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java.lang.Objectorg.apache.cayenne.dba.JdbcAdapter
org.apache.cayenne.dba.mysql.MySQLAdapter
public class MySQLAdapter
DbAdapter implementation for MySQL RDBMS.
Foreign key constraints are supported by InnoDB engine and NOT supported by MyISAM
engine. This adapter by default assumes MyISAM, so
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.
Field Summary |
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Fields inherited from class org.apache.cayenne.dba.JdbcAdapter |
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ejbqlTranslatorFactory, extendedTypes, pkGenerator, supportsBatchUpdates, supportsFkConstraints, supportsGeneratedKeys, supportsUniqueConstraints, typesHandler |
Constructor Summary | |
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MySQLAdapter()
|
Method Summary | |
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DbAttribute |
buildAttribute(String name,
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. |
String |
createTable(DbEntity entity)
Overrides super implementation to explicitly set table engine to InnoDB if FK constraints are supported by this adapter. |
protected void |
createTableAppendColumn(StringBuffer sqlBuffer,
DbAttribute column)
Appends AUTO_INCREMENT clause to the column definition for generated columns. |
protected void |
createTableAppendPKClause(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. |
String |
dropTable(DbEntity table)
Deprecated. since 3.0 |
Collection<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. |
MergerFactory |
mergerFactory()
|
String |
tableTypeForView()
Returns null, since views are not yet supported in MySQL. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MySQLAdapter()
Method Detail |
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public SQLAction getAction(Query query, DataNode node)
getAction
in interface DbAdapter
getAction
in class JdbcAdapter
public String dropTable(DbEntity table)
JdbcAdapter
dropTable
in interface DbAdapter
dropTable
in class JdbcAdapter
public Collection<String> dropTableStatements(DbEntity table)
DbAdapter
dropTableStatements
in interface DbAdapter
dropTableStatements
in class JdbcAdapter
protected void configureExtendedTypes(ExtendedTypeMap map)
configureExtendedTypes
in class JdbcAdapter
public DbAttribute buildAttribute(String name, String typeName, int type, int size, int precision, boolean allowNulls)
DbAdapter
buildAttribute
in interface DbAdapter
buildAttribute
in class JdbcAdapter
name
- database column nametypeName
- database specific type name, may be used as a hint to determine the
right JDBC type.type
- JDBC column typesize
- 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 parameterpublic String tableTypeForView()
tableTypeForView
in interface DbAdapter
tableTypeForView
in class JdbcAdapter
protected PkGenerator createPkGenerator()
createPkGenerator
in class JdbcAdapter
protected EJBQLTranslatorFactory createEJBQLTranslatorFactory()
JdbcAdapter
EJBQLTranslatorFactory
used to generate visitors for
EJBQL to SQL translations. This method should be overriden by subclasses that need
to customize EJBQL generation.
createEJBQLTranslatorFactory
in class JdbcAdapter
public String createTable(DbEntity entity)
createTable
in interface DbAdapter
createTable
in class JdbcAdapter
protected void createTableAppendPKClause(StringBuffer sqlBuffer, DbEntity entity)
createTableAppendPKClause
in class JdbcAdapter
protected void createTableAppendColumn(StringBuffer sqlBuffer, DbAttribute column)
createTableAppendColumn
in class JdbcAdapter
public MergerFactory mergerFactory()
mergerFactory
in interface DbAdapter
mergerFactory
in class JdbcAdapter
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