253 lines
9.4 KiB
PHP
253 lines
9.4 KiB
PHP
<?php
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/*
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* $Id: MySQLTableInfo.php,v 1.20 2006/01/17 19:44:39 hlellelid Exp $
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information please see
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* <http://creole.phpdb.org>.
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*/
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require_once 'creole/metadata/TableInfo.php';
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/**
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* MySQL implementation of TableInfo.
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*
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* @author Hans Lellelid <hans@xmpl.org>
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* @version $Revision: 1.20 $
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* @package creole.drivers.mysql.metadata
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*/
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class MySQLTableInfo extends TableInfo {
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/** Loads the columns for this table. */
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protected function initColumns()
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{
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include_once 'creole/metadata/ColumnInfo.php';
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include_once 'creole/drivers/mysql/MySQLTypes.php';
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if (!@mysql_select_db($this->dbname, $this->conn->getResource())) {
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throw new SQLException('No database selected');
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}
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// To get all of the attributes we need, we use
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// the MySQL "SHOW COLUMNS FROM $tablename" SQL. We cannot
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// use the API functions (e.g. mysql_list_fields() because they
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// do not return complete information -- e.g. precision / scale, default
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// values).
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$res = mysql_query("SHOW COLUMNS FROM `" . $this->name . "`", $this->conn->getResource());
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$defaults = array();
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$nativeTypes = array();
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$precisions = array();
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while($row = mysql_fetch_assoc($res)) {
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$name = $row['Field'];
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$is_nullable = ($row['Null'] == 'YES');
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$is_auto_increment = (strpos($row['Extra'], 'auto_increment') !== false);
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$size = null;
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$precision = null;
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$scale = null;
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if (preg_match('/^(\w+)[\(]?([\d,]*)[\)]?( |$)/', $row['Type'], $matches)) {
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// colname[1] size/precision[2]
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$nativeType = $matches[1];
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if ($matches[2]) {
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if ( ($cpos = strpos($matches[2], ',')) !== false) {
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$size = (int) substr($matches[2], 0, $cpos);
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$precision = $size;
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$scale = (int) substr($matches[2], $cpos + 1);
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} else {
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$size = (int) $matches[2];
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}
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}
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} elseif (preg_match('/^(\w+)\(/', $row['Type'], $matches)) {
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$nativeType = $matches[1];
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} else {
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$nativeType = $row['Type'];
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}
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//BLOBs can't have any default values in MySQL
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$default = preg_match('~blob|text~', $nativeType) ? null : $row['Default'];
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$this->columns[$name] = new ColumnInfo($this,
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$name,
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MySQLTypes::getType($nativeType),
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$nativeType,
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$size,
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$precision,
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$scale,
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$is_nullable,
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$default,
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$is_auto_increment,
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$row);
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}
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$this->colsLoaded = true;
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}
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/** Loads the primary key information for this table. */
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protected function initPrimaryKey()
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{
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include_once 'creole/metadata/PrimaryKeyInfo.php';
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// columns have to be loaded first
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if (!$this->colsLoaded) $this->initColumns();
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if (!@mysql_select_db($this->dbname, $this->conn->getResource())) {
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throw new SQLException('No database selected');
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}
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// Primary Keys
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$res = mysql_query("SHOW KEYS FROM `" . $this->name . "`", $this->conn->getResource());
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// Loop through the returned results, grouping the same key_name together
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// adding each column for that key.
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while($row = mysql_fetch_assoc($res)) {
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// Skip any non-primary keys.
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if ($row['Key_name'] !== 'PRIMARY') {
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continue;
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}
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$name = $row["Column_name"];
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if (!isset($this->primaryKey)) {
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$this->primaryKey = new PrimaryKeyInfo($name, $row);
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}
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$this->primaryKey->addColumn($this->columns[$name]);
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}
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$this->pkLoaded = true;
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}
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/** Loads the indexes for this table. */
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protected function initIndexes() {
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include_once 'creole/metadata/IndexInfo.php';
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// columns have to be loaded first
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if (!$this->colsLoaded) $this->initColumns();
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if (!@mysql_select_db($this->dbname, $this->conn->getResource())) {
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throw new SQLException('No database selected');
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}
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// Indexes
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$res = mysql_query("SHOW INDEX FROM `" . $this->name . "`", $this->conn->getResource());
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// Loop through the returned results, grouping the same key_name together
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// adding each column for that key.
