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359 lines
12 KiB
359 lines
12 KiB
<?php
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/**
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V4.55 3 Jan 2005 (c) 2000-2005 John Lim (jlim@natsoft.com.my). All rights reserved.
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Released under both BSD license and Lesser GPL library license.
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Whenever there is any discrepancy between the two licenses,
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the BSD license will take precedence.
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Set tabs to 4 for best viewing.
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*/
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// security - hide paths
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if (!defined('ADODB_DIR')) die();
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class ADODB2_postgres extends ADODB_DataDict {
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var $databaseType = 'postgres';
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var $seqField = false;
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var $seqPrefix = 'SEQ_';
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var $addCol = ' ADD COLUMN';
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var $quote = '"';
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var $renameTable = 'ALTER TABLE %s RENAME TO %s'; // at least since 7.1
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function MetaType($t,$len=-1,$fieldobj=false)
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{
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if (is_object($t)) {
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$fieldobj = $t;
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$t = $fieldobj->type;
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$len = $fieldobj->max_length;
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}
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$is_serial = is_object($fieldobj) && $fieldobj->primary_key && $fieldobj->unique &&
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$fieldobj->has_default && substr($fieldobj->default_value,0,8) == 'nextval(';
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switch (strtoupper($t)) {
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case 'INTERVAL':
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case 'CHAR':
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case 'CHARACTER':
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case 'VARCHAR':
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case 'NAME':
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case 'BPCHAR':
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if ($len <= $this->blobSize) return 'C';
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case 'TEXT':
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return 'X';
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case 'IMAGE': // user defined type
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case 'BLOB': // user defined type
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case 'BIT': // This is a bit string, not a single bit, so don't return 'L'
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case 'VARBIT':
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case 'BYTEA':
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return 'B';
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case 'BOOL':
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case 'BOOLEAN':
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return 'L';
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case 'DATE':
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return 'D';
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case 'TIME':
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case 'DATETIME':
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case 'TIMESTAMP':
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case 'TIMESTAMPTZ':
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return 'T';
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case 'INTEGER': return !$is_serial ? 'I' : 'R';
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case 'SMALLINT':
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case 'INT2': return !$is_serial ? 'I2' : 'R';
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case 'INT4': return !$is_serial ? 'I4' : 'R';
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case 'BIGINT':
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case 'INT8': return !$is_serial ? 'I8' : 'R';
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case 'OID':
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case 'SERIAL':
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return 'R';
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case 'FLOAT4':
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case 'FLOAT8':
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case 'DOUBLE PRECISION':
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case 'REAL':
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return 'F';
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default:
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return 'N';
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}
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}
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function ActualType($meta)
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{
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switch($meta) {
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case 'C': return 'VARCHAR';
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case 'XL':
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case 'X': return 'TEXT';
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case 'C2': return 'VARCHAR';
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case 'X2': return 'TEXT';
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case 'B': return 'BYTEA';
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case 'D': return 'DATE';
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case 'T': return 'TIMESTAMP';
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case 'L': return 'SMALLINT';
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case 'I': return 'INTEGER';
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case 'I1': return 'SMALLINT';
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case 'I2': return 'INT2';
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case 'I4': return 'INT4';
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case 'I8': return 'INT8';
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case 'F': return 'FLOAT8';
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case 'N': return 'NUMERIC';
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default:
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return $meta;
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}
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}
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/**
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* Adding a new Column
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*
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* reimplementation of the default function as postgres does NOT allow to set the default in the same statement
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*
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* @param string $tabname table-name
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* @param string $flds column-names and types for the changed columns
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* @return array with SQL strings
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*/
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function AddColumnSQL($tabname, $flds)
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{
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$tabname = $this->TableName ($tabname);
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$sql = array();
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list($lines,$pkey) = $this->_GenFields($flds);
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$alter = 'ALTER TABLE ' . $tabname . $this->addCol . ' ';
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foreach($lines as $v) {
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if (($not_null = preg_match('/NOT NULL/i',$v))) {
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$v = preg_replace('/NOT NULL/i','',$v);
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}
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if (preg_match('/^([^ ]+) .*(DEFAULT [^ ]+)/',$v,$matches)) {
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list(,$colname,$default) = $matches;
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$sql[] = $alter . str_replace($default,'',$v);
