new database ORM
2013-04-03 06:27:11 +02:00
<?php
/**
* PostgreSQL schema manager
*
* @package sapphire
* @subpackage model
*/
class PostgreSQLSchemaManager extends DBSchemaManager {
/**
* Identifier for this schema, used for configuring schema-specific table
* creation options
*/
const ID = 'PostgreSQL';
/**
* Instance of the database controller this schema belongs to
*
* @var PostgreSQLDatabase
*/
protected $database = null;
/**
* This holds a copy of all the constraint results that are returned
* via the function constraintExists(). This is a bit faster than
* repeatedly querying this column, and should allow the database
* to use it's built-in caching features for better queries.
*
* @var array
*/
protected static $cached_constraints = array();
/**
*
* This holds a copy of all the queries that run through the function fieldList()
* This is one of the most-often called functions, and repeats itself a great deal in the unit tests.
*
* @var array
*/
protected static $cached_fieldlists = array();
protected function indexKey($table, $index, $spec) {
return $this->buildPostgresIndexName($table, $index);
}
/**
* Creates a postgres database, ignoring model_schema_as_database
*
* @param string $name
*/
public function createPostgresDatabase($name) {
$this->query("CREATE DATABASE \"$name\";");
}
public function createDatabase($name) {
if(PostgreSQLDatabase::model_schema_as_database()) {
$schemaName = $this->database->databaseToSchemaName($name);
return $this->createSchema($schemaName);
}
return $this->createPostgresDatabase($name);
}
/**
* Determines if a postgres database exists, ignoring model_schema_as_database
*
* @param string $name
* @return boolean
*/
public function postgresDatabaseExists($name) {
$result = $this->preparedQuery("SELECT datname FROM pg_database WHERE datname = ?;", array($name));
return $result->first() ? true : false;
}
public function databaseExists($name) {
if(PostgreSQLDatabase::model_schema_as_database()) {
$schemaName = $this->database->databaseToSchemaName($name);
return $this->schemaExists($schemaName);
}
return $this->postgresDatabaseExists($name);
}
/**
* Determines the list of all postgres databases, ignoring model_schema_as_database
*
* @return array
*/
public function postgresDatabaseList() {
return $this->query("SELECT datname FROM pg_database WHERE datistemplate=false;")->column();
}
public function databaseList() {
if(PostgreSQLDatabase::model_schema_as_database()) {
$schemas = $this->schemaList();
$names = array();
foreach($schemas as $schema) {
$names[] = $this->database->schemaToDatabaseName($schema);
}
return array_unique($names);
}
return $this->postgresDatabaseList();
}
/**
* Drops a postgres database, ignoring model_schema_as_database
*
* @param string $name
*/
public function dropPostgresDatabase($name) {
$nameSQL = $this->database->escapeIdentifier($name);
$this->query("DROP DATABASE $nameSQL;");
}
public function dropDatabase($name) {
if(PostgreSQLDatabase::model_schema_as_database()) {
$schemaName = $this->database->databaseToSchemaName($name);
return $this->dropSchema($schemaName);
}
$this->dropPostgresDatabase($name);
}
/**
* Returns true if the schema exists in the current database
*
* @param string $name
* @return boolean
*/
public function schemaExists($name) {
return $this->preparedQuery(
"SELECT nspname FROM pg_catalog.pg_namespace WHERE nspname = ?;",
array($name)
)->first() ? true : false;
}
/**
* Creates a schema in the current database
*
* @param string $name
*/
public function createSchema($name) {
$nameSQL = $this->database->escapeIdentifier($name);
$this->query("CREATE SCHEMA $nameSQL;");
}
/**
* Drops a schema from the database. Use carefully!
