org.springframework.data.relational.core.dialect

Interface OrderByNullPrecedence

All Known Implementing Classes:

OrderByNullPrecedence.SqlStandardOrderByNullPrecedence

public interface OrderByNullPrecedence

Represents how the Sort.NullHandling option of an ORDER BY sort expression is to be evaluated.

Since:

2.4

Author:

Chirag Tailor

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	OrderByNullPrecedence.SqlStandardOrderByNullPrecedence An OrderByNullPrecedence implementation for databases conforming to the SQL standard which uses NULLS FIRST and NULLS LAST in ORDER BY sort expressions to make null values appear before or after non-null values in the result set.

Field Summary

Fields

Modifier and Type	Field and Description
static OrderByNullPrecedence	NONE An OrderByNullPrecedence that can be used for databases that do not support the SQL standard usage of NULLS FIRST and NULLS LAST in ORDER BY sort expressions to control where null values appear respective to non-null values in the result set.
static OrderByNullPrecedence	SQL_STANDARD An OrderByNullPrecedence that can be used for databases conforming to the SQL standard which uses NULLS FIRST and NULLS LAST in ORDER BY sort expressions to make null values appear before or after non-null values in the result set.

Method Summary

Modifier and Type	Method and Description
String	evaluate(org.springframework.data.domain.Sort.NullHandling nullHandling) Converts a Sort.NullHandling option to the appropriate SQL text to be included an ORDER BY sort expression.

Field Detail

SQL_STANDARD

static final OrderByNullPrecedence SQL_STANDARD

An OrderByNullPrecedence that can be used for databases conforming to the SQL standard which uses NULLS FIRST and NULLS LAST in ORDER BY sort expressions to make null values appear before or after non-null values in the result set.

NONE

static final OrderByNullPrecedence NONE

An OrderByNullPrecedence that can be used for databases that do not support the SQL standard usage of NULLS FIRST and NULLS LAST in ORDER BY sort expressions to control where null values appear respective to non-null values in the result set.

Method Detail

evaluate

String evaluate(org.springframework.data.domain.Sort.NullHandling nullHandling)

Converts a Sort.NullHandling option to the appropriate SQL text to be included an ORDER BY sort expression.