类 yii\db\mssql\Schema

                public function createColumnSchemaBuilder($type, $length = null)
{
    return Yii::createObject(ColumnSchemaBuilder::className(), [$type, $length, $this->db]);
}

            

                public function createQueryBuilder()
{
    return Yii::createObject(QueryBuilder::className(), [$this->db]);
}

            

                public function createSavepoint($name)
{
    $this->db->createCommand("SAVE TRANSACTION $name")->execute();
}

            

                protected function findColumns($table)
{
    $columnsTableName = 'INFORMATION_SCHEMA.COLUMNS';
    $whereSql = '[t1].[table_name] = ' . $this->db->quoteValue($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);
    $sql = <<<SQL
CT
].[column_name],
].[is_nullable],
E WHEN [t1].[data_type] IN ('char','varchar','nchar','nvarchar','binary','varbinary') THEN
CASE WHEN [t1].[character_maximum_length] = NULL OR [t1].[character_maximum_length] = -1 THEN
    [t1].[data_type]
ELSE
    [t1].[data_type] + '(' + LTRIM(RTRIM(CONVERT(CHAR,[t1].[character_maximum_length]))) + ')'
END
E
[t1].[data_type]
 AS 'data_type',
].[column_default],
UMNPROPERTY(OBJECT_ID([t1].[table_schema] + '.' + [t1].[table_name]), [t1].[column_name], 'IsIdentity') AS is_identity,
UMNPROPERTY(OBJECT_ID([t1].[table_schema] + '.' + [t1].[table_name]), [t1].[column_name], 'IsComputed') AS is_computed,
SELECT CONVERT(VARCHAR, [t2].[value])
OM [sys].[extended_properties] AS [t2]
ERE
t2].[class] = 1 AND
t2].[class_desc] = 'OBJECT_OR_COLUMN' AND
t2].[name] = 'MS_Description' AND
t2].[major_id] = OBJECT_ID([t1].[TABLE_SCHEMA] + '.' + [t1].[table_name]) AND
t2].[minor_id] = COLUMNPROPERTY(OBJECT_ID([t1].[TABLE_SCHEMA] + '.' + [t1].[TABLE_NAME]), [t1].[COLUMN_NAME], 'ColumnID')
s comment
 {$columnsTableName} AS [t1]
E {$whereSql}

    try {
        $columns = $this->db->createCommand($sql)->queryAll();
        if (empty($columns)) {
            return false;
        }
    } 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;
}

            

                protected function findForeignKeys($table)
{
    $object = $table->name;
    if ($table->schemaName !== null) {
        $object = $table->schemaName . '.' . $object;
    }
    if ($table->catalogName !== null) {
        $object = $table->catalogName . '.' . $object;
    }
    // please refer to the following page for more details:
    // http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
    $sql = <<<'SQL'
CT
].[name] AS [fk_name],
].[name] AS [fk_column_name],
ECT_NAME([fk].[referenced_object_id]) AS [uq_table_name],
].[name] AS [uq_column_name]

s].[foreign_keys] AS [fk]
ER JOIN [sys].[foreign_key_columns] AS [fkc] ON
k].[object_id] = [fkc].[constraint_object_id]
ER JOIN [sys].[columns] AS [cp] ON
k].[parent_object_id] = [cp].[object_id] AND
kc].[parent_column_id] = [cp].[column_id]
ER JOIN [sys].[columns] AS [cr] ON
k].[referenced_object_id] = [cr].[object_id] AND
kc].[referenced_column_id] = [cr].[column_id]
E
].[parent_object_id] = OBJECT_ID(:object)

    $rows = $this->db->createCommand($sql, [
        ':object' => $object,
    ])->queryAll();
    $table->foreignKeys = [];
    foreach ($rows as $row) {
        if (!isset($table->foreignKeys[$row['fk_name']])) {
            $table->foreignKeys[$row['fk_name']][] = $row['uq_table_name'];
        }
        $table->foreignKeys[$row['fk_name']][$row['fk_column_name']] = $row['uq_column_name'];
    }
}