*
* @param string $name
*/
public function dropSchema($name) {
$nameSQL = $this->database->escapeIdentifier($name);
$this->query("DROP SCHEMA $nameSQL CASCADE;");
}
/**
* Returns the list of all available schemas on the current database
*
* @return array
*/
public function schemaList() {
return $this->query("
SELECT nspname
FROM pg_catalog.pg_namespace
WHERE nspname <> 'information_schema' AND nspname !~ E'^pg_'"
)->column();
}
public function createTable($table, $fields = null, $indexes = null, $options = null, $advancedOptions = null) {
$fieldSchemas = $indexSchemas = "";
if($fields) foreach($fields as $k => $v) {
$fieldSchemas .= "\"$k\" $v,\n";
}
if(!empty($options[self::ID])) {
$addOptions = $options[self::ID];
} elseif (!empty($options[get_class($this)])) {
Deprecation::notice('3.2', 'Use PostgreSQLSchemaManager::ID for referencing postgres-specific table creation options');
$addOptions = $options[get_class($this)];
} else {
$addOptions = null;
}
//First of all, does this table already exist
$doesExist = $this->hasTable($table);
if($doesExist) {
// Table already exists, just return the name, in line with baseclass documentation.
return $table;
}
//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 => $this_index){
if(is_array($this_index) && $this_index['type'] == 'fulltext') {
$ts_details = $this->fulltext($this_index, $table, $name);
$fulltexts .= $ts_details['fulltexts'] . ', ';
$triggers .= $ts_details['triggers'];
}
}
}
if($indexes) foreach($indexes as $k => $v) {
$indexSchemas .= $this->getIndexSqlDefinition($table, $k, $v) . "\n";
}
//Do we need to create a tablespace for this item?
if($advancedOptions && isset($advancedOptions['tablespace'])){
$this->createOrReplaceTablespace(
$advancedOptions['tablespace']['name'],
$advancedOptions['tablespace']['location']
);
$tableSpace = ' TABLESPACE ' . $advancedOptions['tablespace']['name'];
} else
$tableSpace = '';
$this->query("CREATE TABLE \"$table\" (
$fieldSchemas
$fulltexts
primary key (\"ID\")
)$tableSpace; $indexSchemas $addOptions");
if($triggers!=''){
$this->query($triggers);
}
//If we have a partitioning requirement, we do that here:
if($advancedOptions && isset($advancedOptions['partitions'])){
$this->createOrReplacePartition($table, $advancedOptions['partitions'], $indexes, $advancedOptions);
}
//Lastly, clustering goes here:
if($advancedOptions && isset($advancedOptions['cluster'])){
$this->query("CLUSTER \"$table\" USING \"{$advancedOptions['cluster']}\";");
}
return $table;
}
/**
* Builds the internal Postgres index name given the silverstripe table and index name
*
* @param string $tableName
* @param string $indexName
* @param string $prefix The optional prefix for the index. Defaults to "ix" for indexes.
* @return string The postgres name of the index
*/
protected function buildPostgresIndexName($tableName, $indexName, $prefix = 'ix') {
// Assume all indexes also contain the table name
// MD5 the table/index name combo to keep it to a fixed length.
