/usr/share/php/Horde/Db/Adapter/Postgresql/Schema.php is in php-horde-db 2.3.1-1ubuntu2.
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/**
* Copyright 2007 Maintainable Software, LLC
* Copyright 2008-2016 Horde LLC (http://www.horde.org/)
*
* @author Mike Naberezny <mike@maintainable.com>
* @author Derek DeVries <derek@maintainable.com>
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Jan Schneider <jan@horde.org>
* @license http://www.horde.org/licenses/bsd
* @category Horde
* @package Db
* @subpackage Adapter
*/
/**
* Class for PostgreSQL-specific managing of database schemes and handling of
* SQL dialects and quoting.
*
* @author Mike Naberezny <mike@maintainable.com>
* @author Derek DeVries <derek@maintainable.com>
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Jan Schneider <jan@horde.org>
* @license http://www.horde.org/licenses/bsd
* @category Horde
* @package Db
* @subpackage Adapter
*/
class Horde_Db_Adapter_Postgresql_Schema extends Horde_Db_Adapter_Base_Schema
{
/**
* The active schema search path.
*
* @var string
*/
protected $_schemaSearchPath = '';
/**
* Cached version.
*
* @var integer
*/
protected $_version;
/*##########################################################################
# Object factories
##########################################################################*/
/**
* Factory for Column objects.
*
* @param string $name The column's name, such as "supplier_id" in
* "supplier_id int(11)".
* @param string $default The type-casted default value, such as "new" in
* "sales_stage varchar(20) default 'new'".
* @param string $sqlType Used to extract the column's type, length and
* signed status, if necessary. For example
* "varchar" and "60" in "company_name varchar(60)"
* or "unsigned => true" in "int(10) UNSIGNED".
* @param boolean $null Whether this column allows NULL values.
*
* @return Horde_Db_Adapter_Postgresql_Column A column object.
*/
public function makeColumn($name, $default, $sqlType = null, $null = true)
{
return new Horde_Db_Adapter_Postgresql_Column($name, $default, $sqlType, $null);
}
/*##########################################################################
# Quoting
##########################################################################*/
/**
* Quotes the column value to help prevent SQL injection attacks.
*
* This method makes educated guesses on the scalar type based on the
* passed value. Make sure to correctly cast the value and/or pass the
* $column parameter to get the best results.
*
* @param mixed $value The scalar value to quote, a Horde_Db_Value,
* Horde_Date, or DateTime instance, or an object
* implementing quotedId().
* @param object $column An object implementing getType().
*
* @return string The correctly quoted value.
*/
public function quote($value, $column = null)
{
if (!$column) {
return parent::quote($value, $column);
}
if (is_string($value) &&
$column->getType() == 'binary') {
return $this->quoteBinary($value);
}
if (is_string($value) && $column->getSqlType() == 'xml') {
return "xml '" . $this->quoteString($value) . "'";
}
if (is_numeric($value) && $column->getSqlType() == 'money') {
// Not truly string input, so doesn't require (or allow) escape
// string syntax.
return "'" . $value . "'";
}
if (is_string($value) && substr($column->getSqlType(), 0, 3) == 'bit') {
if (preg_match('/^[0-9A-F]*$/i')) {
// Hexadecimal notation
return "X'" . $value . "'";
}
if (preg_match('/^[01]*$/', $value)) {
// Bit-string notation
return "B'" . $value . "'";
}
}
return parent::quote($value, $column);
}
/**
* Returns a quoted sequence name.
*
* PostgreSQL specific method.
*
* @param string $name A sequence name.
*
* @return string The quoted sequence name.
*/
public function quoteSequenceName($name)
{
return '\'' . str_replace('"', '""', $name) . '\'';
}
/**
* Returns a quoted boolean true.
*
* @return string The quoted boolean true.
*/
public function quoteTrue()
{
return "'t'";
}
/**
* Returns a quoted boolean false.
*
* @return string The quoted boolean false.
