Schema

API reference › yii › db › mysql › Schema

class	`yii\db\mysql\Schema`
Extends	`yii\db\Schema` » `yii\base\BaseObject`
Implements	`yii\db\ConstraintFinderInterface`, `yii\base\Configurable`
Uses traits	`yii\db\ConstraintFinderTrait`
Since	2.0
Source	`framework/db/mysql/Schema.php`

Schema is the class for retrieving metadata from a MySQL database (version 8.0 and later).

Properties

Property	Type	Description	Defined by
`$columnSchemaClass`	`class-string<yii\db\T>\|array{class?: class-string<yii\db\T>, __class?: class-string<yii\db\T>}`	Default: `'yii\db\mysql\ColumnSchema'`. Available since 2.0.11.	`Schema`
`$db`	`yii\db\Connection`	The database connection Default: `null`.	`yii\db\Schema`
`$defaultSchema`	`string`	The default schema name used for the current session. Default: `null`.	`yii\db\Schema`
`$exceptionMap`	`array`	Map of DB errors and corresponding exceptions If left part is found in DB error message exception class from the right part is used. Default: `['SQLSTATE[23' => 'yii\db\IntegrityException']`.	`yii\db\Schema`
`$lastInsertID` read-only	`string`	The row ID of the last row inserted, or the last value retrieved from the sequence object.	`yii\db\Schema`
`$queryBuilder` read-only	`yii\db\TQueryBuilder`	The query builder for this connection.	`yii\db\Schema`
`$schemaChecks` read-only	`yii\db\CheckConstraint[][]`	Check constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$schemaDefaultValues` read-only	`yii\db\DefaultValueConstraint[]`	Default value constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$schemaForeignKeys` read-only	`yii\db\ForeignKeyConstraint[][]`	Foreign keys for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$schemaIndexes` read-only	`yii\db\IndexConstraint[][]`	Indexes for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$schemaNames` read-only	`string[]`	All schema names in the database, except system schemas.	`yii\db\Schema`
`$schemaPrimaryKeys` read-only	`yii\db\Constraint[]`	Primary keys for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$schemaUniques` read-only	`yii\db\IndexConstraint[][]`	Unique constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`$serverVersion` read-only	`string`	Server version as a string.	`yii\db\Schema`
`$systemSchemaNames`	`list<string>`	List of schema names that should be excluded from `getSchemaNames()`. Default: `[]`.	`yii\db\Schema`
`$tableNames` read-only	`string[]`	All table names in the database.	`yii\db\Schema`
`$tableSchemas` read-only	`yii\db\TableSchema[]`	The metadata for all tables in the database.	`yii\db\Schema`
`$transactionIsolationLevel` write-only	`string`	The transaction isolation level to use for this transaction.	`yii\db\Schema`
`$typeMap`	`array`	Mapping from physical column types (keys) to abstract column types (values) Default: ['tinyint' => self::TYPE_TINYINT, 'bool' => self::TYPE_TINYINT, 'boolean' => self::TYPE_TINYINT, 'bit' => self::TYPE_INTEGER, 'smallint' => self::TYPE_SMALLINT, 'mediumint' => self::TYPE_INTEGER, 'int' => self::TYPE_INTEGER, 'integer' => self::TYPE_INTEGER, 'bigint' => self::TYPE_BIGINT, 'float' => self::TYPE_FLOAT, 'double' => self::TYPE_DOUBLE, 'double precision' => self::TYPE_DOUBLE, 'real' => self::TYPE_FLOAT, 'decimal' => self::TYPE_DECIMAL, 'numeric' => self::TYPE_DECIMAL, 'dec' => self::TYPE_DECIMAL, 'fixed' => self::TYPE_DECIMAL, 'tinytext' => self::TYPE_TEXT, 'mediumtext' => self::TYPE_TEXT, 'longtext' => self::TYPE_TEXT, 'longblob' => self::TYPE_BINARY, 'blob' => self::TYPE_BINARY, 'text' => self::TYPE_TEXT, 'varchar' => self::TYPE_STRING, 'string' => self::TYPE_STRING, 'char' => self::TYPE_CHAR, 'datetime' => self::TYPE_DATETIME, 'year' => self::TYPE_DATE, 'date' => self::TYPE_DATE, 'time' => self::TYPE_TIME, 'timestamp' => self::TYPE_TIMESTAMP, 'enum' => self::TYPE_STRING, 'set' => self::TYPE_STRING, 'binary' => self::TYPE_BINARY, 'varbinary' => self::TYPE_BINARY, 'json' => self::TYPE_JSON].	`Schema`
`$columnQuoteCharacter` protected	`string\|string[]`	Default: '`'. Available since 2.0.14.	`Schema`
`$tableQuoteCharacter` protected	`string\|string[]`	Default: '`'. Available since 2.0.14.	`Schema`