// Exclude the prefix so that the trigger name can be easily generated from the index name
$indexNamePG = "{$prefix}_" . md5("{$tableName}_{$indexName}");
// Limit to 63 characters
if (strlen($indexNamePG) > 63) {
return substr($indexNamePG, 0, 63);
} else {
return $indexNamePG;
}
}
/**
* Builds the internal Postgres trigger name given the silverstripe table and trigger name
*
* @param string $tableName
* @param string $triggerName
* @return string The postgres name of the trigger
*/
function buildPostgresTriggerName($tableName, $triggerName) {
// Kind of cheating, but behaves the same way as indexes
return $this->buildPostgresIndexName($tableName, $triggerName, 'ts');
}
public function alterTable($table, $newFields = null, $newIndexes = null, $alteredFields = null, $alteredIndexes = null, $alteredOptions = null, $advancedOptions = null) {
$alterList = array();
if($newFields) foreach($newFields as $fieldName => $fieldSpec) {
$alterList[] = "ADD \"$fieldName\" $fieldSpec";
}
if ($alteredFields) foreach ($alteredFields as $indexName => $indexSpec) {
$val = $this->alterTableAlterColumn($table, $indexName, $indexSpec);
if (!empty($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']);
$this->query("ALTER TABLE \"$table\" 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();
//Pick up the altered indexes here:
$fieldList = $this->fieldList($table);
$fulltexts = false;
$drop_triggers = false;
$triggers = false;
if($alteredIndexes) foreach($alteredIndexes as $indexName=>$indexSpec) {
$indexSpec = $this->parseIndexSpec($indexName, $indexSpec);
$indexNamePG = $this->buildPostgresIndexName($table, $indexName);
if($indexSpec['type']=='fulltext') {
//For full text indexes, we need to drop the trigger, drop the index, AND drop the column
//Go and get the tsearch details:
$ts_details = $this->fulltext($indexSpec, $table, $indexName);
//Drop this column if it already exists:
//No IF EXISTS option is available for Postgres <9.0
if(array_key_exists($ts_details['ts_name'], $fieldList)){
$fulltexts.="ALTER TABLE \"{$table}\" DROP COLUMN \"{$ts_details['ts_name']}\";";
}
// We'll execute these later:
$triggerNamePG = $this->buildPostgresTriggerName($table, $indexName);
$drop_triggers.= "DROP TRIGGER IF EXISTS \"$triggerNamePG\" ON \"$table\";";
$fulltexts .= "ALTER TABLE \"{$table}\" ADD COLUMN {$ts_details['fulltexts']};";
$triggers .= $ts_details['triggers'];
}
// Create index action (including fulltext)
$alterIndexList[] = "DROP INDEX IF EXISTS \"$indexNamePG\";";
$createIndex = $this->getIndexSqlDefinition($table, $indexName, $indexSpec);
if($createIndex!==false) $alterIndexList[] = $createIndex;
}
//Add the new indexes:
if($newIndexes) foreach($newIndexes as $indexName => $indexSpec){
$indexSpec = $this->parseIndexSpec($indexName, $indexSpec);
$indexNamePG = $this->buildPostgresIndexName($table, $indexName);
//If we have a fulltext search request, then we need to create a special column
//for GiST searches
//Pick up the new indexes here:
if($indexSpec['type']=='fulltext') {
$ts_details=$this->fulltext($indexSpec, $table, $indexName);
if(!isset($fieldList[$ts_details['ts_name']])){
$fulltexts.="ALTER TABLE \"{$table}\" ADD COLUMN {$ts_details['fulltexts']};";
$triggers.=$ts_details['triggers'];
}
}
//Check that this index doesn't already exist:
$indexes=$this->indexList($table);
if(isset($indexes[$indexName])){
$alterIndexList[] = "DROP INDEX IF EXISTS \"$indexNamePG\";";
}
$createIndex=$this->getIndexSqlDefinition($table, $indexName, $indexSpec);
if($createIndex!==false)
$alterIndexList[] = $createIndex;
}
if($alterList) {
$alterations = implode(",\n", $alterList);
$this->query("ALTER TABLE \"$table\" " . $alterations);
}
//Do we need to create a tablespace for this item?
