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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\mssql;
use yii\db\TableSchema;
use yii\db\ColumnSchema;
/**
* Schema is the class for retrieving metadata from a MS SQL Server databases (version 2008 and above).
*
* @author Timur Ruziev <resurtm@gmail.com>
* @since 2.0
*/
class Schema extends \yii\db\Schema
{
/**
* Default schema name to be used.
*/
const DEFAULT_SCHEMA = 'dbo';
/**
* @var array mapping from physical column types (keys) to abstract column types (values)
*/
public $typeMap = array(
// exact numerics
'bigint' => self::TYPE_BIGINT,
'numeric' => self::TYPE_DECIMAL,
'bit' => self::TYPE_SMALLINT,
'smallint' => self::TYPE_SMALLINT,
'decimal' => self::TYPE_DECIMAL,
'smallmoney' => self::TYPE_MONEY,
'int' => self::TYPE_INTEGER,
'tinyint' => self::TYPE_SMALLINT,
'money' => self::TYPE_MONEY,
// approximate numerics
'float' => self::TYPE_FLOAT,
'real' => self::TYPE_FLOAT,
// date and time
'date' => self::TYPE_DATE,
'datetimeoffset' => self::TYPE_DATETIME,
'datetime2' => self::TYPE_DATETIME,
'smalldatetime' => self::TYPE_DATETIME,
'datetime' => self::TYPE_DATETIME,
'time' => self::TYPE_TIME,
// character strings
'char' => self::TYPE_STRING,
'varchar' => self::TYPE_STRING,
'text' => self::TYPE_TEXT,
// unicode character strings
'nchar' => self::TYPE_STRING,
'nvarchar' => self::TYPE_STRING,
'ntext' => self::TYPE_TEXT,
// binary strings
'binary' => self::TYPE_BINARY,
'varbinary' => self::TYPE_BINARY,
'image' => self::TYPE_BINARY,
// other data types
// 'cursor' type cannot be used with tables
'timestamp' => self::TYPE_TIMESTAMP,
'hierarchyid' => self::TYPE_STRING,
'uniqueidentifier' => self::TYPE_STRING,
'sql_variant' => self::TYPE_STRING,
'xml' => self::TYPE_STRING,
'table' => self::TYPE_STRING,
);
/**
* Quotes a table name for use in a query.
* A simple table name has no schema prefix.
* @param string $name table name.
* @return string the properly quoted table name.
*/
public function quoteSimpleTableName($name)
{
return strpos($name, '[') === false ? "[{$name}]" : $name;
}
/**
* Quotes a column name for use in a query.
* A simple column name has no prefix.
* @param string $name column name.
* @return string the properly quoted column name.
*/
public function quoteSimpleColumnName($name)
{
return strpos($name, '[') === false && $name !== '*' ? "[{$name}]" : $name;
}
/**
* Creates a query builder for the MSSQL database.
* @return QueryBuilder query builder interface.
*/
public function createQueryBuilder()
{
return new QueryBuilder($this->db);
}
/**
* Loads the metadata for the specified table.
* @param string $name table name
* @return TableSchema|null driver dependent table metadata. Null if the table does not exist.
*/
public function loadTableSchema($name)
{
$table = new TableSchema();
$this->resolveTableNames($table, $name);
$this->findPrimaryKeys($table);
if ($this->findColumns($table)) {
$this->findForeignKeys($table);
return $table;
}
}
/**
* Resolves the table name and schema name (if any).
* @param TableSchema $table the table metadata object
* @param string $name the table name
*/
protected function resolveTableNames($table, $name)
{
$parts = explode('.', str_replace(array('[', ']'), '', $name));
$partCount = count($parts);
if ($partCount == 3) {
// catalog name, schema name and table name passed
$table->catalogName = $parts[0];
$table->schemaName = $parts[1];
$table->name = $parts[2];
} elseif ($partCount == 2) {
// only schema name and table name passed
$table->schemaName = $parts[0];
$table->name = $parts[1];
} else {
// only schema name passed
$table->schemaName = static::DEFAULT_SCHEMA;
$table->name = $parts[0];
}
}
/**
* Loads the column information into a [[ColumnSchema]] object.