*/
public function quoteFalse()
{
return "'f'";
}
/**
* Returns a quoted binary value.
*
* @param mixed A binary value.
*
* @return string The quoted binary value.
*/
public function quoteBinary($value)
{
if ($this->postgresqlVersion() >= 90000) {
return "E'\\\\x" . bin2hex($value) . "'";
}
/* MUST escape zero octet(0), single quote (39), and backslash (92).
* MAY escape non-printable octets, but they are required in some
* instances so it is best to escape all. */
return "E'" . preg_replace_callback("/[\\x00-\\x1f\\x27\\x5c\\x7f-\\xff]/", array($this, '_quoteBinaryCallback'), $value) . "'";
}
/**
* Callback function for quoteBinary().
*
* @param array $matches Matches from preg_replace().
*
* @return string Escaped/encoded binary value.
*/
protected function _quoteBinaryCallback($matches)
{
return sprintf('\\\\%03.o', ord($matches[0]));
}
/*##########################################################################
# Schema Statements
##########################################################################*/
/**
* Returns a hash of mappings from the abstract data types to the native
* database types.
*
* See TableDefinition::column() for details on the recognized abstract
* data types.
*
* @see TableDefinition::column()
*
* @return array A database type map.
*/
public function nativeDatabaseTypes()
{
return array(
'autoincrementKey' => 'serial primary key',
'string' => array('name' => 'character varying',
'limit' => 255),
'text' => array('name' => 'text',
'limit' => null),
'mediumtext' => array('name' => 'text',
'limit' => null),
'longtext' => array('name' => 'text',
'limit' => null),
'integer' => array('name' => 'integer',
'limit' => null),
'float' => array('name' => 'float',
'limit' => null),
'decimal' => array('name' => 'decimal',
'limit' => null),
'datetime' => array('name' => 'timestamp',
'limit' => null),
'timestamp' => array('name' => 'timestamp',
'limit' => null),
'time' => array('name' => 'time',
'limit' => null),
'date' => array('name' => 'date',
'limit' => null),
'binary' => array('name' => 'bytea',
'limit' => null),
'boolean' => array('name' => 'boolean',
'limit' => null),
);
}
/**
* Returns the maximum length a table alias can have.
*
* Returns the configured supported identifier length supported by
* PostgreSQL.
*
* @return integer The maximum table alias length.
*/
public function tableAliasLength()
{
return (int)$this->selectValue('SHOW max_identifier_length');
}
/**
* Returns a list of all tables in the schema search path.
*
* @return array A table list.
*/
public function tables()
{
return $this->selectValues('SELECT table_name FROM information_schema.tables WHERE table_schema = ANY (CURRENT_SCHEMAS(false));');
}
/**
* Returns a table's primary key.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return Horde_Db_Adapter_Base_Index The primary key index object.
*/
public function primaryKey($tableName, $name = null)
{
$sql = '
SELECT column_name
FROM information_schema.constraint_column_usage
WHERE table_name = ?
AND constraint_name = (SELECT constraint_name
FROM information_schema.table_constraints
WHERE table_name = ?
AND constraint_type = ?)';
$pk = $this->selectValues($sql,
array($tableName, $tableName, 'PRIMARY KEY'),
$name);
return $this->makeIndex($tableName, 'PRIMARY', true, true, $pk);
}
/**
* Returns a list of tables indexes.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return array A list of Horde_Db_Adapter_Base_Index objects.