if($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", $table, $alteredOptions[$this->class]));
Database::alteration_message(
sprintf("Table %s options changed: %s", $table, $alteredOptions[$this->class]),
"changed"
);
}
//Create any fulltext columns and triggers here:
if($fulltexts) $this->query($fulltexts);
if($drop_triggers) $this->query($drop_triggers);
if($triggers) {
$this->query($triggers);
$triggerbits=explode(';', $triggers);
foreach($triggerbits as $trigger){
$trigger_fields=$this->triggerFieldsFromTrigger($trigger);
if($trigger_fields){
//We need to run a simple query to force the database to update the triggered columns
$this->query("UPDATE \"{$table}\" SET \"{$trigger_fields[0]}\"=\"$trigger_fields[0]\";");
}
}
}
foreach($alterIndexList as $alteration) $this->query($alteration);
//If we have a partitioning requirement, we do that here:
if($advancedOptions && isset($advancedOptions['partitions'])){
$this->createOrReplacePartition($table, $advancedOptions['partitions']);
}
//Lastly, clustering goes here:
if ($advancedOptions && isset($advancedOptions['cluster'])) {
$clusterIndex = $this->buildPostgresIndexName($table, $advancedOptions['cluster']);
$this->query("CLUSTER \"$table\" USING \"$clusterIndex\";");
} 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 = $this->preparedQuery(
"SELECT relid FROM pg_stat_user_tables WHERE relname = ?;",
array($table)
)->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 = $this->preparedQuery("
SELECT c2.relname, i.indisclustered
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
WHERE c.oid = ? AND c.oid = i.indrelid AND i.indexrelid = c2.oid AND indisclustered='t';",
array($oid)
)->first();
if($clustered) {
$this->query("ALTER TABLE \"$table\" 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, $matches);
if(sizeof($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)
$existing_constraint=$this->query("SELECT conname FROM pg_constraint WHERE conname='{$tableName}_{$colName}_check';")->value();
if(isset($matches[4])) {
//Take this new constraint and see what's outstanding from the target table:
$constraint_bits=explode('(', $matches[4]);
$constraint_values=trim($constraint_bits[2], ')');
$constraint_values_bits=explode(',', $constraint_values);
$default=trim($constraint_values_bits[0], " '");
//Now go and convert anything that's not in this list to 'Page'
//We have to run this as a query, not as part of the alteration queries due to the way they are constructed.
$updateConstraint='';
$updateConstraint.="UPDATE \"{$tableName}\" SET \"$colName\"='$default' WHERE \"$colName\" NOT IN ($constraint_values);";
if($this->hasTable("{$tableName}_Live")) {
$updateConstraint.="UPDATE \"{$tableName}_Live\" SET \"$colName\"='$default' WHERE \"$colName\" NOT IN ($constraint_values);";
}
if($this->hasTable("{$tableName}_versions")) {
$updateConstraint.="UPDATE \"{$tableName}_versions\" SET \"$colName\"='$default' WHERE \"$colName\" NOT IN ($constraint_values);";
}
$this->query($updateConstraint);
}
//First, delete any existing constraint on this column, even if it's no longer an enum
if($existing_constraint) {
$alterCol .= ",\nDROP CONSTRAINT \"{$tableName}_{$colName}_check\"";
}
//Now create the constraint (if we've asked for one)
if(!empty($matches[4])) {
$alterCol .= ",\nADD CONSTRAINT \"{$tableName}_{$colName}_check\" $matches[4]";
}
}
return isset($alterCol) ? $alterCol : '';
}
public function renameTable($oldTableName, $newTableName) {
$this->query("ALTER TABLE \"$oldTableName\" RENAME TO \"$newTableName\"");
unset(self::$cached_fieldlists[$oldTableName]);
}
public function checkAndRepairTable($tableName) {
$this->query("VACUUM FULL ANALYZE \"$tableName\"");
$this->query("REINDEX TABLE \"$tableName\"");
return true;
}
public function createField($table, $field, $spec) {
$this->query("ALTER TABLE \"$table\" ADD \"$field\" $spec");
}
/**
* 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\" $fieldSpec");
}
public function renameField($tableName, $oldName, $newName) {
$fieldList = $this->fieldList($tableName);
if(array_key_exists($oldName, $fieldList)) {
$this->query("ALTER TABLE \"$tableName\" RENAME COLUMN \"$oldName\" TO \"$newName\"");
//Remove this from the cached list:
unset(self::$cached_fieldlists[$tableName]);
}
}
public function fieldList($table) {
//Query from http://www.alberton.info/postgresql_meta_info.html
//This gets us more information than we need, but I've included it all for the moment....