* @param array $info column information
* @return ColumnSchema the column schema object
*/
protected function loadColumnSchema($info)
{
$column = new ColumnSchema();
$column->name = $info['column_name'];
$column->allowNull = $info['is_nullable'] == 'YES';
$column->dbType = $info['data_type'];
$column->enumValues = array(); // mssql has only vague equivalents to enum
$column->isPrimaryKey = null; // primary key will be determined in findColumns() method
$column->autoIncrement = $info['is_identity'] == 1;
$column->unsigned = stripos($column->dbType, 'unsigned') !== false;
$column->comment = $info['comment'] === null ? '' : $info['comment'];
$column->type = self::TYPE_STRING;
if (preg_match('/^(\w+)(?:\(([^\)]+)\))?/', $column->dbType, $matches)) {
$type = $matches[1];
if (isset($this->typeMap[$type])) {
$column->type = $this->typeMap[$type];
}
if (!empty($matches[2])) {
$values = explode(',', $matches[2]);
$column->size = $column->precision = (int)$values[0];
if (isset($values[1])) {
$column->scale = (int)$values[1];
}
if ($column->size === 1 && ($type === 'tinyint' || $type === 'bit')) {
$column->type = 'boolean';
} elseif ($type === 'bit') {
if ($column->size > 32) {
$column->type = 'bigint';
} elseif ($column->size === 32) {
$column->type = 'integer';
}
}
}
}
$column->phpType = $this->getColumnPhpType($column);
if ($info['column_default'] == '(NULL)') {
$info['column_default'] = null;
}
if ($column->type !== 'timestamp' || $info['column_default'] !== 'CURRENT_TIMESTAMP') {
$column->defaultValue = $column->typecast($info['column_default']);
}
return $column;
}
/**
* Collects the metadata of table columns.
* @param TableSchema $table the table metadata
* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
$columnsTableName = 'information_schema.columns';
$whereSql = "[t1].[table_name] = '{$table->name}'";
if ($table->catalogName !== null) {
$columnsTableName = "{$table->catalogName}.{$columnsTableName}";
$whereSql .= " AND [t1].[table_catalog] = '{$table->catalogName}'";
}
if ($table->schemaName !== null) {
$whereSql .= " AND [t1].[table_schema] = '{$table->schemaName}'";
}
$columnsTableName = $this->quoteTableName($columnsTableName);
$sql = <<<SQL
SELECT
[t1].[column_name], [t1].[is_nullable], [t1].[data_type], [t1].[column_default],
COLUMNPROPERTY(OBJECT_ID([t1].[table_schema] + '.' + [t1].[table_name]), [t1].[column_name], 'IsIdentity') AS is_identity,
CONVERT(VARCHAR, [t2].[value]) AS comment
FROM {$columnsTableName} AS [t1]
LEFT OUTER JOIN [sys].[extended_properties] AS [t2] ON
[t1].[ordinal_position] = [t2].[minor_id] AND
OBJECT_NAME([t2].[major_id]) = [t1].[table_name] AND
[t2].[class] = 1 AND
[t2].[class_desc] = 'OBJECT_OR_COLUMN' AND
[t2].[name] = 'MS_Description'
WHERE {$whereSql}
SQL;
try {
$columns = $this->db->createCommand($sql)->queryAll();
} catch (\Exception $e) {
return false;
}
foreach ($columns as $column) {
$column = $this->loadColumnSchema($column);
foreach ($table->primaryKey as $primaryKey) {
if (strcasecmp($column->name, $primaryKey) === 0) {
$column->isPrimaryKey = true;
break;
}
}
if ($column->isPrimaryKey && $column->autoIncrement) {
$table->sequenceName = '';
}
$table->columns[$column->name] = $column;
}
return true;
}
/**
* Collects the primary key column details for the given table.