*/
public function indexes($tableName, $name = null)
{
$indexes = @unserialize($this->cacheRead("tables/indexes/$tableName"));
if (!$indexes) {
$sql = "
SELECT distinct i.relname, d.indisunique, a.attname
FROM pg_class t, pg_class i, pg_index d, pg_attribute a
WHERE i.relkind = 'i'
AND d.indexrelid = i.oid
AND d.indisprimary = 'f'
AND t.oid = d.indrelid
AND t.relname = " . $this->quote($tableName) . "
AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY(CURRENT_SCHEMAS(false)))
AND a.attrelid = t.oid
AND (d.indkey[0] = a.attnum OR d.indkey[1] = a.attnum
OR d.indkey[2] = a.attnum OR d.indkey[3] = a.attnum
OR d.indkey[4] = a.attnum OR d.indkey[5] = a.attnum
OR d.indkey[6] = a.attnum OR d.indkey[7] = a.attnum
OR d.indkey[8] = a.attnum OR d.indkey[9] = a.attnum)
ORDER BY i.relname";
$result = $this->select($sql, $name);
$currentIndex = null;
$indexes = array();
foreach ($result as $row) {
if ($currentIndex != $row['relname']) {
$currentIndex = $row['relname'];
$indexes[] = $this->makeIndex(
$tableName, $row['relname'], false, $row['indisunique'] == 't', array());
}
$indexes[count($indexes) - 1]->columns[] = $row['attname'];
}
$this->cacheWrite("tables/indexes/$tableName", serialize($indexes));
}
return $indexes;
}
/**
* Returns a list of table columns.
*
* @param string $tableName A table name.
* @param string $name (can be removed?)
*
* @return array A list of Horde_Db_Adapter_Base_Column objects.
*/
public function columns($tableName, $name = null)
{
$rows = @unserialize($this->cacheRead("tables/columns/$tableName"));
if (!$rows) {
$rows = $this->_columnDefinitions($tableName, $name);
$this->cacheWrite("tables/columns/$tableName", serialize($rows));
}
// Create columns from rows.
$columns = array();
foreach ($rows as $row) {
$columns[$row['attname']] = $this->makeColumn(
$row['attname'], $row['adsrc'], $row['format_type'], !(boolean)$row['attnotnull']);
}
return $columns;
}
/**
* Returns the list of a table's column names, data types, and default
* values.
*
* The underlying query is roughly:
* SELECT column.name, column.type, default.value
* FROM column LEFT JOIN default
* ON column.table_id = default.table_id
* AND column.num = default.column_num
* WHERE column.table_id = get_table_id('table_name')
* AND column.num > 0
* AND NOT column.is_dropped
* ORDER BY column.num
*
* If the table name is not prefixed with a schema, the database will take
* the first match from the schema search path.
*
* Query implementation notes:
* - format_type includes the column size constraint, e.g. varchar(50)
* - ::regclass is a function that gives the id for a table name
*/
protected function _columnDefinitions($tableName, $name = null)
{
/* @todo See if we can get this from information_schema instead */
return $this->selectAll('
SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = ' . $this->quote($tableName) . '::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum', $name);
}
/**
* Renames a table.
*
* @param string $name A table name.
* @param string $newName The new table name.
*/
public function renameTable($name, $newName)
{
$this->_clearTableCache($name);
return $this->execute(sprintf('ALTER TABLE %s RENAME TO %s', $this->quoteTableName($name), $this->quoteTableName($newName)));
}
/**
* Adds a new column to a table.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $type A data type.
* @param array $options Column options. See
* Horde_Db_Adapter_Base_TableDefinition#column()
* for details.
*/
public function addColumn($tableName, $columnName, $type,
$options = array())
{
$this->_clearTableCache($tableName);
$options = array_merge(
array('autoincrement' => null,
'limit' => null,
'precision' => null,
'scale' => null),
$options);
$sqltype = $this->typeToSql($type, $options['limit'],
$options['precision'], $options['scale']);
/* Convert to SERIAL type if needed. */
if ($options['autoincrement']) {
switch ($sqltype) {
case 'bigint':
$sqltype = 'BIGSERIAL';
break;
case 'integer':
default:
$sqltype = 'SERIAL';
break;
}
}
// Add the column.
$sql = sprintf('ALTER TABLE %s ADD COLUMN %s %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$sqltype);
$this->execute($sql);
if (array_key_exists('default', $options)) {
$sql = sprintf('UPDATE %s SET %s = %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quote($options['default']));
$this->execute($sql);
$this->changeColumnDefault($tableName, $columnName,
$options['default']);
}
if (isset($options['null']) && $options['null'] === false) {
$this->changeColumnNull(
$tableName, $columnName, false,
isset($options['default']) ? $options['default'] : null);
}
}
/**
* Changes an existing column's definition.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $type A data type.
