org.apache.openjpa.jdbc.sql

Interface SelectExecutor

All Known Subinterfaces:

Select, Union

All Known Implementing Classes:

LogicalUnion, LogicalUnion.UnionSelect, SelectImpl

public interface SelectExecutor

Interface for configuring and executing a SQL select.

Author:

Abe White

Method Summary

Modifier and Type	Method and Description
Result	execute(JDBCStore store, JDBCFetchConfiguration fetch) Execute this select in the context of the given store manager.
Result	execute(JDBCStore store, JDBCFetchConfiguration fetch, int lockLevel) Execute this select in the context of the given store manager.
boolean	getAutoDistinct() Whether to automatically make results distinct when relational joins would otherwise introduce duplicates.
JDBCConfiguration	getConfiguration() Return the select configuration.
int	getCount(JDBCStore store) Return the number of instances matching this select.
int	getExpectedResultCount() The expected result count for the query.
int	getJoinSyntax() The join syntax for this select, as one of the syntax constants from JoinSyntaxes.
SQLBuffer	getSQL() Get the buffer if it has been computed by a previous call to toSelect(boolean, JDBCFetchConfiguration), if any.
boolean	hasMultipleSelects() Affirm if this receiver requires more than one selects to fetch its data.
boolean	isDistinct() Whether this is a SELECT DISTINCT / UNION ALL.
boolean	isLRS() Whether the result of this select should be treated as a large result set.
void	setAutoDistinct(boolean distinct) Whether to automatically make results distinct when relational joins would otherwise introduce duplicates.
void	setDistinct(boolean distinct) Whether this is a SELECT DISTINCT / UNION ALL.
void	setExpectedResultCount(int expectedResultCount, boolean force) The expected result count for the query.
void	setJoinSyntax(int joinSyntax) The join syntax for this select, as one of the syntax constants from JoinSyntaxes.
void	setLRS(boolean lrs) Whether the result of this select should be treated as a large result set.
boolean	supportsLocking() Whether this select can be executed for update.
boolean	supportsRandomAccess(boolean forUpdate) Return whether this select can support a random access result set type.
SQLBuffer	toSelect(boolean forUpdate, JDBCFetchConfiguration fetch) Return this select as a SQL statement formatted for the current dictionary.
SQLBuffer	toSelectCount() Return this select as a COUNT SQL statement formatted for the current dictionary.

Method Detail

getConfiguration

JDBCConfiguration getConfiguration()

Return the select configuration.

toSelect

SQLBuffer toSelect(boolean forUpdate,
                   JDBCFetchConfiguration fetch)

Return this select as a SQL statement formatted for the current dictionary.

getSQL

SQLBuffer getSQL()

Get the buffer if it has been computed by a previous call to toSelect(boolean, JDBCFetchConfiguration), if any.

Since:

2.0.0

toSelectCount

SQLBuffer toSelectCount()

Return this select as a COUNT SQL statement formatted for the current dictionary.

getAutoDistinct

boolean getAutoDistinct()

Whether to automatically make results distinct when relational joins would otherwise introduce duplicates.

setAutoDistinct

void setAutoDistinct(boolean distinct)

Whether to automatically make results distinct when relational joins would otherwise introduce duplicates.

isDistinct

boolean isDistinct()

Whether this is a SELECT DISTINCT / UNION ALL.

setDistinct

void setDistinct(boolean distinct)

Whether this is a SELECT DISTINCT / UNION ALL.

isLRS

boolean isLRS()

Whether the result of this select should be treated as a large result set.

setLRS

void setLRS(boolean lrs)

Whether the result of this select should be treated as a large result set.

getExpectedResultCount

int getExpectedResultCount()

The expected result count for the query.

setExpectedResultCount

void setExpectedResultCount(int expectedResultCount,
                            boolean force)

The expected result count for the query.

Parameters:

force - if false, the count will be discarded if this select has any to-many eager joins that would throw off the result count

getJoinSyntax

int getJoinSyntax()

The join syntax for this select, as one of the syntax constants from JoinSyntaxes.

setJoinSyntax

void setJoinSyntax(int joinSyntax)

The join syntax for this select, as one of the syntax constants from JoinSyntaxes.

supportsRandomAccess

boolean supportsRandomAccess(boolean forUpdate)

Return whether this select can support a random access result set type.

supportsLocking

boolean supportsLocking()

Whether this select can be executed for update.

getCount

int getCount(JDBCStore store)
      throws SQLException

Return the number of instances matching this select.

Throws:

SQLException

execute

Result execute(JDBCStore store,
               JDBCFetchConfiguration fetch)
        throws SQLException

Execute this select in the context of the given store manager.

Throws:

SQLException

execute

Result execute(JDBCStore store,
               JDBCFetchConfiguration fetch,
               int lockLevel)
        throws SQLException

Execute this select in the context of the given store manager.

Throws:

SQLException

hasMultipleSelects

boolean hasMultipleSelects()

Affirm if this receiver requires more than one selects to fetch its data.

Since:

2.0.0