* @param TableSchema $table the table metadata
*/
protected function findPrimaryKeys($table)
{
$keyColumnUsageTableName = 'information_schema.key_column_usage';
$tableConstraintsTableName = 'information_schema.table_constraints';
if ($table->catalogName !== null) {
$keyColumnUsageTableName = $table->catalogName . '.' . $keyColumnUsageTableName;
$tableConstraintsTableName = $table->catalogName . '.' . $tableConstraintsTableName;
}
$keyColumnUsageTableName = $this->quoteTableName($keyColumnUsageTableName);
$tableConstraintsTableName = $this->quoteTableName($tableConstraintsTableName);
$sql = <<<SQL
SELECT
[kcu].[column_name] AS [field_name]
FROM {$keyColumnUsageTableName} AS [kcu]
LEFT JOIN {$tableConstraintsTableName} AS [tc] ON
[kcu].[table_name] = [tc].[table_name] AND
[kcu].[constraint_name] = [tc].[constraint_name]
WHERE
[tc].[constraint_type] = 'PRIMARY KEY' AND
[kcu].[table_name] = :tableName AND
[kcu].[table_schema] = :schemaName
SQL;
$table->primaryKey = $this->db
->createCommand($sql, array(':tableName' => $table->name, ':schemaName' => $table->schemaName))
->queryColumn();
}
/**
* Collects the foreign key column details for the given table.
* @param TableSchema $table the table metadata
*/
protected function findForeignKeys($table)
{
$referentialConstraintsTableName = 'information_schema.referential_constraints';
$keyColumnUsageTableName = 'information_schema.key_column_usage';
if ($table->catalogName !== null) {
$referentialConstraintsTableName = $table->catalogName . '.' . $referentialConstraintsTableName;
$keyColumnUsageTableName = $table->catalogName . '.' . $keyColumnUsageTableName;
}
$referentialConstraintsTableName = $this->quoteTableName($referentialConstraintsTableName);
$keyColumnUsageTableName = $this->quoteTableName($keyColumnUsageTableName);
// please refer to the following page for more details:
// http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
$sql = <<<SQL
SELECT
[kcu1].[column_name] AS [fk_column_name],
[kcu2].[table_name] AS [uq_table_name],
[kcu2].[column_name] AS [uq_column_name]
FROM {$referentialConstraintsTableName} AS [rc]
JOIN {$keyColumnUsageTableName} AS [kcu1] ON
[kcu1].[constraint_catalog] = [rc].[constraint_catalog] AND
[kcu1].[constraint_schema] = [rc].[constraint_schema] AND
[kcu1].[constraint_name] = [rc].[constraint_name]
JOIN {$keyColumnUsageTableName} AS [kcu2] ON
[kcu2].[constraint_catalog] = [rc].[constraint_catalog] AND
[kcu2].[constraint_schema] = [rc].[constraint_schema] AND
[kcu2].[constraint_name] = [rc].[constraint_name] AND
[kcu2].[ordinal_position] = [kcu1].[ordinal_position]
WHERE [kcu1].[table_name] = :tableName
SQL;
$rows = $this->db->createCommand($sql, array(':tableName' => $table->name))->queryAll();
$table->foreignKeys = array();
foreach ($rows as $row) {
$table->foreignKeys[] = array($row['uq_table_name'], $row['fk_column_name'] => $row['uq_column_name']);
}
}
/**
* Returns all table names in the database.
* This method should be overridden by child classes in order to support this feature
* because the default implementation simply throws an exception.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
* @return array all table names in the database. The names have NO the schema name prefix.
*/
protected function findTableNames($schema = '')
{
if ($schema === '') {
$schema = static::DEFAULT_SCHEMA;
}
$sql = <<<SQL
SELECT [t].[table]
FROM [information_schema].[tables] AS [t]
WHERE [t].[table_schema] = :schema AND [t].[table_type] = 'BASE TABLE'
SQL;
$names = $this->db->createCommand($sql, array(':schema' => $schema))->queryColumn();
if ($schema !== static::DEFAULT_SCHEMA) {
foreach ($names as $index => $name) {
$names[$index] = $schema . '.' . $name;
}
}
return $names;
}
}