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$sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET ' . $default;
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} else {
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$sql[] = $alter . $v;
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}
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if ($not_null) {
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list($colname) = explode(' ',$v);
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$sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET NOT NULL';
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}
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}
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return $sql;
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}
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/**
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* Change the definition of one column
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*
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* Postgres can't do that on it's own, you need to supply the complete defintion of the new table,
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* to allow, recreating the table and copying the content over to the new table
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* @param string $tabname table-name
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* @param string $flds column-name and type for the changed column
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* @param string $tableflds complete defintion of the new table, eg. for postgres, default ''
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* @param array/ $tableoptions options for the new table see CreateTableSQL, default ''
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* @return array with SQL strings
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*/
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function AlterColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
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{
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if (!$tableflds) {
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if ($this->debug) ADOConnection::outp("AlterColumnSQL needs a complete table-definiton for PostgreSQL");
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return array();
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}
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return $this->_recreate_copy_table($tabname,False,$tableflds,$tableoptions);
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}
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/**
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* Drop one column
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*
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* Postgres < 7.3 can't do that on it's own, you need to supply the complete defintion of the new table,
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* to allow, recreating the table and copying the content over to the new table
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* @param string $tabname table-name
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* @param string $flds column-name and type for the changed column
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* @param string $tableflds complete defintion of the new table, eg. for postgres, default ''
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* @param array/ $tableoptions options for the new table see CreateTableSQL, default ''
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* @return array with SQL strings
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*/
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function DropColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
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{
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$has_drop_column = 7.3 <= (float) @$this->serverInfo['version'];
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if (!$has_drop_column && !$tableflds) {
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if ($this->debug) ADOConnection::outp("DropColumnSQL needs complete table-definiton for PostgreSQL < 7.3");
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return array();
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}
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if ($has_drop_column) {
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return ADODB_DataDict::DropColumnSQL($tabname, $flds);
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}
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return $this->_recreate_copy_table($tabname,$flds,$tableflds,$tableoptions);
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}
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/**
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* Save the content into a temp. table, drop and recreate the original table and copy the content back in
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*
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* We also take care to set the values of the sequenz and recreate the indexes.
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* All this is done in a transaction, to not loose the content of the table, if something went wrong!
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* @internal
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* @param string $tabname table-name
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* @param string $dropflds column-names to drop
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* @param string $tableflds complete defintion of the new table, eg. for postgres
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* @param array/string $tableoptions options for the new table see CreateTableSQL, default ''
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* @return array with SQL strings
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*/
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function _recreate_copy_table($tabname,$dropflds,$tableflds,$tableoptions='')
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{
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if ($dropflds && !is_array($dropflds)) $dropflds = explode(',',$dropflds);
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$copyflds = array();
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foreach($this->MetaColumns($tabname) as $fld) {
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if (!$dropflds || !in_array($fld->name,$dropflds)) {
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// we need to explicit convert varchar to a number to be able to do an AlterColumn of a char column to a nummeric one
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if (preg_match('/'.$fld->name.' (I|I2|I4|I8|N|F)/i',$tableflds,$matches) &&
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in_array($fld->type,array('varchar','char','text','bytea'))) {
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$copyflds[] = "to_number($fld->name,'S99D99')";
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} else {
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$copyflds[] = $fld->name;
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}
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// identify the sequence name and the fld its on
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if ($fld->primary_key && $fld->has_default &&
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preg_match("/nextval\('([^']+)'::text\)/",$fld->default_value,$matches)) {
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$seq_name = $matches[1];
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$seq_fld = $fld->name;
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}
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}
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}
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$copyflds = implode(', ',$copyflds);
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$tempname = $tabname.'_tmp';
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$aSql[] = 'BEGIN'; // we use a transaction, to make sure not to loose the content of the table
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$aSql[] = "SELECT * INTO TEMPORARY TABLE $tempname FROM $tabname";
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$aSql = array_merge($aSql,$this->DropTableSQL($tabname));
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$aSql = array_merge($aSql,$this->CreateTableSQL($tabname,$tableflds,$tableoptions));
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$aSql[] = "INSERT INTO $tabname SELECT $copyflds FROM $tempname";
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if ($seq_name && $seq_fld) { // if we have a sequence we need to set it again
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$seq_name = $tabname.'_'.$seq_fld.'_seq'; // has to be the name of the new implicit sequence
