org.springframework.jdbc.object
Class SqlQuery

java.lang.Object
  org.springframework.jdbc.object.RdbmsOperation
      org.springframework.jdbc.object.SqlOperation
          org.springframework.jdbc.object.SqlQuery

All Implemented Interfaces:

InitializingBean

Direct Known Subclasses:

MappingSqlQueryWithParameters, UpdatableSqlQuery

public abstract class SqlQuery
extends SqlOperation

Reusable operation object representing a SQL query.

Subclasses must implement the newRowMapper(java.lang.Object[], java.util.Map) method to provide an object that can extract the results of iterating over the ResultSet created during the execution of the query.

This class provides a number of public execute methods that are analogous to the different convenient JDO query execute methods. Subclasses can either rely on one of these inherited methods, or can add their own custom execution methods, with meaningful names and typed parameters (definitely a best practice). Each custom query method will invoke one of this class's untyped query methods.

Like all RdbmsOperation classes that ship with the Spring Framework, SqlQuery instances are thread-safe after their initialization is complete. That is, after they are constructed and configured via their setter methods, they can be used safely from multiple threads.

Author:

Rod Johnson, Juergen Hoeller, Thomas Risberg

See Also:

SqlUpdate

Field Summary

Fields inherited from class org.springframework.jdbc.object.RdbmsOperation

logger

Constructor Summary

SqlQuery()
Constructor to allow use as a JavaBean.

SqlQuery(DataSource ds, String sql)
Convenient constructor with a DataSource and SQL string.

Method Summary

List	execute() Convenient method to execute without parameters nor context.
List	execute(int p1) Convenient method to execute with a single int parameter.
List	execute(int p1, int p2) Convenient method to execute with two int parameters.
List	execute(int p1, int p2, Map context) Convenient method to execute with two int parameters and context.
List	execute(int p1, Map context) Convenient method to execute with a single int parameter and context.
List	execute(long p1) Convenient method to execute with a single long parameter.
List	execute(long p1, Map context) Convenient method to execute with a single long parameter and context.
List	execute(Map context) Convenient method to execute without parameters.
List	execute(Object[] params) Convenient method to execute without context.
List	execute(Object[] params, Map context) Central execution method.
List	execute(String p1) Convenient method to execute with a single String parameter.
List	execute(String p1, Map context) Convenient method to execute with a single String parameter and context.
List	executeByNamedParam(Map paramMap) Convenient method to execute without context.
List	executeByNamedParam(Map paramMap, Map context) Central execution method.
Object	findObject(int p1) Convenient method to find a single object given a single int parameter.
Object	findObject(int p1, int p2) Convenient method to find a single object given two int parameters.
Object	findObject(int p1, int p2, Map context) Convenient method to find a single object given two int parameters and a context.
Object	findObject(int p1, Map context) Convenient method to find a single object given a single int parameter and a context.
Object	findObject(long p1) Convenient method to find a single object given a single long parameter.
Object	findObject(long p1, Map context) Convenient method to find a single object given a single long parameter and a context.
Object	findObject(Object[] params) Convenient method to find a single object without context.
Object	findObject(Object[] params, Map context) Generic object finder method, used by all other findObject methods.
Object	findObject(String p1) Convenient method to find a single object given a single String parameter.
Object	findObject(String p1, Map context) Convenient method to find a single object given a single String parameter and a context.
Object	findObjectByNamedParam(Map paramMap) Convenient method to execute without context.
Object	findObjectByNamedParam(Map paramMap, Map context) Generic object finder method for named parameters.
int	getRowsExpected() Get the number of rows expected.
protected abstract RowMapper	newRowMapper(Object[] parameters, Map context) Subclasses must implement this method to extract an object per row, to be returned by the execute method as an aggregated List.
void	setRowsExpected(int rowsExpected) Set the number of rows expected.