* @param array $options Column options. See
* Horde_Db_Adapter_Base_TableDefinition#column()
* for details.
*/
public function changeColumn($tableName, $columnName, $type,
$options = array())
{
$this->_clearTableCache($tableName);
$options = array_merge(
array('autoincrement' => null,
'limit' => null,
'precision' => null,
'scale' => null),
$options);
$quotedTableName = $this->quoteTableName($tableName);
$primaryKey = $type == 'autoincrementKey';
if ($primaryKey) {
$type = 'integer';
$options['autoincrement'] = true;
$options['limit'] = $options['precision'] = $options['scale'] = null;
try {
$this->removePrimaryKey($tableName);
} catch (Horde_Db_Exception $e) {
}
}
$sql = sprintf('ALTER TABLE %s ALTER COLUMN %s TYPE %s',
$quotedTableName,
$this->quoteColumnName($columnName),
$this->typeToSql($type,
$options['limit'],
$options['precision'],
$options['scale']));
try {
$this->execute($sql);
} catch (Horde_Db_Exception $e) {
// This is PostgreSQL 7.x, or the old type could not be coerced to
// the new type, so we have to use a more arcane way of doing it.
try {
// Booleans can't always be cast to other data types; do extra
// work to handle them.
$oldType = $this->column($tableName, $columnName)->getType();
$this->beginDbTransaction();
$tmpColumnName = $columnName.'_change_tmp';
$this->addColumn($tableName, $tmpColumnName, $type, $options);
if ($oldType == 'boolean') {
$sql = sprintf('UPDATE %s SET %s = CAST(CASE WHEN %s IS TRUE THEN 1 ELSE 0 END AS %s)',
$quotedTableName,
$this->quoteColumnName($tmpColumnName),
$this->quoteColumnName($columnName),
$this->typeToSql($type,
$options['limit'],
$options['precision'],
$options['scale']));
} else {
$sql = sprintf('UPDATE %s SET %s = CAST(%s AS %s)',
$quotedTableName,
$this->quoteColumnName($tmpColumnName),
$this->quoteColumnName($columnName),
$this->typeToSql($type,
$options['limit'],
$options['precision'],
$options['scale']));
}
$this->execute($sql);
$this->removeColumn($tableName, $columnName);
$this->renameColumn($tableName, $tmpColumnName, $columnName);
$this->commitDbTransaction();
} catch (Horde_Db_Exception $e) {
$this->rollbackDbTransaction();
throw $e;
}
}
if ($options['autoincrement']) {
$seq_name = $this->defaultSequenceName($tableName, $columnName);
try {
$this->execute('DROP SEQUENCE ' . $seq_name . ' CASCADE');
} catch (Horde_Db_Exception $e) {}
$this->execute('CREATE SEQUENCE ' . $seq_name);
$this->resetPkSequence($tableName, $columnName, $seq_name);
/* Can't use changeColumnDefault() since it quotes the
* default value (NEXTVAL is a postgres keyword, not a text
* value). */
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s ALTER COLUMN %s SET DEFAULT NEXTVAL(%s)',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quoteSequenceName($seq_name));
$this->execute($sql);
$sql = sprintf('ALTER SEQUENCE %s OWNED BY %s.%s',
$seq_name,
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName));
$this->execute($sql);
} elseif (array_key_exists('default', $options)) {
$this->changeColumnDefault($tableName, $columnName,
$options['default']);
}
if ($primaryKey) {
$this->addPrimaryKey($tableName, $columnName);
}
if (array_key_exists('null', $options)) {
$this->changeColumnNull(
$tableName, $columnName, $options['null'],
isset($options['default']) ? $options['default'] : null);
}
}
/**
* Sets a new default value for a column.
