pack-priv abstract Class AbstractTransactSQLDialect

Overrides org.hibernate.dialect.Dialect.appendLockHint.

Doc from org.hibernate.dialect.Dialect.appendLockHint.

Some dialects support an alternative means to SELECT FOR UPDATE, whereby a "lock hint" is appended to the table name in the from clause.

contributed by Helge Schulz

Parameters

lockOptions:LockOptions

The lock options to apply

tableName:String

The name of the table to which to apply the lock hint.

Returns:String

The table with any required lock hints.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.applyLocksToSql.

Doc from org.hibernate.dialect.Dialect.applyLocksToSql.

Modifies the given SQL by applying the appropriate updates for the specified lock modes and key columns.

The behavior here is that of an ANSI SQL SELECT FOR UPDATE. This method is really intended to allow dialects which do not support SELECT FOR UPDATE to achieve this in their own fashion.

Parameters

sql:String

the SQL string to modify

aliasedLockOptions:LockOptions

lock options indexed by aliased table names.

keyColumnNames:Map<String, String[]>

a map of key columns indexed by aliased table names.

Returns:String

the modified SQL string.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.doesReadCommittedCauseWritersToBlockReaders.

Doc from org.hibernate.dialect.Dialect.doesReadCommittedCauseWritersToBlockReaders.

For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?

Returns:boolean

True if writers block readers to achieve READ_COMMITTED; false otherwise.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.doesRepeatableReadCauseReadersToBlockWriters.

Doc from org.hibernate.dialect.Dialect.doesRepeatableReadCauseReadersToBlockWriters.

For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?

Returns:boolean

True if readers block writers to achieve REPEATABLE_READ; false otherwise.

Annotations

@Override

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.

Annotations

@Override

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.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.getDefaultMultiTableBulkIdStrategy.

Annotations

@Override

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.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.getIdentityColumnSupport.

Doc from org.hibernate.dialect.Dialect.getIdentityColumnSupport.

Get the appropriate IdentityColumnSupport

Returns:IdentityColumnSupport

the IdentityColumnSupport

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.getNullColumnString.

Doc from org.hibernate.dialect.Dialect.getNullColumnString.

The keyword used to specify a nullable column.

Returns:String

String

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.getResultSet.

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

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

Parameters

ps:CallableStatement

The callable statement.

Returns:ResultSet

The extracted result set.

Annotations

@Override

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.

Annotations

@Override

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.

Annotations

@Override

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

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.registerResultSetOutParameter.

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

Registers a parameter (either OUT, or the new REF_CURSOR param type available in Java 8) capable of returning ResultSet *by position*. Pre-Java 8, registering such ResultSet-returning parameters varied greatly across database and drivers; hence its inclusion as part of the Dialect contract.

Parameters

statement:CallableStatement

The callable statement.

col:int

The bind position at which to register the output param.

Returns:int

The number of (contiguous) bind positions used.

Annotations

@Override

Exceptions

SQLException:

Indicates problems registering the param.

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.

Annotations

@Override

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.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.supportsExistsInSelect.

Doc from org.hibernate.dialect.Dialect.supportsExistsInSelect.

Does the dialect support an exists statement in the select clause?

Returns:boolean

True if exists checks are allowed in the select clause; false otherwise.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.supportsPartitionBy.

Doc from org.hibernate.dialect.Dialect.supportsPartitionBy.

Does the underlying database support partition by

Returns:boolean

boolean

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.supportsTupleDistinctCounts.

Doc from org.hibernate.dialect.Dialect.supportsTupleDistinctCounts.

Does this dialect support `count(distinct a,b)`?

Returns:boolean

True if the database supports counting distinct tuples; false otherwise.

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.supportsTuplesInSubqueries.

Doc from org.hibernate.dialect.Dialect.supportsTuplesInSubqueries.

Does this dialect support tuples in subqueries? Ex: delete from Table1 where (col1, col2) in (select col1, col2 from Table2)

Returns:boolean

boolean

Annotations

@Override

Overrides org.hibernate.dialect.Dialect.supportsUnionAll.

Doc from org.hibernate.dialect.Dialect.supportsUnionAll.

Does this dialect support UNION ALL, which is generally a faster variant of UNION?

Returns:boolean

True if UNION ALL is supported; false otherwise.

Annotations

@Override