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$aSql[] = "SELECT setval('$seq_name',MAX($seq_fld)) FROM $tabname";
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}
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$aSql[] = "DROP TABLE $tempname";
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// recreate the indexes, if they not contain one of the droped columns
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foreach($this->MetaIndexes($tabname) as $idx_name => $idx_data)
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{
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if (substr($idx_name,-5) != '_pkey' && (!$dropflds || !count(array_intersect($dropflds,$idx_data['columns'])))) {
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$aSql = array_merge($aSql,$this->CreateIndexSQL($idx_name,$tabname,$idx_data['columns'],
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$idx_data['unique'] ? array('UNIQUE') : False));
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}
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}
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$aSql[] = 'COMMIT';
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return $aSql;
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}
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function DropTableSQL($tabname)
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{
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$sql = ADODB_DataDict::DropTableSQL($tabname);
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$drop_seq = $this->_DropAutoIncrement($tabname);
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if ($drop_seq) $sql[] = $drop_seq;
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return $sql;
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}
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// return string must begin with space
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function _CreateSuffix($fname, &$ftype, $fnotnull,$fdefault,$fautoinc,$fconstraint)
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{
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if ($fautoinc) {
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$ftype = 'SERIAL';
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return '';
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}
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$suffix = '';
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if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
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if ($fnotnull) $suffix .= ' NOT NULL';
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if ($fconstraint) $suffix .= ' '.$fconstraint;
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return $suffix;
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}
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// search for a sequece for the given table (asumes the seqence-name contains the table-name!)
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// if yes return sql to drop it
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// this is still necessary if postgres < 7.3 or the SERIAL was created on an earlier version!!!
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function _DropAutoIncrement($tabname)
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{
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$tabname = $this->connection->quote('%'.$tabname.'%');
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$seq = $this->connection->GetOne("SELECT relname FROM pg_class WHERE NOT relname ~ 'pg_.*' AND relname LIKE $tabname AND relkind='S'");
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// check if a tables depends on the sequenz and it therefor cant and dont need to be droped separatly
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if (!$seq || $this->connection->GetOne("SELECT relname FROM pg_class JOIN pg_depend ON pg_class.relfilenode=pg_depend.objid WHERE relname='$seq' AND relkind='S' AND deptype='i'")) {
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return False;
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}
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return "DROP SEQUENCE ".$seq;
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}
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/*
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CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name (
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{ column_name data_type [ DEFAULT default_expr ] [ column_constraint [, ... ] ]
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| table_constraint } [, ... ]
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)
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[ INHERITS ( parent_table [, ... ] ) ]
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[ WITH OIDS | WITHOUT OIDS ]
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where column_constraint is:
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[ CONSTRAINT constraint_name ]
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{ NOT NULL | NULL | UNIQUE | PRIMARY KEY |
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CHECK (expression) |
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REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL ]
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[ ON DELETE action ] [ ON UPDATE action ] }
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[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
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and table_constraint is:
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[ CONSTRAINT constraint_name ]
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{ UNIQUE ( column_name [, ... ] ) |
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PRIMARY KEY ( column_name [, ... ] ) |
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CHECK ( expression ) |
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FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ]
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[ MATCH FULL | MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] }
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[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
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*/
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/*
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CREATE [ UNIQUE ] INDEX index_name ON table
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[ USING acc_method ] ( column [ ops_name ] [, ...] )
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[ WHERE predicate ]
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CREATE [ UNIQUE ] INDEX index_name ON table
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[ USING acc_method ] ( func_name( column [, ... ]) [ ops_name ] )
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[ WHERE predicate ]
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*/
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function _IndexSQL($idxname, $tabname, $flds, $idxoptions)
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{
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$sql = array();
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if ( isset($idxoptions['REPLACE']) || isset($idxoptions['DROP']) ) {
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$sql[] = sprintf ($this->dropIndex, $idxname, $tabname);
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if ( isset($idxoptions['DROP']) )
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return $sql;
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}
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if ( empty ($flds) ) {
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return $sql;
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}
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$unique = isset($idxoptions['UNIQUE']) ? ' UNIQUE' : '';
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$s = 'CREATE' . $unique . ' INDEX ' . $idxname . ' ON ' . $tabname . ' ';
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if (isset($idxoptions['HASH']))
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$s .= 'USING HASH ';
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if ( isset($idxoptions[$this->upperName]) )
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$s .= $idxoptions[$this->upperName];
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if ( is_array($flds) )
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$flds = implode(', ',$flds);
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$s .= '(' . $flds . ')';
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$sql[] = $s;
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return $sql;
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}
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}
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?>
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