//if(!isset(self::$cached_fieldlists[$table])){
$fields = $this->preparedQuery("
SELECT ordinal_position, column_name, data_type, column_default,
is_nullable, character_maximum_length, numeric_precision, numeric_scale
FROM information_schema.columns WHERE table_name = ?
ORDER BY ordinal_position;",
array($table)
);
$output = array();
if($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 . '_' . $field['column_name'] . '_check');
if($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']]='decimal(' . $field['numeric_precision'] . ',' . $field['numeric_scale'] . ') default ' . (int)$field['column_default'];
break;
case 'integer':
$output[$field['column_name']]='integer default ' . (int)$field['column_default'];
break;
case 'timestamp without time zone':
$output[$field['column_name']]='timestamp';
break;
case 'smallint':
$output[$field['column_name']]='smallint default ' . (int)$field['column_default'];
break;
case 'time without time zone':
$output[$field['column_name']]='time';
break;
case 'double precision':
$output[$field['column_name']]='float';
break;
default:
$output[$field['column_name']] = $field;
}
}
// self::$cached_fieldlists[$table]=$output;
//}
//return self::$cached_fieldlists[$table];
return $output;
}
function clearCachedFieldlist($tableName=false){
if($tableName) unset(self::$cached_fieldlists[$tableName]);
else self::$cached_fieldlists=array();
return true;
}
/**
* 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) {
$createIndex = $this->getIndexSqlDefinition($tableName, $indexName, $indexSpec);
if($createIndex !== false) $this->query($createIndex);
}
/*
* @todo - factor out? Is DBSchemaManager::convertIndexSpec sufficient?
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='fulltext (' . $indexSpec['value'] . ')';
break;
case 'unique':
$indexSpec='unique (' . $indexSpec['value'] . ')';
break;
case 'hash':
$indexSpec='using hash (' . $indexSpec['value'] . ')';
break;
case 'index':
//The default index is 'btree', which we'll use by default (below):
default:
$indexSpec='using btree (' . $indexSpec['value'] . ')';
break;
}
}
} else {
$indexSpec = $this->buildPostgresIndexName($table, $indexSpec);
}
return $indexSpec;
}*/
protected function getIndexSqlDefinition($tableName, $indexName, $indexSpec, $asDbValue=false) {
//TODO: create table partition support
//TODO: create clustering options
//NOTE: it is possible for *_renamed tables to have indexes whose names are not updates
//Therefore, we now check for the existance of indexes before we create them.
//This is techically a bug, since new tables will not be indexed.
// If requesting the definition rather than the DDL
if($asDbValue) {
$indexName=trim($indexName, '()');
return $indexName;
}
// Determine index name
$tableCol = $this->buildPostgresIndexName($tableName, $indexName);
// Consolidate/Cleanup spec into array format
$indexSpec = $this->parseIndexSpec($indexName, $indexSpec);
//Misc options first:
$fillfactor = $where = '';
if (isset($indexSpec['fillfactor'])) {
$fillfactor = 'WITH (FILLFACTOR = ' . $indexSpec['fillfactor'] . ')';
}
if (isset($indexSpec['where'])) {
$where = 'WHERE ' . $indexSpec['where'];
}
//create a type-specific index
// NOTE: hash should be removed. This is only here to demonstrate how other indexes can be made
// NOTE: Quote the index name to preserve case sensitivity
switch ($indexSpec['type']) {
case 'fulltext':
// @see fulltext() for the definition of the trigger that ts_$IndexName uses for fulltext searching
$clusterMethod = PostgreSQLDatabase::default_fts_cluster_method();
$spec = "create index \"$tableCol\" ON \"$tableName\" USING $clusterMethod(\"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) . ';';
}
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");
}
/**
* Given a trigger name attempt to determine the columns upon which it acts
*
