YII 类库手册

public function addColumn($table, $column, $type)
{
    $type=$this->getColumnType($type);
    $sql='ALTER TABLE ' . $this->quoteTableName($table)
        . ' ADD COLUMN ' . $this->quoteColumnName($column) . ' '
        . $this->getColumnType($type);
    return $sql;
}

public function alterColumn($table, $column, $type)
{
    $type=$this->getColumnType($type);
    $sql='ALTER TABLE ' . $this->quoteTableName($table) . ' ALTER COLUMN '
        . $this->quoteColumnName($column) . ' TYPE ' . $this->getColumnType($type);
    return $sql;
}

public function checkIntegrity($check=true,$schema='')
{
    $enable=$check ? 'ENABLE' : 'DISABLE';
    $tableNames=$this->getTableNames($schema);
    $db=$this->getDbConnection();
    foreach($tableNames as $tableName)
    {
        $tableName='"'.$tableName.'"';
        if(strpos($tableName,'.')!==false)
            $tableName=str_replace('.','"."',$tableName);
        $db->createCommand("ALTER TABLE $tableName $enable TRIGGER ALL")->execute();
    }
}

protected function createColumn($column)
{
    $c=new CPgsqlColumnSchema;
    $c->name=$column['attname'];
    $c->rawName=$this->quoteColumnName($c->name);
    $c->allowNull=!$column['attnotnull'];
    $c->isPrimaryKey=false;
    $c->isForeignKey=false;

    $c->init($column['type'],$column['atthasdef'] ? $column['adsrc'] : null);

    return $c;
}

public function dropIndex($name, $table)
{
    return 'DROP INDEX '.$this->quoteTableName($name);
}

protected function findColumns($table)
{
    $sql=<<<EOD
SELECT a.attname, LOWER(format_type(a.atttypid, a.atttypmod)) AS type, d.adsrc, a.attnotnull, a.atthasdef
FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attnum > 0 AND NOT a.attisdropped
AND a.attrelid = (SELECT oid FROM pg_catalog.pg_class WHERE relname=:table
    AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = :schema))
ORDER BY a.attnum
EOD;
    $command=$this->getDbConnection()->createCommand($sql);
    $command->bindValue(':table',$table->name);
    $command->bindValue(':schema',$table->schemaName);

    if(($columns=$command->queryAll())===array())
        return false;

    foreach($columns as $column)
    {
        $c=$this->createColumn($column);
        $table->columns[$c->name]=$c;

        if(stripos($column['adsrc'],'nextval')===0 && preg_match('/nextval\([^\']*\'([^\']+)\'[^\)]*\)/i',$column['adsrc'],$matches))
        {
            if(strpos($matches[1],'.')!==false || $table->schemaName===self::DEFAULT_SCHEMA)
                $this->_sequences[$table->rawName.'.'.$c->name]=$matches[1];
            else
                $this->_sequences[$table->rawName.'.'.$c->name]=$table->schemaName.'.'.$matches[1];
            $c->autoIncrement=true;
        }
    }
    return true;
}

protected function findConstraints($table)
{
    $sql=<<<EOD
SELECT conname, consrc, contype, indkey FROM (
SELECT
    conname,
    CASE WHEN contype='f' THEN
        pg_catalog.pg_get_constraintdef(oid)
    ELSE
        'CHECK (' || consrc || ')'
    END AS consrc,
    contype,
    conrelid AS relid,
    NULL AS indkey
FROM
    pg_catalog.pg_constraint
WHERE
    contype IN ('f', 'c')
UNION ALL
SELECT
    pc.relname,
    NULL,
    CASE WHEN indisprimary THEN
            'p'
    ELSE
            'u'
    END,
    pi.indrelid,
    indkey
FROM
    pg_catalog.pg_class pc,
    pg_catalog.pg_index pi
WHERE
    pc.oid=pi.indexrelid
    AND EXISTS (
        SELECT 1 FROM pg_catalog.pg_depend d JOIN pg_catalog.pg_constraint c
        ON (d.refclassid = c.tableoid AND d.refobjid = c.oid)
        WHERE d.classid = pc.tableoid AND d.objid = pc.oid AND d.deptype = 'i' AND c.contype IN ('u', 'p')
)
) AS sub
WHERE relid = (SELECT oid FROM pg_catalog.pg_class WHERE relname=:table
AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace
WHERE nspname=:schema))
EOD;
    $command=$this->getDbConnection()->createCommand($sql);
    $command->bindValue(':table',$table->name);
    $command->bindValue(':schema',$table->schemaName);
    foreach($command->queryAll() as $row)
    {
        if($row['contype']==='p') // primary key
            $this->findPrimaryKey($table,$row['indkey']);
        else if($row['contype']==='f') // foreign key
            $this->findForeignKey($table,$row['consrc']);
    }
}