            

                protected function findPrimaryKeys($table)
{
    $result = [];
    foreach ($this->findTableConstraints($table, 'PRIMARY KEY') as $row) {
        $result[] = $row['field_name'];
    }
    $table->primaryKey = $result;
}

            

                protected function findSchemaNames()
{
    static $sql = <<<'SQL'
CT [s].[name]
 [sys].[schemas] AS [s]
R JOIN [sys].[database_principals] AS [p] ON [p].[principal_id] = [s].[principal_id]
E [p].[is_fixed_role] = 0 AND [p].[sid] IS NOT NULL
R BY [s].[name] ASC

    return $this->db->createCommand($sql)->queryColumn();
}

            

                protected function findTableConstraints($table, $type)
{
    $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);
    $sql = <<<SQL
CT
[kcu].[constraint_name] AS [index_name],
[kcu].[column_name] AS [field_name]
 {$keyColumnUsageTableName} AS [kcu]
 JOIN {$tableConstraintsTableName} AS [tc] ON
[kcu].[table_schema] = [tc].[table_schema] AND
[kcu].[table_name] = [tc].[table_name] AND
[kcu].[constraint_name] = [tc].[constraint_name]
E
[tc].[constraint_type] = :type AND
[kcu].[table_name] = :tableName AND
[kcu].[table_schema] = :schemaName

    return $this->db
        ->createCommand($sql, [
            ':tableName' => $table->name,
            ':schemaName' => $table->schemaName,
            ':type' => $type,
        ])
        ->queryAll();
}

            

                protected function findTableNames($schema = '')
{
    if ($schema === '') {
        $schema = $this->defaultSchema;
    }
    $sql = <<<'SQL'
CT [t].[table_name]
 [INFORMATION_SCHEMA].[TABLES] AS [t]
E [t].[table_schema] = :schema AND [t].[table_type] IN ('BASE TABLE', 'VIEW')
R BY [t].[table_name]

    return $this->db->createCommand($sql, [':schema' => $schema])->queryColumn();
}

            

                public function findUniqueIndexes($table)
{
    $result = [];
    foreach ($this->findTableConstraints($table, 'UNIQUE') as $row) {
        $result[$row['index_name']][] = $row['field_name'];
    }
    return $result;
}

            

                protected function findViewNames($schema = '')
{
    if ($schema === '') {
        $schema = $this->defaultSchema;
    }
    $sql = <<<'SQL'
CT [t].[table_name]
 [INFORMATION_SCHEMA].[TABLES] AS [t]
E [t].[table_schema] = :schema AND [t].[table_type] = 'VIEW'
R BY [t].[table_name]

    return $this->db->createCommand($sql, [':schema' => $schema])->queryColumn();
}

            

                protected function getSchemaMetadata($schema, $type, $refresh)
{
    $metadata = [];
    $methodName = 'getTable' . ucfirst($type);
    $tableNames = array_map(function ($table) {
        return $this->quoteSimpleTableName($table);
    }, $this->getTableNames($schema, $refresh));
    foreach ($tableNames as $name) {
        if ($schema !== '') {
            $name = $schema . '.' . $name;
        }
        $tableMetadata = $this->$methodName($name, $refresh);
        if ($tableMetadata !== null) {
            $metadata[] = $tableMetadata;
        }
    }
    return $metadata;
}

            

                protected function getTableNameParts($name)
{
    $parts = [$name];
    preg_match_all('/([^.\[\]]+)|\[([^\[\]]+)\]/', $name, $matches);
    if (isset($matches[0]) && is_array($matches[0]) && !empty($matches[0])) {
        $parts = $matches[0];
    }
    $parts = str_replace(['[', ']'], '', $parts);
    return $parts;
}