*
* If you want to set the default value to NULL, you are out of luck. You
* need to execute the apppropriate SQL statement yourself.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param mixed $default The new default value.
*/
public function changeColumnDefault($tableName, $columnName, $default)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s ALTER COLUMN %s SET DEFAULT %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quote($default));
return $this->execute($sql);
}
/**
* Sets whether a column allows NULL values.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param boolean $null Whether NULL values are allowed.
* @param mixed $default The new default value.
*/
public function changeColumnNull($tableName, $columnName, $null,
$default = null)
{
$this->_clearTableCache($tableName);
if (!$null && !is_null($default)) {
$sql = sprintf('UPDATE %s SET %s = %s WHERE %s IS NULL',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quote($default),
$this->quoteColumnName($columnName));
$this->execute($sql);
}
$sql = sprintf('ALTER TABLE %s ALTER %s %s NOT NULL',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$null ? 'DROP' : 'SET');
return $this->execute($sql);
}
/**
* Renames a column.
*
* @param string $tableName A table name.
* @param string $columnName A column name.
* @param string $newColumnName The new column name.
*/
public function renameColumn($tableName, $columnName, $newColumnName)
{
$this->_clearTableCache($tableName);
$sql = sprintf('ALTER TABLE %s RENAME COLUMN %s TO %s',
$this->quoteTableName($tableName),
$this->quoteColumnName($columnName),
$this->quoteColumnName($newColumnName));
return $this->execute($sql);
}
/**
* Removes a primary key from a table.
*
* @param string $tableName A table name.
*
* @throws Horde_Db_Exception
*/
public function removePrimaryKey($tableName)
{
$this->_clearTableCache($tableName);
$keyName = $this->selectValue(
'SELECT constraint_name
FROM information_schema.table_constraints
WHERE table_name = ?
AND constraint_type = ?',
array($tableName, 'PRIMARY KEY'));
if ($keyName) {
$sql = sprintf('ALTER TABLE %s DROP CONSTRAINT %s CASCADE',
$this->quoteTableName($tableName),
$this->quoteColumnName($keyName));
return $this->execute($sql);
}
}
/**
* Removes an index from a table.
*
* See parent class for examples.
*
* @param string $tableName A table name.
* @param string|array $options Either a column name or index options:
* - name: (string) the index name.
* - column: (string|array) column name(s).
*/
public function removeIndex($tableName, $options = array())
{
$this->_clearTableCache($tableName);
return $this->execute('DROP INDEX ' . $this->indexName($tableName, $options));
}
/**
* Creates a database.
*
* @param string $name A database name.
* @param array $options Database options: owner, template, charset,
* tablespace, and connection_limit.
*/
public function createDatabase($name, $options = array())
{
$options = array_merge(array('charset' => 'utf8'), $options);
$optionString = '';
foreach ($options as $key => $value) {
switch ($key) {
case 'owner':
$optionString .= " OWNER = '$value'";
break;
case 'template':
$optionString .= " TEMPLATE = $value";
break;
case 'charset':
$optionString .= " ENCODING = '$value'";
break;
case 'tablespace':
$optionString .= " TABLESPACE = $value";
break;
case 'connection_limit':
$optionString .= " CONNECTION LIMIT = $value";
}
}
return $this->execute('CREATE DATABASE ' . $this->quoteTableName($name) . $optionString);
}
/**
* Drops a database.
*
* @param string $name A database name.
*/
public function dropDatabase($name)
{
return $this->execute('DROP DATABASE IF EXISTS ' . $this->quoteTableName($name));
}
/**
* Returns the name of the currently selected database.
*
* @return string The database name.
*/
public function currentDatabase()
{
return $this->selectValue('SELECT current_database()');
}
/**
* Generates the SQL definition for a column type.
*
* @param string $type A column type.
* @param integer $limit Maximum column length (non decimal type only)
* @param integer $precision The number precision (decimal type only).
* @param integer $scale The number scaling (decimal columns only).