protected function findForeignKey($table,$src)
{
    $matches=array();
    $brackets='\(([^\)]+)\)';
    $pattern="/FOREIGN\s+KEY\s+{$brackets}\s+REFERENCES\s+([^\(]+){$brackets}/i";
    if(preg_match($pattern,str_replace('"','',$src),$matches))
    {
        $keys=preg_split('/,\s+/', $matches[1]);
        $tableName=$matches[2];
        $fkeys=preg_split('/,\s+/', $matches[3]);
        foreach($keys as $i=>$key)
        {
            $table->foreignKeys[$key]=array($tableName,$fkeys[$i]);
            if(isset($table->columns[$key]))
                $table->columns[$key]->isForeignKey=true;
        }
    }
}

protected function findPrimaryKey($table,$indices)
{
    $indices=implode(', ',preg_split('/\s+/',$indices));
    $sql=<<<EOD
SELECT attnum, attname FROM pg_catalog.pg_attribute WHERE
attrelid=(
    SELECT oid FROM pg_catalog.pg_class WHERE relname=:table AND relnamespace=(
        SELECT oid FROM pg_catalog.pg_namespace WHERE nspname=:schema
    )
)
AND attnum IN ({$indices})
EOD;
    $command=$this->getDbConnection()->createCommand($sql);
    $command->bindValue(':table',$table->name);
    $command->bindValue(':schema',$table->schemaName);
    foreach($command->queryAll() as $row)
    {
        $name=$row['attname'];
        if(isset($table->columns[$name]))
        {
            $table->columns[$name]->isPrimaryKey=true;
            if($table->primaryKey===null)
                $table->primaryKey=$name;
            else if(is_string($table->primaryKey))
                $table->primaryKey=array($table->primaryKey,$name);
            else
                $table->primaryKey[]=$name;
        }
    }
}

protected function findTableNames($schema='')
{
    if($schema==='')
        $schema=self::DEFAULT_SCHEMA;
    $sql=<<<EOD
SELECT table_name, table_schema FROM information_schema.tables
WHERE table_schema=:schema AND table_type='BASE TABLE'
EOD;
    $command=$this->getDbConnection()->createCommand($sql);
    $command->bindParam(':schema',$schema);
    $rows=$command->queryAll();
    $names=array();
    foreach($rows as $row)
    {
        if($schema===self::DEFAULT_SCHEMA)
            $names[]=$row['table_name'];
        else
            $names[]=$row['table_schema'].'.'.$row['table_name'];
    }
    return $names;
}

protected function loadTable($name)
{
    $table=new CPgsqlTableSchema;
    $this->resolveTableNames($table,$name);
    if(!$this->findColumns($table))
        return null;
    $this->findConstraints($table);

    if(is_string($table->primaryKey) && isset($this->_sequences[$table->rawName.'.'.$table->primaryKey]))
        $table->sequenceName=$this->_sequences[$table->rawName.'.'.$table->primaryKey];
    else if(is_array($table->primaryKey))
    {
        foreach($table->primaryKey as $pk)
        {
            if(isset($this->_sequences[$table->rawName.'.'.$pk]))
            {
                $table->sequenceName=$this->_sequences[$table->rawName.'.'.$pk];
                break;
            }
        }
    }

    return $table;
}

public function quoteSimpleTableName($name)
{
    return '"'.$name.'"';
}

public function renameTable($table, $newName)
{
    return 'ALTER TABLE ' . $this->quoteTableName($table) . ' RENAME TO ' . $this->quoteTableName($newName);
}

public function resetSequence($table,$value=null)
{
    if($table->sequenceName!==null)
    {
        $seq='"'.$table->sequenceName.'"';
        if(strpos($seq,'.')!==false)
            $seq=str_replace('.','"."',$seq);
        if($value===null)
            $value="(SELECT COALESCE(MAX(\"{$table->primaryKey}\"),0) FROM {$table->rawName}) + 1";
        else
            $value=(int)$value;
        $this->getDbConnection()->createCommand("SELECT SETVAL('$seq', $value, false)")->execute();
    }
}

protected function resolveTableNames($table,$name)
{
    $parts=explode('.',str_replace('"','',$name));
    if(isset($parts[1]))
    {
        $schemaName=$parts[0];
        $tableName=$parts[1];
    }
    else
    {
        $schemaName=self::DEFAULT_SCHEMA;
        $tableName=$parts[0];
    }

    $table->name=$tableName;
    $table->schemaName=$schemaName;
    if($schemaName===self::DEFAULT_SCHEMA)
        $table->rawName=$this->quoteTableName($tableName);
    else
        $table->rawName=$this->quoteTableName($schemaName).'.'.$this->quoteTableName($tableName);
}