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## org.apache.cayenne.dba.mysql
Class MySQLAdapter

    java.lang.Object
      org.apache.cayenne.dba.JdbcAdapter
          org.apache.cayenne.dba.mysql.MySQLAdapter

All Implemented Interfaces:
  DbAdapter

    public class MySQLAdapter

extends JdbcAdapter

DbAdapter implementation for MySQL RDBMS.

### Foreign Key Constraint Handling

Foreign key constraints are supported by InnoDB engine and NOT supported by MyISAM engine. This adapter by default assumes MyISAM, so `org.apache.cayenne.dba.JdbcAdapter#supportsFkConstraints()` will return false. Users can manually change this by calling setSupportsFkConstraints(true) or better by using an `AutoAdapter`, i.e. not entering the adapter name at all for the DataNode, letting Cayenne guess it in runtime. In the later case Cayenne will check the table_type MySQL variable to detect whether InnoDB is the default, and configure the adapter accordingly.

### Sample Connection Settings

- Adapter name: org.apache.cayenne.dba.mysql.MySQLAdapter
- DB URL: jdbc:mysql://serverhostname/dbname
- Driver Class: com.mysql.jdbc.Driver

Field Summary
`protected java.lang.String` | `storageEngine`
`protected boolean` | `supportsFkConstraints`

Fields inherited from class org.apache.cayenne.dba.JdbcAdapter
`batchQueryBuilderFactory, ejbqlTranslatorFactory, extendedTypes, identifiersEndQuote, identifiersStartQuote, logger, resourceLocator, supportsBatchUpdates, supportsGeneratedKeys, supportsUniqueConstraints, typesHandler`

Constructor Summary
`MySQLAdapter()`

Method Summary
`DbAttribute` | `buildAttribute(java.lang.String name, java.lang.String typeName, int type, int size, int precision, boolean allowNulls)` Creates and returns a DbAttribute based on supplied parameters (usually obtained from database meta data).
`protected void` | `configureExtendedTypes(ExtendedTypeMap map)` Installs appropriate ExtendedTypes used as converters for passing values between JDBC and Java layers.
`protected EJBQLTranslatorFactory` | `createEJBQLTranslatorFactory()` Creates and returns an `EJBQLTranslatorFactory` used to generate visitors for EJBQL to SQL translations.
`protected PkGenerator` | `createPkGenerator()` Creates and returns a primary key generator.
`java.lang.String` | `createTable(DbEntity entity)` Overrides super implementation to explicitly set table engine to InnoDB if FK constraints are supported by this adapter.
`void` | `createTableAppendColumn(java.lang.StringBuffer sqlBuffer, DbAttribute column)` Appends AUTO_INCREMENT clause to the column definition for generated columns.
`protected void` | `createTableAppendPKClause(java.lang.StringBuffer sqlBuffer, DbEntity entity)` Customizes PK clause semantics to ensure that generated columns are in the beginning of the PK definition, as this seems to be a requirement for InnoDB tables.
`java.util.Collection<java.lang.String>` | `dropTableStatements(DbEntity table)` Returns a collection of SQL statements needed to drop a database table.
`SQLAction` | `getAction(Query query, DataNode node)` Uses special action builder to create the right action.
`QualifierTranslator` | `getQualifierTranslator(QueryAssembler queryAssembler)` Creates and returns a default implementation of a qualifier translator.
`java.lang.String` | `getStorageEngine()`
`void` | `initIdentifiersQuotes()`
`MergerFactory` | `mergerFactory()`
`void` | `setStorageEngine(java.lang.String engine)`

Methods inherited from class org.apache.cayenne.dba.JdbcAdapter
`bindParameter, createFkConstraint, createUniqueConstraint, externalTypesForJdbcType, findResource, getBatchQueryBuilderFactory, getBatchTerminator, getEjbqlTranslatorFactory, getExtendedTypes, getIdentifiersEndQuote, getIdentifiersStartQuote, getJdbcEventLogger, getPkGenerator, getQuotingStrategy, setBatchQueryBuilderFactory, setEjbqlTranslatorFactory, setPkGenerator, setSupportsBatchUpdates, setSupportsGeneratedKeys, setSupportsUniqueConstraints, supportsBatchUpdates, supportsGeneratedKeys, supportsUniqueConstraints, tableTypeForTable, tableTypeForView`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### storageEngine

    protected java.lang.String storageEngine

### supportsFkConstraints

    protected boolean supportsFkConstraints

Constructor Detail

### MySQLAdapter

    public MySQLAdapter()

Method Detail

### initIdentifiersQuotes

    public void initIdentifiersQuotes()

  Overrides:
    `initIdentifiersQuotes` in class `JdbcAdapter`

### getQualifierTranslator

    public QualifierTranslator getQualifierTranslator(QueryAssembler queryAssembler)

  Description copied from class: `JdbcAdapter`
  Creates and returns a default implementation of a qualifier translator.