* @param string $triggerName Postgres trigger name
* @return array List of columns
*/
protected function extractTriggerColumns($triggerName)
{
$trigger = $this->preparedQuery(
"SELECT tgargs FROM pg_catalog.pg_trigger WHERE tgname = ?",
array($triggerName)
)->first();
// Option 1: output as a string
if(strpos($trigger['tgargs'],'\000') !== false) {
$argList = explode('\000', $trigger['tgargs']);
array_pop($argList);
// Option 2: hex-encoded (not sure why this happens, depends on PGSQL config)
} else {
$bytes = str_split($trigger['tgargs'],2);
$argList = array();
$nextArg = "";
foreach($bytes as $byte) {
if($byte == "00") {
$argList[] = $nextArg;
$nextArg = "";
} else {
$nextArg .= chr(hexdec($byte));
}
}
}
// Drop first two arguments (trigger name and config name) and implode into nice list
return array_slice($argList, 2);
}
public function indexList($table) {
//Retrieve a list of indexes for the specified table
$indexes = $this->preparedQuery("
SELECT tablename, indexname, indexdef
FROM pg_catalog.pg_indexes
WHERE tablename = ? AND schemaname = ?;",
array($table, $this->database->currentSchema())
);
$indexList = array();
foreach($indexes as $index) {
// Key for the indexList array. Differs from other DB implementations, which is why
// requireIndex() needed to be overridden
$indexName = $index['indexname'];
//We don't actually need the entire created command, just a few bits:
$type = '';
//Check for uniques:
if(substr($index['indexdef'], 0, 13)=='CREATE UNIQUE') {
$type = 'unique';
}
//check for hashes, btrees etc:
if(strpos(strtolower($index['indexdef']), 'using hash ')!==false) {
$type = 'hash';
}
//TODO: Fix me: btree is the default index type:
//if(strpos(strtolower($index['indexdef']), 'using btree ')!==false)
// $prefix='using btree ';
if(strpos(strtolower($index['indexdef']), 'using rtree ')!==false) {
$type = 'rtree';
}
// For fulltext indexes we need to extract the columns from another source
if (stristr($index['indexdef'], 'using gin')) {
$type = 'fulltext';
// Extract trigger information from postgres
$triggerName = preg_replace('/^ix_/', 'ts_', $index['indexname']);
$columns = $this->extractTriggerColumns($triggerName);
$columnString = $this->implodeColumnList($columns);
} else {
$columnString = $this->quoteColumnSpecString($index['indexdef']);
}
$indexList[$indexName] = $this->parseIndexSpec($index, array(
'name' => $indexName, // Not the correct name in the PHP, as this will be a mangled postgres-unique code
'value' => $columnString,
'type' => $type
));
}
return $indexList;
}
public function tableList() {
$tables = array();
$result = $this->preparedQuery(
"SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = ? AND tablename NOT ILIKE 'pg\\\_%' AND tablename NOT ILIKE 'sql\\\_%'",
array($this->database->currentSchema())
);
foreach($result as $record) {
$table = reset($record);
$tables[strtolower($table)] = $table;
}
return $tables;
}
/**
* Find out what the constraint information is, given a constraint name.
* We also cache this result, so the next time we don't need to do a
* query all over again.
*
* @param string $constraint
*/
function constraintExists($constraint){
if(!isset(self::$cached_constraints[$constraint])){
$exists = $this->preparedQuery("
SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true)
FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname = ? ORDER BY 1;",
array($constraint)
)->first();
self::$cached_constraints[$constraint]=$exists;
}
return self::$cached_constraints[$constraint];
}
/**
* A function to return the field names and datatypes for the particular table
*
* @param string $tableName
* @return array List of columns an an associative array with the keys Column and DataType
*/
public function tableDetails($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 = ? AND pg_catalog.pg_table_is_visible(c.oid) AND n.nspname = ?