Methods

Method	Description	Defined by
`__construct()`	Constructor.	`yii\base\BaseObject`
`__call()`	Calls the named method which is not a class method.	`yii\base\BaseObject`
`__get()`	Returns the value of an object property.	`yii\base\BaseObject`
`__isset()`	Checks if a property is set, i.e. defined and not null.	`yii\base\BaseObject`
`__set()`	Sets value of an object property.	`yii\base\BaseObject`
`__unset()`	Sets an object property to null.	`yii\base\BaseObject`
`canGetProperty()`	Returns a value indicating whether a property can be read.	`yii\base\BaseObject`
`canSetProperty()`	Returns a value indicating whether a property can be set.	`yii\base\BaseObject`
`className()` static	Returns the fully qualified name of this class.	`yii\base\BaseObject`
`convertException()`	Converts a DB exception to a more concrete one if possible.	`yii\db\Schema`
`createColumnSchemaBuilder()`	Create a column schema builder instance giving the type and value precision.	`Schema`
`createQueryBuilder()`	Creates a query builder for the MySQL database.	`Schema`
`createSavepoint()`	Creates a new savepoint.	`yii\db\Schema`
`findUniqueIndexes()`	Returns all unique indexes for the given table.	`Schema`
`getLastInsertID()`	Returns the ID of the last inserted row or sequence value.	`yii\db\Schema`
`getPdoType()`	Determines the PDO type for the given PHP data value.	`yii\db\Schema`
`getQueryBuilder()`		`yii\db\Schema`
`getRawTableName()`	Returns the actual name of a given table name.	`yii\db\Schema`
`getSchemaChecks()`	Returns check constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getSchemaDefaultValues()`	Returns default value constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getSchemaForeignKeys()`	Returns foreign keys for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getSchemaIndexes()`	Returns indexes for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getSchemaNames()`	Returns all schema names in the database, except system schemas.	`yii\db\Schema`
`getSchemaPrimaryKeys()`	Returns primary keys for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getSchemaUniques()`	Returns unique constraints for all tables in the database.	`yii\db\ConstraintFinderTrait`
`getServerVersion()`	Returns a server version as a string comparable by `version_compare()`.	`yii\db\Schema`
`getTableChecks()`	Obtains the check constraints information for the named table.	`yii\db\ConstraintFinderTrait`
`getTableDefaultValues()`	Obtains the default value constraints information for the named table.	`yii\db\ConstraintFinderTrait`
`getTableForeignKeys()`	Obtains the foreign keys information for the named table.	`yii\db\ConstraintFinderTrait`
`getTableIndexes()`	Obtains the indexes information for the named table.	`yii\db\ConstraintFinderTrait`
`getTableNames()`	Returns all table names in the database.	`yii\db\Schema`
`getTablePrimaryKey()`	Obtains the primary key for the named table.	`yii\db\ConstraintFinderTrait`
`getTableSchema()`	Obtains the metadata for the named table.	`yii\db\Schema`
`getTableSchemas()`	Returns the metadata for all tables in the database.	`yii\db\Schema`
`getTableUniques()`	Obtains the unique constraints information for the named table.	`yii\db\ConstraintFinderTrait`
`hasMethod()`	Returns a value indicating whether a method is defined.	`yii\base\BaseObject`
`hasProperty()`	Returns a value indicating whether a property is defined.	`yii\base\BaseObject`
`init()`	Initializes the object.	`yii\base\BaseObject`
`insert()`	Executes the INSERT command, returning primary key values.	`yii\db\Schema`
`isReadQuery()`	Returns a value indicating whether a SQL statement is for read purpose.	`yii\db\Schema`
`quoteColumnName()`	Quotes a column name for use in a query.	`yii\db\Schema`
`quoteSimpleColumnName()`	Quotes a simple column name for use in a query.	`yii\db\Schema`
`quoteSimpleTableName()`	Quotes a simple table name for use in a query.	`yii\db\Schema`
`quoteTableName()`	Quotes a table name for use in a query.	`yii\db\Schema`
`quoteValue()`	Quotes a string value for use in a query.	`yii\db\Schema`
`refresh()`	Refreshes the schema.	`yii\db\Schema`
`refreshTableSchema()`	Refreshes the particular table schema.	`yii\db\Schema`
`releaseSavepoint()`	Releases an existing savepoint.	`yii\db\Schema`
`resolveRawTableName()`	Resolves the table name and schema name (if any) without loading database metadata.	`yii\db\Schema`
`rollBackSavepoint()`	Rolls back to a previously created savepoint.	`yii\db\Schema`
`setTransactionIsolationLevel()`	Sets the isolation level of the current transaction.	`yii\db\Schema`
`supportsSavepoint()`		`yii\db\Schema`
`unquoteSimpleColumnName()`	Unquotes a simple column name.	`yii\db\Schema`
`unquoteSimpleTableName()`	Unquotes a simple table name.	`yii\db\Schema`
`createColumnSchema()` protected	Creates a column schema for the database.	`yii\db\Schema`
`findColumns()` protected	Collects the metadata of table columns.	`Schema`
`findConstraints()` protected	Collects the foreign key column details for the given table.	`Schema`
`findSchemaNames()` protected	Returns all schema names in the database, including the default one but not system schemas.	`yii\db\Schema`
`findTableNames()` protected	Returns all table names in the database.	`Schema`
`getCacheKey()` protected	Returns the cache key for the specified table name.	`yii\db\Schema`
`getCacheTag()` protected	Returns the cache tag name.	`yii\db\Schema`
`getColumnPhpType()` protected	Extracts the PHP type from abstract DB type.	`yii\db\Schema`
`getCreateTableSql()` protected	Gets the CREATE TABLE sql string.	`Schema`
`getSchemaMetadata()` protected	Returns the metadata of the given type for all tables in the given schema.	`yii\db\Schema`
`getTableMetadata()` protected	Returns the metadata of the given type for the given table.	`yii\db\Schema`
`getTableNameParts()` protected	Splits full table name into parts.	`yii\db\Schema`
`loadColumnSchema()` protected	Loads the column information into a `ColumnSchema` object.	`Schema`
`loadTableChecks()` protected		`Schema`
`loadTableDefaultValues()` protected		`Schema`
`loadTableForeignKeys()` protected		`Schema`
`loadTableIndexes()` protected		`Schema`
`loadTablePrimaryKey()` protected		`Schema`
`loadTableSchema()` protected	Loads the metadata for the specified table.	`Schema`
`loadTableUniques()` protected		`Schema`
`normalizePdoRowKeyCase()` protected	Changes row’s array key case to lower if PDO’s one is set to uppercase.	`yii\db\Schema`
`resolveTableName()` protected	Resolves the table name and schema name (if any).	`Schema`
`setTableMetadata()` protected	Sets the metadata of the given type for the given table.	`yii\db\Schema`