* @param boolean $unsigned Whether the column is an unsigned number
* (non decimal columns only).
*
* @return string The SQL definition. If $type is not one of the
* internally supported types, $type is returned unchanged.
*/
public function typeToSql($type, $limit = null, $precision = null,
$scale = null, $unsigned = null)
{
if ($type != 'integer') {
return parent::typeToSql($type, $limit, $precision, $scale);
}
switch ($limit) {
case 1:
case 2:
return 'smallint';
case 3:
case 4:
case null:
return 'integer';
case 5:
case 6:
case 7:
case 8:
return 'bigint';
}
throw new Horde_Db_Exception("No integer type has byte size $limit. Use a numeric with precision 0 instead.");
}
/**
* Generates a DISTINCT clause for SELECT queries.
*
* PostgreSQL requires the ORDER BY columns in the SELECT list for distinct
* queries, and requires that the ORDER BY include the DISTINCT column.
*
* <code>
* $connection->distinct('posts.id', 'posts.created_at DESC')
* </code>
*
* @param string $columns A column list.
* @param string $orderBy An ORDER clause.
*
* @return string The generated DISTINCT clause.
*/
public function distinct($columns, $orderBy = null)
{
if (empty($orderBy)) {
return 'DISTINCT ' . $columns;
}
// Construct a clean list of column names from the ORDER BY clause,
// removing any ASC/DESC modifiers.
$orderColumns = array();
foreach (preg_split('/\s*,\s*/', $orderBy, -1, PREG_SPLIT_NO_EMPTY) as $orderByClause) {
$orderColumns[] = current(preg_split('/\s+/', $orderByClause, -1, PREG_SPLIT_NO_EMPTY)) . ' AS alias_' . count($orderColumns);
}
// Return a DISTINCT ON() clause that's distinct on the columns we want
// but includes all the required columns for the ORDER BY to work
// properly.
return sprintf('DISTINCT ON (%s) %s, %s',
$columns, $columns, implode(', ', $orderColumns));
}
/**
* Adds an ORDER BY clause to an existing query.
*
* PostgreSQL does not allow arbitrary ordering when using DISTINCT ON, so
* we work around this by wrapping the $sql string as a sub-select and
* ordering in that query.
*
* @param string $sql An SQL query to manipulate.
* @param array $options Options:
* - order: Order column an direction.
*
* @return string The manipulated SQL query.
*/
public function addOrderByForAssociationLimiting($sql, $options)
{
if (empty($options['order'])) {
return $sql;
}
$order = array();
foreach (preg_split('/\s*,\s*/', $options['order'], -1, PREG_SPLIT_NO_EMPTY) as $s) {
if (preg_match('/\bdesc$/i', $s)) {
$s = 'DESC';
}
$order[] = 'id_list.alias_' . count($order) . ' ' . $s;
}
$order = implode(', ', $order);
return sprintf('SELECT * FROM (%s) AS id_list ORDER BY %s',
$sql, $order);
}
/**
* Generates an INTERVAL clause for SELECT queries.
*
* @param string $interval The interval.
* @param string $precision The precision.
*
* @return string The generated INTERVAL clause.
*/
public function interval($interval, $precision)
{
return 'INTERVAL \'' . $interval . ' ' . $precision . '\'';
}
/**
* Generates a modified date for SELECT queries.
*
* @param string $reference The reference date - this is a column
* referenced in the SELECT.
* @param string $operator Add or subtract time? (+/-)
* @param integer $amount The shift amount (number of days if $interval
* is DAY, etc).
* @param string $interval The interval (SECOND, MINUTE, HOUR, DAY,
* MONTH, YEAR).
*
* @return string The generated INTERVAL clause.
*/
public function modifyDate($reference, $operator, $amount, $interval)
{
if (!is_int($amount)) {
throw new InvalidArgumentException('$amount parameter must be an integer');
}
return sprintf('%s %s INTERVAL \'%s %s\'',
$reference,
$operator,
$amount,
$interval);
}
/**
* Returns an expression using the specified operator.