);";
$result = $this->preparedQuery($query, $tableName, $this->database->currentSchema());
$table = array();
while($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
*
* @param string $triggerName Name of the trigger
* @param string $tableName Name of the table
*/
function dropTrigger($triggerName, $tableName){
$exists = $this->preparedQuery("
SELECT trigger_name
FROM information_schema.triggers
WHERE trigger_name = ? AND trigger_schema = ?;",
array($triggerName, $this->database->currentSchema())
)->first();
if($exists){
$this->query("DROP trigger IF EXISTS $triggerName ON \"$tableName\";");
}
}
/**
* This will return the fields that the trigger is monitoring
*
* @param string $trigger Name of the trigger
* @return array
*/
function triggerFieldsFromTrigger($trigger) {
if($trigger){
$tsvector='tsvector_update_trigger';
$ts_pos=strpos($trigger, $tsvector);
$details=trim(substr($trigger, $ts_pos+strlen($tsvector)), '();');
//Now split this into bits:
$bits=explode(',', $details);
$fields=$bits[2];
$field_bits=explode(',', str_replace('"', '', $fields));
$result=array();
foreach($field_bits as $field_bit)
$result[]=trim($field_bit);
return $result;
} else {
return false;
}
}
/**
* Return a boolean type-formatted string
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function boolean($values, $asDbValue=false){
//Annoyingly, we need to do a good ol' fashioned switch here:
$default = $values['default'] ? '1' : '0';
if(!isset($values['arrayValue'])) {
$values['arrayValue']='';
}
if($asDbValue) {
return array('data_type'=>'smallint');
}
if($values['arrayValue'] != '') {
$default = '';
} else {
$default = ' default ' . (int)$values['default'];
}
return "smallint{$values['arrayValue']}" . $default;
}
/**
* Return a date type-formatted string
*
* @param 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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function decimal($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'];
}
$defaultValue = '';
if(isset($values['default']) && is_numeric($values['default'])) {
$defaultValue = ' default ' . $values['default'];
}
if($asDbValue) {
return array('data_type' => 'numeric', 'precision' => $precision);
} else {
return "decimal($precision){$values['arrayValue']}$defaultValue";
}
}
/**
* Return a enum type-formatted string
*
* @param 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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function float($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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function double($values, $asDbValue=false){
return $this->float($values, $asDbValue);
}
/**
* Return a int type-formatted string
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function int($values, $asDbValue = false){
if(!isset($values['arrayValue'])) {
$values['arrayValue']='';
}
if($asDbValue) {
return Array('data_type'=>'integer', 'precision'=>'32');
}
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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function SS_Datetime($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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function text($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
*
* @param 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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function varchar($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
*
* @param array $values Contains a tokenised list of info about this data type
* @param boolean $asDbValue
* @return string
*/
public function year($values, $asDbValue = false){
if(!isset($values['arrayValue'])) {
$values['arrayValue'] = '';
}
//TODO: the DbValue result does not include the numeric_scale option (ie, the ,0 value in 4,0)
if($asDbValue) {
return array('data_type'=>'decimal', 'precision'=>'4');
} else {
return "decimal(4,0){$values['arrayValue']}";
}
}
/**
* 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 $this_index Index specification for the fulltext index
* @param string $tableName
* @param string $name
* @param array $spec
*/
function fulltext($this_index, $tableName, $name){
//For full text search, we need to create a column for the index
$columns = $this->quoteColumnSpecString($this_index['value']);
$fulltexts = "\"ts_$name\" tsvector";
$triggerName = $this->buildPostgresTriggerName($tableName, $name);
