public Class MySQLDialect

Overrides org.hibernate.dialect.Dialect.areStringComparisonsCaseInsensitive.

Doc from org.hibernate.dialect.Dialect.areStringComparisonsCaseInsensitive.

Are string comparisons implicitly case insensitive.

In other words, does [where 'XYZ' = 'xyz'] resolve to true?

Returns:boolean

True if comparisons are case insensitive.

Overrides org.hibernate.dialect.Dialect.closeQuote.

Doc from org.hibernate.dialect.Dialect.closeQuote.

The character specific to this dialect used to close a quoted identifier.

Returns:char

The dialect's specific close quote character.

Overrides org.hibernate.dialect.Dialect.getAddColumnString.

Doc from org.hibernate.dialect.Dialect.getAddColumnString.

The syntax used to add a column to a table (optional).

Returns:String

The "add column" fragment.

Overrides org.hibernate.dialect.Dialect.getAddForeignKeyConstraintString.

Doc from org.hibernate.dialect.Dialect.getAddForeignKeyConstraintString.

The syntax used to add a foreign key constraint to a table.

Parameters

constraintName:String

The FK constraint name.

foreignKey:String[]

The names of the columns comprising the FK

referencedTable:String

The table referenced by the FK

primaryKey:String[]

The explicit columns in the referencedTable referenced by this FK.

referencesPrimaryKey:boolean

if false, constraint should be explicit about which column names the constraint refers to

Returns:String

the "add FK" fragment

Overrides org.hibernate.dialect.Dialect.getCastTypeName.

Doc from org.hibernate.dialect.Dialect.getCastTypeName.

Get the name of the database type appropriate for casting operations (via the CAST() SQL function) for the given java.sql.Types typecode.

Parameters

code:int

The java.sql.Types typecode

Returns:String

The database type name

Overrides org.hibernate.dialect.Dialect.getColumnComment.

Overrides org.hibernate.dialect.Dialect.getCreateTemporaryTableString.

Doc from org.hibernate.dialect.Dialect.getCreateTemporaryTableString.

Command used to create a temporary table.

Returns:String

The command used to create a temporary table.

Overrides org.hibernate.dialect.Dialect.getCurrentTimestampSelectString.

Doc from org.hibernate.dialect.Dialect.getCurrentTimestampSelectString.

Retrieve the command used to retrieve the current timestamp from the database.

Returns:String

The command.

Overrides org.hibernate.dialect.Dialect.getDropForeignKeyString.

Overrides org.hibernate.dialect.Dialect.getDropTemporaryTableString.

Doc from org.hibernate.dialect.Dialect.getDropTemporaryTableString.

Command used to drop a temporary table.

Returns:String

The command used to drop a temporary table.

Overrides org.hibernate.dialect.Dialect.getForUpdateString.

Doc from org.hibernate.dialect.Dialect.getForUpdateString.

Get the string to append to SELECT statements to acquire locks for this dialect.

Returns:String

The appropriate FOR UPDATE clause string.

Overrides org.hibernate.dialect.Dialect.getIdentityColumnString.

Doc from org.hibernate.dialect.Dialect.getIdentityColumnString.

The syntax used during DDL to define a column as being an IDENTITY.

Returns:String

The appropriate DDL fragment.

Overrides org.hibernate.dialect.Dialect.getIdentitySelectString.

Doc from org.hibernate.dialect.Dialect.getIdentitySelectString.

Get the select command to use to retrieve the last generated IDENTITY value.

Returns:String

The appropriate select command

Overrides org.hibernate.dialect.Dialect.getLimitString.

Doc from org.hibernate.dialect.Dialect.getLimitString.

Apply s limit clause to the query.

Typically dialects utilize variable limit clauses when they support limits. Thus, when building the select command we do not actually need to know the limit or the offest since we will just be using placeholders.

Here we do still pass along whether or not an offset was specified so that dialects not supporting offsets can generate proper exceptions. In general, dialects will override one or the other of this method and getLimitString(String, int, int).

