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<?php
/**
* Load the base TDbMetaData class.
*/
Prado::using('System.Data.Common.TDbMetaData');
Prado::using('System.Data.Common.Mysql.TMysqlTableInfo');
class TMysqlMetaData extends TDbMetaData
{
/**
* Get the column definitions for given table.
* @param string table name.
* @return TMysqlTableInfo table information.
*/
protected function createTableInfo($table)
{
$this->getDbConnection()->setActive(true);
$sql = "SHOW FULL FIELDS FROM {$table}";
$command = $this->getDbConnection()->createCommand($sql);
$tableInfo = $this->createNewTableInfo($table);
$index=0;
foreach($command->query() as $col)
{
$col['index'] = $index++;
$this->processColumn($tableInfo,$col);
}
return $tableInfo;
}
/**
* @param TMysqlTableInfo table information.
* @param array column information.
*/
protected function processColumn($tableInfo, $col)
{
$columnId = $col['Field'];
$info['ColumnName'] = "`$columnId`"; //quote the column names!
$info['ColumnIndex'] = $col['index'];
if($col['Null']!=='NO')
$info['AllowNull'] = true;
if(is_int(strpos(strtolower($col['Extra']), 'auto_increment')))
$info['AutoIncrement']=true;
if($col['Default']!=="")
$info['DefaultValue'] = $col['Default'];
if($col['Key']==='PRI' || in_array($columnId, $tableInfo->getPrimaryKeys()))
$info['IsPrimaryKey'] = true;
if($this->isForeignKeyColumn($columnId, $tableInfo))
$info['IsForeignKey'] = true;
$info['DbType'] = $col['Type'];
$match=array();
//find SET/ENUM values, column size, precision, and scale
if(preg_match('/\((.*)\)/', $col['Type'], $match))
{
$info['DbType']= preg_replace('/\(.*\)/', '', $col['Type']);
//find SET/ENUM values
if($this->isEnumSetType($info['DbType']))
$info['DbTypeValues'] = preg_split('/\s*,\s*|\s+/', preg_replace('/\'|"/', '', $match[1]));
//find column size, precision and scale
$pscale = array();
if(preg_match('/(\d+)(?:,(\d+))?+/', $match[1], $pscale))
{
if($this->isPrecisionType($info['DbType']))
{
$info['NumericPrecision'] = intval($pscale[1]);
if(count($pscale) > 2)
$info['NumericScale'] = intval($pscale[2]);
}
else
$info['ColumnSize'] = intval($pscale[1]);
}
}
$tableInfo->Columns[$columnId] = new TMysqlTableColumn($info);
}
/**
* @return boolean true if column type if "numeric", "interval" or begins with "time".
*/
protected function isPrecisionType($type)
{
$type = strtolower(trim($type));
return $type==='decimal' || $type==='dec'
|| $type==='float' || $type==='double'
|| $type==='double precision' || $type==='real';
}
/**
* @return boolean true if column type if "enum" or "set".
*/
protected function isEnumSetType($type)
{
$type = strtolower(trim($type));
return $type==='set' || $type==='enum';
}
/**
* @param string table name, may be quoted with back-ticks and may contain database name.
* @return array tuple ($schema,$table), $schema may be null.
* @throws TDbException when table name contains invalid identifier bytes.
*/
protected function getSchemaTableName($table)
{
//remove the back ticks and separate out the "database.table"
$result = explode('.', str_replace('`', '', $table));
foreach($result as $name)
{
if(!$this->isValidIdentifier($name))
{
$ref = 'http://dev.mysql.com/doc/refman/5.0/en/identifiers.html';
throw new TDbException('dbcommon_invalid_identifier_name', $table, $ref);
}
}
return count($result) > 1 ? $result : array(null, $result[0]);
}
/**
* http://dev.mysql.com/doc/refman/5.0/en/identifiers.html
* @param unknown_type $name
*/
protected function isValidIdentifier($name)
{
return !preg_match('#/|\\|.|\x00|\xFF#', $name);
}
/**
* @param string table schema name
* @param string table name.
* @return TMysqlTableInfo
*/
protected function createNewTableInfo($table)
{
list($schemaName,$tableName) = $this->getSchemaTableName($table);
$info['SchemaName'] = $schemaName;
$info['TableName'] = $tableName;
$info['IsView'] = $this->getIsView($schemaName,$tableName);
list($primary, $foreign) = $this->getConstraintKeys($schemaName, $tableName);
return new TMysqlTableInfo($info,$primary,$foreign);
}
/**
* @param string database name, null to use default connection database.
* @param string table or view name.
* @return boolean true if is view, false otherwise.
* @throws TDbException if table or view does not exist.
*/
protected function getIsView($schemaName,$tableName)
{
if($schemaName!==null)
$sql = "SHOW FULL TABLES FROM `{$schemaName}` LIKE :table";
else
$sql = 'SHOW FULL TABLES LIKE :table';
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $tableName);
try
{
return count($result = $command->queryRow()) > 0 && $result['Table_type']==='VIEW';
}
catch(TDbException $e)
{
$table = $schemaName===null?$tableName:$schemaName.'.'.$tableName;
throw new TDbException('dbcommon_invalid_table_name',$table,$e->getMessage());
}
}
/**
* Gets the primary and foreign key column details for the given table.
* @param string schema name
* @param string table name.
* @return array tuple ($primary, $foreign)
*/
protected function getConstraintKeys($schemaName, $tableName)
{
$table = $schemaName===null ? "`{$tableName}`" : "`{$schemaName}`.`{$tableName}`";
$sql = "SHOW INDEX FROM {$table}";
$command = $this->getDbConnection()->createCommand($sql);
$primary = array();
$foreign = $this->getForeignConstraints($schemaName,$tableName);
foreach($command->query() as $row)
{
if($row['Key_name']==='PRIMARY')
$primary[] = $row['Column_name'];
}
return array($primary,$foreign);
}
/**
* Gets foreign relationship constraint keys and table name
* @param string database name
* @param string table name
* @return array foreign relationship table name and keys.
*/
protected function getForeignConstraints($schemaName, $tableName)
{
$andSchema = $schemaName !== null ? 'AND TABLE_SCHEMA = :schema' : '';
$sql = <<<EOD
SELECT
CONSTRAINT_NAME as con,
COLUMN_NAME as col,
REFERENCED_TABLE_SCHEMA as fkschema,
REFERENCED_TABLE_NAME as fktable,
REFERENCED_COLUMN_NAME as fkcol
FROM
`INFORMATION_SCHEMA`.`KEY_COLUMN_USAGE`
WHERE
REFERENCED_TABLE_NAME IS NOT NULL
AND TABLE_NAME = :table
$andSchema
EOD;
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $tableName);
if($schemaName!==null)
$command->bindValue(':schema', $schemaName);
$fkeys=array();
foreach($command->query() as $col)
{
$fkeys[$col['con']]['keys'][$col['col']] = $col['fkcol'];
$fkeys[$col['con']]['table'] = "`{$col['fkschema']}`.`{$col['fktable']}`";
}
return count($fkeys) > 0 ? array_values($fkeys) : $fkeys;
}
/**
* @param string column name.
* @param TPgsqlTableInfo table information.
* @return boolean true if column is a foreign key.
*/
protected function isForeignKeyColumn($columnId, $tableInfo)
{
foreach($tableInfo->getForeignKeys() as $fk)
{
if(in_array($columnId, array_keys($fk['keys'])))
return true;
}
return false;
}
}
?>
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