$language = PostgreSQLDatabase::search_language();
$this->dropTrigger($triggerName, $tableName);
$triggers = "CREATE TRIGGER \"$triggerName\" BEFORE INSERT OR UPDATE
ON \"$tableName\" FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger(\"ts_$name\", 'pg_catalog.$language', $columns);";
return array(
'name' => $name,
'ts_name' => "ts_{$name}",
'fulltexts' => $fulltexts,
'triggers' => $triggers
);
}
function IdColumn($asDbValue = false, $hasAutoIncPK = true){
if($asDbValue) return 'bigint';
else return 'serial8 not null';
}
public function hasTable($tableName) {
$result = $this->preparedQuery(
"SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = ? AND tablename = ?;",
array($this->database->currentSchema(), $tableName)
);
return ($result->numRecords() > 0);
}
/**
* Returns the values of the given enum field
*
* @todo Make a proper implementation
*
* @param string $tableName Name of table to check
* @param string $fieldName name of enum field to check
* @return array List of enum values
*/
function enumValuesForField($tableName, $fieldName) {
//return array('SiteTree','Page');
$constraints = $this->constraintExists("{$tableName}_{$fieldName}_check");
if($constraints) {
return $this->enumValuesFromConstraint($constraints['pg_get_constraintdef']);
} else {
return array();
}
}
function dbDataType($type){
$values = array(
'unsigned integer' => 'INT'
);
if(isset($values[$type])) return $values[$type];
else return '';
}
/*
* Given a tablespace and and location, either create a new one
* or update the existing one
*
* @param string $name
* @param string $location
*/
public function createOrReplaceTablespace($name, $location){
$existing = $this->preparedQuery(
"SELECT spcname, spclocation FROM pg_tablespace WHERE spcname = ?;",
array($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'])) {
$this->query("CREATE TABLESPACE $name LOCATION '$location';");
}
}
/**
*
* @param string $tableName
* @param array $partitions
* @param array $indexes
* @param array $extensions
*/
public function createOrReplacePartition($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->hasTable($partition_name)){
$this->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->preparedQuery(
"SELECT conname FROM pg_constraint WHERE conname = ?;",
array("{$partition_name}_pkey")
);
if($existing_constraint){
$this->query("ALTER TABLE \"$partition_name\" DROP CONSTRAINT \"{$partition_name}_pkey\";");
}
$this->dropTrigger(strtolower('trigger_' . $tableName . '_insert'), $tableName);
}
$this->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'];
}
$clusterMethod = PostgreSQLDatabase::default_fts_cluster_method();
$this->query("CREATE INDEX \"" . $this->buildPostgresIndexName($partition_name, $this_index['name']) . "\" ON \"" . $partition_name . "\" USING $clusterMethod(\"ts_" . $name . "\") $fillfactor $where");
$ts_details = $this->fulltext($this_index, $partition_name, $name);
$this->query($ts_details['triggers']);
} else {
if(is_array($this_index)) {
$index_name = $this_index['name'];
} else {
$index_name = trim($this_index, '()');
}
$createIndex = $this->getIndexSqlDefinition($partition_name, $index_name, $this_index);
if($createIndex !== false) {
$this->query($createIndex);
}
}
}
}
//Lastly, clustering goes here:
if($extensions && isset($extensions['cluster'])){
$this->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();';
$this->query($trigger);
}
/*
* This will create a language if it doesn't already exist.
* This is used by the createOrReplacePartition function, which needs plpgsql
*
* @param string $language Language name
*/
public function createLanguage($language){
$result = $this->preparedQuery(
"SELECT lanname FROM pg_language WHERE lanname = ?;",
array($language)
)->first();
if(!$result) {
$this->query("CREATE LANGUAGE $language;");
}
}
/**
* Return a set type-formatted string
* This is used for Multi-enum support, which isn't actually supported by Postgres.
* Throws a user error to show our lack of support, and return an "int", specifically for sapphire
* tests that test multi-enums. This results in a test failure, but not crashing the test run.
*
* @param array $values Contains a tokenised list of info about this data type
* @return string
*/
public function set($values){
user_error("PostGreSQL does not support multi-enum", E_USER_ERROR);
return "int";
}
}
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