  Specified by:
    `getQualifierTranslator` in interface `DbAdapter`
  Overrides:
    `getQualifierTranslator` in class `JdbcAdapter`

### getAction

    public SQLAction getAction(Query query,
                               DataNode node)

  Uses special action builder to create the right action.

  Specified by:
    `getAction` in interface `DbAdapter`
  Overrides:
    `getAction` in class `JdbcAdapter`
  Since:
    1.2

### dropTableStatements

    public java.util.Collection<java.lang.String> dropTableStatements(DbEntity table)

  Description copied from interface: `DbAdapter`
  Returns a collection of SQL statements needed to drop a database table.

  Specified by:
    `dropTableStatements` in interface `DbAdapter`
  Overrides:
    `dropTableStatements` in class `JdbcAdapter`
  Since:
    3.0

### configureExtendedTypes

    protected void configureExtendedTypes(ExtendedTypeMap map)

  Installs appropriate ExtendedTypes used as converters for passing values between JDBC and Java layers.

  Overrides:
    `configureExtendedTypes` in class `JdbcAdapter`

### buildAttribute

    public DbAttribute buildAttribute(java.lang.String name,
                                      java.lang.String typeName,
                                      int type,
                                      int size,
                                      int precision,
                                      boolean allowNulls)

  Description copied from interface: `DbAdapter`
  Creates and returns a DbAttribute based on supplied parameters (usually obtained from database meta data).

  Specified by:
    `buildAttribute` in interface `DbAdapter`
  Overrides:
    `buildAttribute` in class `JdbcAdapter`
  Parameters:
    `name` - database column name
    `typeName` - database specific type name, may be used as a hint to determine the right JDBC type.
    `type` - JDBC column type
    `size` - database column size (ignored if less than zero)
    `precision` - database column scale, i.e. the number of decimal digits (ignored if less than zero)
    `allowNulls` - database column nullable parameter

### createPkGenerator

    protected PkGenerator createPkGenerator()

  Creates and returns a primary key generator. Overrides superclass implementation to return an instance of MySQLPkGenerator that does the correct table locking.

  Overrides:
    `createPkGenerator` in class `JdbcAdapter`

### createEJBQLTranslatorFactory

    protected EJBQLTranslatorFactory createEJBQLTranslatorFactory()

  Description copied from class: `JdbcAdapter`
  Creates and returns an `EJBQLTranslatorFactory` used to generate visitors for EJBQL to SQL translations. This method should be overriden by subclasses that need to customize EJBQL generation.

  Overrides:
    `createEJBQLTranslatorFactory` in class `JdbcAdapter`
  Since:
    3.0

### createTable

    public java.lang.String createTable(DbEntity entity)

  Overrides super implementation to explicitly set table engine to InnoDB if FK constraints are supported by this adapter.

  Specified by:
    `createTable` in interface `DbAdapter`
  Overrides:
    `createTable` in class `JdbcAdapter`

### createTableAppendPKClause

    protected void createTableAppendPKClause(java.lang.StringBuffer sqlBuffer,
                                             DbEntity entity)

  Customizes PK clause semantics to ensure that generated columns are in the beginning of the PK definition, as this seems to be a requirement for InnoDB tables.

  Overrides:
    `createTableAppendPKClause` in class `JdbcAdapter`
  Since:
    1.2

### createTableAppendColumn

    public void createTableAppendColumn(java.lang.StringBuffer sqlBuffer,
                                        DbAttribute column)

  Appends AUTO_INCREMENT clause to the column definition for generated columns.

  Specified by:
    `createTableAppendColumn` in interface `DbAdapter`
  Overrides:
    `createTableAppendColumn` in class `JdbcAdapter`
  Parameters:
    `sqlBuffer` - the `StringBuffer` to append the column type to
    `column` - the `DbAttribute` defining the column to append type for

### mergerFactory

    public MergerFactory mergerFactory()

  Specified by:
    `mergerFactory` in interface `DbAdapter`
  Overrides:
    `mergerFactory` in class `JdbcAdapter`

### getStorageEngine

    public java.lang.String getStorageEngine()

  Since:
    3.0

### setStorageEngine

    public void setStorageEngine(java.lang.String engine)

  Since:
    3.0

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