            

                public function insert($table, $columns)
{
    $command = $this->db->createCommand()->insert($table, $columns);
    if (!$command->execute()) {
        return false;
    }
    $isVersion2005orLater = version_compare($this->db->getSchema()->getServerVersion(), '9', '>=');
    $inserted = $isVersion2005orLater ? $command->pdoStatement->fetch() : [];
    $tableSchema = $this->getTableSchema($table);
    $result = [];
    foreach ($tableSchema->primaryKey as $name) {
        // @see https://github.com/yiisoft/yii2/issues/13828 & https://github.com/yiisoft/yii2/issues/17474
        if (isset($inserted[$name])) {
            $result[$name] = $inserted[$name];
        } elseif ($tableSchema->columns[$name]->autoIncrement) {
            // for a version earlier than 2005
            $result[$name] = $this->getLastInsertID($tableSchema->sequenceName);
        } elseif (isset($columns[$name])) {
            $result[$name] = $columns[$name];
        } else {
            $result[$name] = $tableSchema->columns[$name]->defaultValue;
        }
    }
    return $result;
}

            

                protected function loadColumnSchema($info)
{
    $isVersion2017orLater = version_compare($this->db->getSchema()->getServerVersion(), '14', '>=');
    $column = $this->createColumnSchema();
    $column->name = $info['column_name'];
    $column->allowNull = $info['is_nullable'] === 'YES';
    $column->dbType = $info['data_type'];
    $column->enumValues = []; // mssql has only vague equivalents to enum
    $column->isPrimaryKey = null; // primary key will be determined in findColumns() method
    $column->autoIncrement = $info['is_identity'] == 1;
    $column->isComputed = (bool)$info['is_computed'];
    $column->unsigned = stripos($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 ($isVersion2017orLater && $type === 'bit') {
            $column->type = 'boolean';
        }
        if (!empty($matches[2])) {
            $values = explode(',', $matches[2]);
            $column->size = $column->precision = (int) $values[0];
            if (isset($values[1])) {
                $column->scale = (int) $values[1];
            }
            if ($isVersion2017orLater === false) {
                $column->type = $this->booleanTypeLegacy($column->size, $type);
            }
        }
    }
    $column->phpType = $this->getColumnPhpType($column);
    if ($info['column_default'] === '(NULL)') {
        $info['column_default'] = null;
    }
    if (!$column->isPrimaryKey && ($column->type !== 'timestamp' || $info['column_default'] !== 'CURRENT_TIMESTAMP')) {
        $column->defaultValue = $column->defaultPhpTypecast($info['column_default']);
    }
    return $column;
}

            

                protected function loadTableChecks($tableName)
{
    return $this->loadTableConstraints($tableName, 'checks');
}

            

                protected function loadTableDefaultValues($tableName)
{
    return $this->loadTableConstraints($tableName, 'defaults');
}

            

                protected function loadTableForeignKeys($tableName)
{
    return $this->loadTableConstraints($tableName, 'foreignKeys');
}

            

                protected function loadTableIndexes($tableName)
{
    static $sql = <<<'SQL'
CT
[i].[name] AS [name],
[iccol].[name] AS [column_name],
[i].[is_unique] AS [index_is_unique],
[i].[is_primary_key] AS [index_is_primary]
 [sys].[indexes] AS [i]
R JOIN [sys].[index_columns] AS [ic]
ON [ic].[object_id] = [i].[object_id] AND [ic].[index_id] = [i].[index_id]
R JOIN [sys].[columns] AS [iccol]
ON [iccol].[object_id] = [ic].[object_id] AND [iccol].[column_id] = [ic].[column_id]
E [i].[object_id] = OBJECT_ID(:fullName)
R BY [ic].[key_ordinal] ASC