Constants

Constant	Value	Description	Defined by
`TYPE_PK`	`'pk'`		`yii\db\Schema`
`TYPE_UPK`	`'upk'`		`yii\db\Schema`
`TYPE_BIGPK`	`'bigpk'`		`yii\db\Schema`
`TYPE_UBIGPK`	`'ubigpk'`		`yii\db\Schema`
`TYPE_CHAR`	`'char'`		`yii\db\Schema`
`TYPE_STRING`	`'string'`		`yii\db\Schema`
`TYPE_TEXT`	`'text'`		`yii\db\Schema`
`TYPE_TINYINT`	`'tinyint'`		`yii\db\Schema`
`TYPE_SMALLINT`	`'smallint'`		`yii\db\Schema`
`TYPE_INTEGER`	`'integer'`		`yii\db\Schema`
`TYPE_BIGINT`	`'bigint'`		`yii\db\Schema`
`TYPE_FLOAT`	`'float'`		`yii\db\Schema`
`TYPE_DOUBLE`	`'double'`		`yii\db\Schema`
`TYPE_DECIMAL`	`'decimal'`		`yii\db\Schema`
`TYPE_DATETIME`	`'datetime'`		`yii\db\Schema`
`TYPE_TIMESTAMP`	`'timestamp'`		`yii\db\Schema`
`TYPE_TIME`	`'time'`		`yii\db\Schema`
`TYPE_DATE`	`'date'`		`yii\db\Schema`
`TYPE_BINARY`	`'binary'`		`yii\db\Schema`
`TYPE_BOOLEAN`	`'boolean'`		`yii\db\Schema`
`TYPE_MONEY`	`'money'`		`yii\db\Schema`
`TYPE_JSON`	`'json'`		`yii\db\Schema`
`SCHEMA_CACHE_VERSION`	`1`	Schema cache version, to detect incompatibilities in cached values when the data format of the cache changes.	`yii\db\Schema`

Property details

$columnQuoteCharacter

protected string|string[] $columnQuoteCharacter = '`'

An array of 2 characters can be used in case starting and ending characters are different.