*
* @param string $lhs The column or expression to test.
* @param string $op The operator.
* @param string $rhs The comparison value.
* @param boolean $bind If true, the method returns the query and a list
* of values suitable for binding as an array.
* @param array $params Any additional parameters for the operator.
*
* @return string|array The SQL test fragment, or an array containing the
* query and a list of values if $bind is true.
*/
public function buildClause($lhs, $op, $rhs, $bind = false,
$params = array())
{
$lhs = $this->_escapePrepare($lhs);
switch ($op) {
case '|':
case '&':
/* Only PgSQL 7.3+ understands SQL99 'SIMILAR TO'; use ~ for
* greater backwards compatibility. */
$query = 'CASE WHEN CAST(%s AS VARCHAR) ~ \'^-?[0-9]+$\' THEN (CAST(%s AS INTEGER) %s %s) ELSE 0 END';
if ($bind) {
return array(sprintf($query, $lhs, $lhs, $op, '?'),
array((int)$rhs));
} else {
return sprintf($query, $lhs, $lhs, $op, (int)$rhs);
}
case 'LIKE':
$query = '%s ILIKE %s';
if ($bind) {
if (empty($params['begin'])) {
return array(sprintf($query, $lhs, '?'),
array('%' . $rhs . '%'));
}
return array(sprintf('(' . $query . ' OR ' . $query . ')',
$lhs, '?', $lhs, '?'),
array($rhs . '%', '% ' . $rhs . '%'));
}
if (empty($params['begin'])) {
return sprintf($query,
$lhs,
$this->_escapePrepare($this->quote('%' . $rhs . '%')));
}
return sprintf('(' . $query . ' OR ' . $query . ')',
$lhs,
$this->_escapePrepare($this->quote($rhs . '%')),
$lhs,
$this->_escapePrepare($this->quote('% ' . $rhs . '%')));
}
return parent::buildClause($lhs, $op, $rhs, $bind, $params);
}
/*##########################################################################
# PostgreSQL specific methods
##########################################################################*/
/**
* Returns the current database's encoding format.
*
* @return string The current database's encoding format.
*/
public function encoding()
{
return $this->selectValue(
'SELECT pg_encoding_to_char(pg_database.encoding) FROM pg_database
WHERE pg_database.datname LIKE ' . $this->quote($this->currentDatabase()));
}
/**
* Sets the schema search path to a string of comma-separated schema names.
*
* Names beginning with $ have to be quoted (e.g. $user => '$user'). See:
* http://www.postgresql.org/docs/current/static/ddl-schemas.html
*
* @param string $schemaCsv A comma-separated schema name list.
*/
public function setSchemaSearchPath($schemaCsv)
{
if ($schemaCsv) {
$this->execute('SET search_path TO ' . $schemaCsv);
$this->_schemaSearchPath = $schemaCsv;
}
}
/**
* Returns the current client log message level.
*
* @return string The current client log message level.
*/
public function getClientMinMessages()
{
return $this->selectValue('SHOW client_min_messages');
}
/**
* Sets the client log message level.
*
* @param string $level The client log message level. One of DEBUG5,
* DEBUG4, DEBUG3, DEBUG2, DEBUG1, LOG, NOTICE,
* WARNING, ERROR, FATAL, or PANIC.
*/
public function setClientMinMessages($level)
{
return $this->execute('SET client_min_messages TO ' . $this->quote($level));
}
/**
* Returns the sequence name for a table's primary key or some other
* specified key.
*
* If a sequence name doesn't exist, it is built from the table and primary
* key name.
*
* @param string $tableName A table name.
* @param string $pk A primary key name. Overrides the existing key
* name when building a new sequence name.
*
* @return string The key's sequence name.