    $resolvedName = $this->resolveTableName($tableName);
    $indexes = $this->db->createCommand($sql, [
        ':fullName' => $resolvedName->fullName,
    ])->queryAll();
    $indexes = $this->normalizePdoRowKeyCase($indexes, true);
    $indexes = ArrayHelper::index($indexes, null, 'name');
    $result = [];
    foreach ($indexes as $name => $index) {
        $result[] = new IndexConstraint([
            'isPrimary' => (bool)$index[0]['index_is_primary'],
            'isUnique' => (bool)$index[0]['index_is_unique'],
            'name' => $name,
            'columnNames' => ArrayHelper::getColumn($index, 'column_name'),
        ]);
    }
    return $result;
}

            

                protected function loadTablePrimaryKey($tableName)
{
    return $this->loadTableConstraints($tableName, 'primaryKey');
}

            

                protected function loadTableSchema($name)
{
    $table = new TableSchema();
    $this->resolveTableNames($table, $name);
    $this->findPrimaryKeys($table);
    if ($this->findColumns($table)) {
        $this->findForeignKeys($table);
        return $table;
    }
    return null;
}

            

                protected function loadTableUniques($tableName)
{
    return $this->loadTableConstraints($tableName, 'uniques');
}

            

                public function quoteColumnName($name)
{
    if (preg_match('/^\[.*\]$/', $name)) {
        return $name;
    }
    return parent::quoteColumnName($name);
}

            

                public function releaseSavepoint($name)
{
    // does nothing as MSSQL does not support this
}

            

                protected function resolveTableName($name)
{
    $resolvedName = new TableSchema();
    $parts = $this->getTableNameParts($name);
    $partCount = count($parts);
    if ($partCount === 4) {
        // server name, catalog name, schema name and table name passed
        $resolvedName->catalogName = $parts[1];
        $resolvedName->schemaName = $parts[2];
        $resolvedName->name = $parts[3];
        $resolvedName->fullName = $resolvedName->catalogName . '.' . $resolvedName->schemaName . '.' . $resolvedName->name;
    } elseif ($partCount === 3) {
        // catalog name, schema name and table name passed
        $resolvedName->catalogName = $parts[0];
        $resolvedName->schemaName = $parts[1];
        $resolvedName->name = $parts[2];
        $resolvedName->fullName = $resolvedName->catalogName . '.' . $resolvedName->schemaName . '.' . $resolvedName->name;
    } elseif ($partCount === 2) {
        // only schema name and table name passed
        $resolvedName->schemaName = $parts[0];
        $resolvedName->name = $parts[1];
        $resolvedName->fullName = ($resolvedName->schemaName !== $this->defaultSchema ? $resolvedName->schemaName . '.' : '') . $resolvedName->name;
    } else {
        // only table name passed
        $resolvedName->schemaName = $this->defaultSchema;
        $resolvedName->fullName = $resolvedName->name = $parts[0];
    }
    return $resolvedName;
}

            

                protected function resolveTableNames($table, $name)
{
    $parts = $this->getTableNameParts($name);
    $partCount = count($parts);
    if ($partCount === 4) {
        // server name, catalog name, schema name and table name passed
        $table->catalogName = $parts[1];
        $table->schemaName = $parts[2];
        $table->name = $parts[3];
        $table->fullName = $table->catalogName . '.' . $table->schemaName . '.' . $table->name;
    } elseif ($partCount === 3) {
        // catalog name, schema name and table name passed
        $table->catalogName = $parts[0];
        $table->schemaName = $parts[1];
        $table->name = $parts[2];
        $table->fullName = $table->catalogName . '.' . $table->schemaName . '.' . $table->name;
    } elseif ($partCount === 2) {
        // only schema name and table name passed
        $table->schemaName = $parts[0];
        $table->name = $parts[1];
        $table->fullName = $table->schemaName !== $this->defaultSchema ? $table->schemaName . '.' . $table->name : $table->name;
    } else {
        // only table name passed
        $table->schemaName = $this->defaultSchema;
        $table->fullName = $table->name = $parts[0];
    }
}

            

                public function rollBackSavepoint($name)
{
    $this->db->createCommand("ROLLBACK TRANSACTION $name")->execute();
}