Parameters

sql:String

The query to which to apply the limit.

hasOffset:boolean

Is the query requesting an offset?

Returns:String

the modified SQL

Overrides org.hibernate.dialect.Dialect.getReadLockString.

Doc from org.hibernate.dialect.Dialect.getReadLockString.

Get the string to append to SELECT statements to acquire WRITE locks for this dialect. Location of the of the returned string is treated the same as getForUpdateString.

Parameters

timeout:int

in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:String

The appropriate LOCK clause string.

Overrides org.hibernate.dialect.Dialect.getResultSet.

Doc from org.hibernate.dialect.Dialect.getResultSet.

Given a callable statement previously processed by registerResultSetOutParameter, extract the java.sql.ResultSet from the OUT parameter.

Parameters

ps:CallableStatement

The callable statement.

Returns:ResultSet

The extracted result set.

Exceptions

SQLException:

Indicates problems extracting the result set.

Overrides org.hibernate.dialect.Dialect.getSelectGUIDString.

Doc from org.hibernate.dialect.Dialect.getSelectGUIDString.

Get the command used to select a GUID from the underlying database.

Optional operation.

Returns:String

The appropriate command.

Overrides org.hibernate.dialect.Dialect.getTableComment.

Overrides org.hibernate.dialect.Dialect.getWriteLockString.

Doc from org.hibernate.dialect.Dialect.getWriteLockString.

Get the string to append to SELECT statements to acquire WRITE locks for this dialect. Location of the of the returned string is treated the same as getForUpdateString.

Parameters

timeout:int

in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:String

The appropriate LOCK clause string.

Overrides org.hibernate.dialect.Dialect.isCurrentTimestampSelectStringCallable.

Doc from org.hibernate.dialect.Dialect.isCurrentTimestampSelectStringCallable.

Should the value returned by getCurrentTimestampSelectString be treated as callable. Typically this indicates that JDBC escape syntax is being used...

Returns:boolean

True if the getCurrentTimestampSelectString return is callable; false otherwise.

Overrides org.hibernate.dialect.Dialect.openQuote.

Doc from org.hibernate.dialect.Dialect.openQuote.

The character specific to this dialect used to begin a quoted identifier.

Returns:char

The dialect's specific open quote character.

Overrides org.hibernate.dialect.Dialect.performTemporaryTableDDLInIsolation.

Doc from org.hibernate.dialect.Dialect.performTemporaryTableDDLInIsolation.

Does the dialect require that temporary table DDL statements occur in isolation from other statements? This would be the case if the creation would cause any current transaction to get committed implicitly.

JDBC defines a standard way to query for this information via the java.sql.DatabaseMetaData#dataDefinitionCausesTransactionCommit() method. However, that does not distinguish between temporary table DDL and other forms of DDL; MySQL, for example, reports DDL causing a transaction commit via its driver, even though that is not the case for temporary table DDL.

Possible return values and their meanings:

• Boolean#TRUE - Unequivocally, perform the temporary table DDL in isolation.
• Boolean#FALSE - Unequivocally, do not perform the temporary table DDL in isolation.
• null - defer to the JDBC driver response in regards to java.sql.DatabaseMetaData#dataDefinitionCausesTransactionCommit()

Returns:Boolean

see the result matrix above.

Overrides org.hibernate.dialect.Dialect.qualifyIndexName.

Doc from org.hibernate.dialect.Dialect.qualifyIndexName.

Do we need to qualify index names with the schema name?

Returns:boolean

boolean

Overrides org.hibernate.dialect.Dialect.registerResultSetOutParameter.

Doc from org.hibernate.dialect.Dialect.registerResultSetOutParameter.

Registers an OUT parameter which will be returning a java.sql.ResultSet. How this is accomplished varies greatly from DB to DB, hence its inclusion (along with getResultSet) here.