Since

2.0.14

$tableQuoteCharacter

protected string|string[] $tableQuoteCharacter = '`'

An array of 2 characters can be used in case starting and ending characters are different.

Since

2.0.14

Method details

createColumnSchemaBuilder()

public function createColumnSchemaBuilder(mixed $type, mixed $length = null): yii\db\ColumnSchemaBuilder

Create a column schema builder instance giving the type and value precision.

This method may be overridden by child classes to create a DBMS-specific column schema builder.

Parameters

Parameter	Type	Description
`$type`	`mixed`	Type of the column. See `ColumnSchemaBuilder::$type`.
`$length`	`mixed`	Length or precision of the column. See `ColumnSchemaBuilder::$length`.

Returns

yii\db\ColumnSchemaBuilder: Column schema builder instance

Since

2.0.6

createQueryBuilder()

public function createQueryBuilder(): yii\db\mysql\QueryBuilder

Creates a query builder for the MySQL database.

Returns

QueryBuilder: Query builder instance

findUniqueIndexes()

public function findUniqueIndexes(yii\db\TableSchema $table): array

Returns all unique indexes for the given table.

Each array element is of the following structure:

[
    'IndexName1' => ['col1' [, ...]],
    'IndexName2' => ['col2' [, ...]],
]

Parameters

Parameter	Type	Description
`$table`	`yii\db\TableSchema`	The table metadata

Returns

array: All unique indexes for the given table.

findColumns()

protected function findColumns(yii\db\TableSchema $table): bool

Collects the metadata of table columns.

Parameters

Parameter	Type	Description
`$table`	`yii\db\TableSchema`	The table metadata

Returns

bool: Whether the table exists in the database

Throws

Exception: if DB query fails

findConstraints()

protected function findConstraints(yii\db\TableSchema $table): mixed

Collects the foreign key column details for the given table.

Parameters

Parameter	Type	Description
`$table`	`yii\db\TableSchema`	The table metadata

Returns

mixed

Throws

Exception

findTableNames()

protected function findTableNames(mixed $schema = ''): array

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.

Parameters

Parameter	Type	Description
`$schema`	`mixed`	The schema of the tables. Defaults to empty string, meaning the current or default schema.

Returns

array: All table names in the database. The names have NO schema name prefix.

Throws

yii\base\NotSupportedException: if this method is not supported by the DBMS.

getCreateTableSql()

protected function getCreateTableSql(yii\db\TableSchema $table): string

Gets the CREATE TABLE sql string.

Parameters

Parameter	Type	Description
`$table`	`yii\db\TableSchema`	The table metadata

Returns

string: $sql the result of ‘SHOW CREATE TABLE’

loadColumnSchema()

protected function loadColumnSchema(array $info): yii\db\mysql\T

Loads the column information into a ColumnSchema object.

Parameters

Parameter	Type	Description
`$info`	`array`	Column information

Returns

yii\db\mysql\T: The column schema object

loadTableChecks()

protected function loadTableChecks(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

loadTableDefaultValues()

protected function loadTableDefaultValues(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

Throws

yii\base\NotSupportedException: if this method is called.

loadTableForeignKeys()

protected function loadTableForeignKeys(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

loadTableIndexes()

protected function loadTableIndexes(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

loadTablePrimaryKey()

protected function loadTablePrimaryKey(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

loadTableSchema()

protected function loadTableSchema(mixed $name): yii\db\TableSchema|null

Loads the metadata for the specified table.

Parameters

Parameter	Type	Description
`$name`	`mixed`	Table name

Returns

yii\db\TableSchema|null: DBMS-dependent table metadata, null if the table does not exist.

loadTableUniques()

protected function loadTableUniques(mixed $tableName)

Parameters

Parameter	Type	Description
`$tableName`	`mixed`

resolveTableName()

protected function resolveTableName(mixed $name): yii\db\TableSchema

Resolves the table name and schema name (if any).

Parameters

Parameter	Type	Description
`$name`	`mixed`	The table name

Returns

yii\db\TableSchema: TableSchema with resolved table, schema, etc. names.

Throws

yii\base\NotSupportedException: if this method is not supported by the DBMS.

Since

2.0.13