public Class CUBRIDDialect

Overrides org.hibernate.dialect.Dialect.bindLimitParametersInReverseOrder.

Doc from org.hibernate.dialect.Dialect.bindLimitParametersInReverseOrder.

ANSI SQL defines the LIMIT clause to be in the form LIMIT offset, limit. Does this dialect require us to bind the parameters in reverse order?

Returns:boolean

true if the correct order is limit, offset

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.dropConstraints.

Doc from org.hibernate.dialect.Dialect.dropConstraints.

Do we need to drop constraints before dropping tables in this dialect?

Returns:boolean

True if constraints must be dropped prior to dropping the table; false otherwise.

Overrides org.hibernate.dialect.Dialect.forUpdateOfColumns.

Doc from org.hibernate.dialect.Dialect.forUpdateOfColumns.

Is FOR UPDATE OF syntax supported?

Returns:boolean

True if the database supports FOR UPDATE OF syntax; false otherwise.

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.getCreateSequenceString.

Doc from org.hibernate.dialect.Dialect.getCreateSequenceString.

Typically dialects which support sequences can create a sequence with a single command. This is convenience form of getCreateSequenceStrings to help facilitate that.

Dialects which support sequences and can create a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to create a sequence should instead override getCreateSequenceStrings.

Parameters

sequenceName:String

The name of the sequence

Returns:String

The sequence creation command

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.getDropSequenceString.

Doc from org.hibernate.dialect.Dialect.getDropSequenceString.

Typically dialects which support sequences can drop a sequence with a single command. This is convenience form of getDropSequenceStrings to help facilitate that.

Dialects which support sequences and can drop a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to drop a sequence should instead override getDropSequenceStrings.

Parameters

sequenceName:String

The name of the sequence

Returns:String

The sequence drop commands

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.getIdentitySelectString.

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

Get the select command to use to retrieve the last generated IDENTITY value for a particular table

Parameters

table:String

The table into which the insert was done

column:String

The PK column.

type:int

The java.sql.Types type code.

Returns:String

The appropriate select command

Annotations

@Override

Exceptions

MappingException:

If IDENTITY generation is not supported.

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.getQuerySequencesString.

Doc from org.hibernate.dialect.Dialect.getQuerySequencesString.

Get the select command used retrieve the names of all sequences.

Returns:String

The select command; or null if sequences are not supported.

Overrides org.hibernate.dialect.Dialect.getSequenceNextValString.

Doc from org.hibernate.dialect.Dialect.getSequenceNextValString.

Generate the appropriate select statement to to retrieve the next value of a sequence.

This should be a "stand alone" select statement.

Parameters

sequenceName:String

the name of the sequence

Returns:String

String The "nextval" select string.

Overrides org.hibernate.dialect.Dialect.hasAlterTable.

Doc from org.hibernate.dialect.Dialect.hasAlterTable.

Does this dialect support the ALTER TABLE syntax?

Returns:boolean

True if we support altering of tables; false otherwise.

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.supportsCommentOn.

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.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.supportsSequences.

Doc from org.hibernate.dialect.Dialect.supportsSequences.

Does this dialect support sequences?

Returns:boolean

True if sequences supported; false otherwise.

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.

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.

Overrides org.hibernate.dialect.Dialect.useMaxForLimit.

Doc from org.hibernate.dialect.Dialect.useMaxForLimit.

Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

This is easiest understood via an example. Consider you have a table with 20 rows, but you only want to retrieve rows number 11 through 20. Generally, a limit with offset would say that the offset = 11 and the limit = 10 (we only want 10 rows at a time); this is specifying the total number of returned rows. Some dialects require that we instead specify offset = 11 and limit = 20, where 20 is the "last" row we want relative to offset (i.e. total number of rows = 20 - 11 = 9)

So essentially, is limit relative from offset? Or is limit absolute?

Returns:boolean

True if limit is relative from offset; false otherwise.