Parameters

statement:CallableStatement

The callable statement.

col:int

The bind position at which to register the OUT param.

Returns:int

The number of (contiguous) bind positions used.

Exceptions

SQLException:

Indicates problems registering the OUT param.

Overrides org.hibernate.dialect.Dialect.supportsCascadeDelete.

Overrides org.hibernate.dialect.Dialect.supportsCurrentTimestampSelection.

Doc from org.hibernate.dialect.Dialect.supportsCurrentTimestampSelection.

Does this dialect support a way to retrieve the database's current timestamp value?

Returns:boolean

True if the current timestamp can be retrieved; false otherwise.

Overrides org.hibernate.dialect.Dialect.supportsEmptyInList.

Doc from org.hibernate.dialect.Dialect.supportsEmptyInList.

Does this dialect support empty IN lists?

For example, is [where XYZ in ()] a supported construct?

Returns:boolean

True if empty in lists are supported; false otherwise.

Overrides org.hibernate.dialect.Dialect.supportsIdentityColumns.

Doc from org.hibernate.dialect.Dialect.supportsIdentityColumns.

Does this dialect support identity column key generation?

Returns:boolean

True if IDENTITY columns are supported; false otherwise.

Overrides org.hibernate.dialect.Dialect.supportsIfExistsBeforeTableName.

Overrides org.hibernate.dialect.Dialect.supportsLimit.

Doc from org.hibernate.dialect.Dialect.supportsLimit.

Does this dialect support some form of limiting query results via a SQL clause?

Returns:boolean

True if this dialect supports some form of LIMIT.

Overrides org.hibernate.dialect.Dialect.supportsLobValueChangePropogation.

Doc from org.hibernate.dialect.Dialect.supportsLobValueChangePropogation.

Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...

For BLOBs, the internal value might be changed by: java.sql.Blob#setBinaryStream, java.sql.Blob#setBytes(long, byte[]), java.sql.Blob#setBytes(long, byte[], int, int), or java.sql.Blob#truncate(long).

For CLOBs, the internal value might be changed by: java.sql.Clob#setAsciiStream(long), java.sql.Clob#setCharacterStream(long), java.sql.Clob#setString(long, String), java.sql.Clob#setString(long, String, int, int), or java.sql.Clob#truncate(long).

NOTE : I do not know the correct answer currently for databases which (1) are not part of the cruise control process or (2) do not supportsExpectedLobUsagePattern.

Returns:boolean

True if the changes are propagated back to the database; false otherwise.

Overrides org.hibernate.dialect.Dialect.supportsRowValueConstructorSyntax.

Doc from org.hibernate.dialect.Dialect.supportsRowValueConstructorSyntax.

Is this dialect known to support what ANSI-SQL terms "row value constructor" syntax; sometimes called tuple syntax.

Basically, does it support syntax like "... where (FIRST_NAME, LAST_NAME) = ('Steve', 'Ebersole') ...".

Returns:boolean

True if this SQL dialect is known to support "row value constructor" syntax; false otherwise.

Overrides org.hibernate.dialect.Dialect.supportsSubqueryOnMutatingTable.

Doc from org.hibernate.dialect.Dialect.supportsSubqueryOnMutatingTable.

Does this dialect support referencing the table being mutated in a subquery. The "table being mutated" is the table referenced in an UPDATE or a DELETE query. And so can that table then be referenced in a subquery of said UPDATE/DELETE query.

For example, would the following two syntaxes be supported:

• delete from TABLE_A where ID not in ( select ID from TABLE_A )
• update TABLE_A set NON_ID = 'something' where ID in ( select ID from TABLE_A)

Returns:boolean

True if this dialect allows references the mutating table from a subquery.

Overrides org.hibernate.dialect.Dialect.supportsTemporaryTables.

Doc from org.hibernate.dialect.Dialect.supportsTemporaryTables.

Does this dialect support temporary tables?

Returns:boolean

True if temp tables are supported; false otherwise.