*/
public function defaultSequenceName($tableName, $pk = null)
{
list($defaultPk, $defaultSeq) = $this->pkAndSequenceFor($tableName);
if (!$defaultSeq) {
$defaultSeq = $tableName . '_' . ($pk ? $pk : ($defaultPk ? $defaultPk : 'id')) . '_seq';
}
return $defaultSeq;
}
/**
* Resets the sequence of a table's primary key to the maximum value.
*
* @param string $tableName A table name.
* @param string $pk A primary key name. Defaults to the existing
* primary key.
* @param string $sequence A sequence name. Defaults to the sequence name
* of the existing primary key.
*
* @return integer The (next) sequence value if a primary key and a
* sequence exist.
*/
public function resetPkSequence($table, $pk = null, $sequence = null)
{
if (!$pk || !$sequence) {
list($defaultPk, $defaultSequence) = $this->pkAndSequenceFor($table);
if (!$pk) {
$pk = $defaultPk;
}
if (!$sequence) {
$sequence = $defaultSequence;
}
}
if ($pk) {
if ($sequence) {
$quotedSequence = $this->quoteSequenceName($sequence);
$quotedTable = $this->quoteTableName($table);
$quotedPk = $this->quoteColumnName($pk);
$sql = sprintf('SELECT setval(%s, (SELECT COALESCE(MAX(%s) + (SELECT increment_by FROM %s), (SELECT min_value FROM %s)) FROM %s), false)',
$quotedSequence,
$quotedPk,
$sequence,
$sequence,
$quotedTable);
$this->selectValue($sql, 'Reset sequence');
} else {
if ($this->_logger) {
$this->_logger->warn(sprintf('%s has primary key %s with no default sequence', $table, $pk));
}
}
}
}
/**
* Returns a table's primary key and the key's sequence.
*
* @param string $tableName A table name.
*
* @return array Array with two values: the primary key name and the key's
* sequence name.
*/
public function pkAndSequenceFor($table)
{
// First try looking for a sequence with a dependency on the
// given table's primary key.
$sql = "
SELECT attr.attname, seq.relname
FROM pg_class seq,
pg_attribute attr,
pg_depend dep,
pg_namespace name,
pg_constraint cons
WHERE seq.oid = dep.objid
AND seq.relkind = 'S'
AND attr.attrelid = dep.refobjid
AND attr.attnum = dep.refobjsubid
AND attr.attrelid = cons.conrelid
AND attr.attnum = cons.conkey[1]
AND cons.contype = 'p'
AND dep.refobjid = '$table'::regclass";
$result = $this->selectOne($sql, 'PK and serial sequence');
if (!$result) {
// If that fails, try parsing the primary key's default value.
// Support the 7.x and 8.0 nextval('foo'::text) as well as
// the 8.1+ nextval('foo'::regclass).
$sql = "
SELECT attr.attname,
CASE
WHEN split_part(def.adsrc, '''', 2) ~ '.' THEN
substr(split_part(def.adsrc, '''', 2),
strpos(split_part(def.adsrc, '''', 2), '.')+1)
ELSE split_part(def.adsrc, '''', 2)
END AS relname
FROM pg_class t
JOIN pg_attribute attr ON (t.oid = attrelid)
JOIN pg_attrdef def ON (adrelid = attrelid AND adnum = attnum)
JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1])
WHERE t.oid = '$table'::regclass
AND cons.contype = 'p'
AND def.adsrc ~* 'nextval'";
$result = $this->selectOne($sql, 'PK and custom sequence');
}
// [primary_key, sequence]
return array($result['attname'], $result['relname']);
}
/**
* Returns the version of the connected PostgreSQL server.
*
* @return integer Zero padded PostgreSQL version, e.g. 80108 for 8.1.8.
*/
public function postgresqlVersion()
{
if (!$this->_version) {
try {
$version = $this->selectValue('SELECT version()');
if (preg_match('/PostgreSQL (\d+)\.(\d+)\.(\d+)/', $version, $matches))
$this->_version = ($matches[1] * 10000) + ($matches[2] * 100) + $matches[3];
} catch (Exception $e) {
return 0;
}
}
return $this->_version;
}
}
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