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while($row = mysql_fetch_assoc($res)) {
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$colName = $row["Column_name"];
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$name = $row["Key_name"];
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if($name == "PRIMARY") {
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continue;
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}
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if (!isset($this->indexes[$name])) {
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$isUnique = ($row["Non_unique"] == 0);
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$this->indexes[$name] = new IndexInfo($name, $isUnique, $row);
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}
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$this->indexes[$name]->addColumn($this->columns[$colName]);
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}
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$this->indexesLoaded = true;
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}
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/**
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* Load foreign keys for supporting versions of MySQL.
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* @author Tony Bibbs
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*/
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protected function initForeignKeys() {
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// First make sure we have supported version of MySQL:
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$res = mysql_query("SELECT VERSION()");
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$row = mysql_fetch_row($res);
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// Yes, it is OK to hardcode this...this was the first version of MySQL
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// that supported foreign keys
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if ($row[0] < '3.23.44') {
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$this->fksLoaded = true;
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return;
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}
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include_once 'creole/metadata/ForeignKeyInfo.php';
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// columns have to be loaded first
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if (!$this->colsLoaded) $this->initColumns();
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if (!@mysql_select_db($this->dbname, $this->conn->getResource())) {
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throw new SQLException('No database selected');
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}
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// Get the CREATE TABLE syntax
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$res = mysql_query("SHOW CREATE TABLE `" . $this->name . "`", $this->conn->getResource());
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$row = mysql_fetch_row($res);
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// Get the information on all the foreign keys
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$regEx = '/FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)(.*)/';
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if (preg_match_all($regEx,$row[1],$matches)) {
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$tmpArray = array_keys($matches[0]);
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foreach ($tmpArray as $curKey) {
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$name = $matches[1][$curKey];
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$ftbl = $matches[2][$curKey];
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$fcol = $matches[3][$curKey];
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$fkey = $matches[4][$curKey];
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if (!isset($this->foreignKeys[$name])) {
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$this->foreignKeys[$name] = new ForeignKeyInfo($name);
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if ($this->database->hasTable($ftbl)) {
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$foreignTable = $this->database->getTable($ftbl);
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} else {
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$foreignTable = new MySQLTableInfo($this->database, $ftbl);
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$this->database->addTable($foreignTable);
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}
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if ($foreignTable->hasColumn($fcol)) {
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$foreignCol = $foreignTable->getColumn($fcol);
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} else {
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$foreignCol = new ColumnInfo($foreignTable, $fcol);
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$foreignTable->addColumn($foreignCol);
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}
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//typical for mysql is RESTRICT
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$fkactions = array(
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'ON DELETE' => ForeignKeyInfo::RESTRICT,
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'ON UPDATE' => ForeignKeyInfo::RESTRICT,
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);
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if ($fkey) {
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//split foreign key information -> search for ON DELETE and afterwords for ON UPDATE action
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foreach (array_keys($fkactions) as $fkaction) {
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$result = NULL;
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preg_match('/' . $fkaction . ' (' . ForeignKeyInfo::CASCADE . '|' . ForeignKeyInfo::SETNULL . ')/', $fkey, $result);
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if ($result && is_array($result) && isset($result[1])) {
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$fkactions[$fkaction] = $result[1];
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}
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}
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}
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$this->foreignKeys[$name]->addReference($this->columns[$name], $foreignCol, $fkactions['ON DELETE'], $fkactions['ON UPDATE']);
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}
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}
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}
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$this->fksLoaded = true;
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}
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protected function initVendorSpecificInfo()
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{
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$res = mysql_query("SHOW TABLE STATUS LIKE '" . $this->name . "'", $this->conn->getResource());
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$this->vendorSpecificInfo = mysql_fetch_assoc($res);
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$this->vendorLoaded = true;
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}
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}
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