Methods inherited from class org.springframework.jdbc.object.SqlOperation

compileInternal, getParsedSql, newPreparedStatementCreator, newPreparedStatementCreator, newPreparedStatementSetter, onCompileInternal

Methods inherited from class org.springframework.jdbc.object.RdbmsOperation

afterPropertiesSet, allowsUnusedParameters, checkCompiled, compile, declareParameter, getDeclaredParameters, getGeneratedKeysColumnNames, getJdbcTemplate, getResultSetType, getSql, isCompiled, isReturnGeneratedKeys, isUpdatableResults, setDataSource, setFetchSize, setGeneratedKeysColumnNames, setJdbcTemplate, setMaxRows, setParameters, setQueryTimeout, setResultSetType, setReturnGeneratedKeys, setSql, setTypes, setUpdatableResults, supportsLobParameters, validateNamedParameters, validateParameters

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SqlQuery

public SqlQuery()

Constructor to allow use as a JavaBean.

The DataSource and SQL must be supplied before compilation and use.

SqlQuery

public SqlQuery(DataSource ds,
                String sql)

Convenient constructor with a DataSource and SQL string.

Parameters:

ds - the DataSource to use to get connections

sql - the SQL to execute; SQL can also be supplied at runtime by overriding the RdbmsOperation.getSql() method.

Method Detail

setRowsExpected

public void setRowsExpected(int rowsExpected)

Set the number of rows expected.

This can be used to ensure efficient storage of results. The default behavior is not to expect any specific number of rows.

getRowsExpected

public int getRowsExpected()

Get the number of rows expected.

execute

public List execute(Object[] params,
                    Map context)
             throws DataAccessException

Central execution method. All un-named parameter execution goes through this method.

Parameters:

params - parameters, similar to JDO query parameters. Primitive parameters must be represented by their Object wrapper type. The ordering of parameters is significant.

context - contextual information passed to the mapRow callback method. The JDBC operation itself doesn't rely on this parameter, but it can be useful for creating the objects of the result list.

Returns:

a List of objects, one per row of the ResultSet. Normally all these will be of the same class, although it is possible to use different types.

Throws:

DataAccessException

execute

public List execute(Object[] params)
             throws DataAccessException

Convenient method to execute without context.

Parameters:

params - parameters for the query. Primitive parameters must be represented by their Object wrapper type. The ordering of parameters is significant.

Throws:

DataAccessException

execute

public List execute(Map context)
             throws DataAccessException

Convenient method to execute without parameters.

Parameters:

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List execute()
             throws DataAccessException

Convenient method to execute without parameters nor context.

Throws:

DataAccessException

execute

public List execute(int p1,
                    Map context)
             throws DataAccessException

Convenient method to execute with a single int parameter and context.

Parameters:

p1 - single int parameter

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List execute(int p1)
             throws DataAccessException

Convenient method to execute with a single int parameter.

Parameters:

p1 - single int parameter

Throws:

DataAccessException

execute

public List execute(int p1,
                    int p2,
                    Map context)
             throws DataAccessException

Convenient method to execute with two int parameters and context.

Parameters:

p1 - first int parameter

p2 - second int parameter

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List execute(int p1,
                    int p2)
             throws DataAccessException

Convenient method to execute with two int parameters.

Parameters:

p1 - first int parameter

p2 - second int parameter

Throws:

DataAccessException

execute

public List execute(long p1,
                    Map context)
             throws DataAccessException

Convenient method to execute with a single long parameter and context.

Parameters:

p1 - single long parameter

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List execute(long p1)
             throws DataAccessException

Convenient method to execute with a single long parameter.

Parameters:

p1 - single long parameter

Throws:

DataAccessException

execute

public List execute(String p1,
                    Map context)
             throws DataAccessException

Convenient method to execute with a single String parameter and context.

Parameters:

p1 - single String parameter

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List execute(String p1)
             throws DataAccessException

Convenient method to execute with a single String parameter.

Parameters:

p1 - single String parameter

Throws:

DataAccessException

executeByNamedParam

public List executeByNamedParam(Map paramMap,
                                Map context)
                         throws DataAccessException

Central execution method. All named parameter execution goes through this method.

Parameters:

paramMap - parameters associated with the name specified while declaring the SqlParameters. Primitive parameters must be represented by their Object wrapper type. The ordering of parameters is not significant since they are supplied in a SqlParameterMap which is an implementation of the Map interface.

context - contextual information passed to the mapRow callback method. The JDBC operation itself doesn't rely on this parameter, but it can be useful for creating the objects of the result list.

Returns:

a List of objects, one per row of the ResultSet. Normally all these will be of the same class, although it is possible to use different types.

Throws:

DataAccessException

executeByNamedParam

public List executeByNamedParam(Map paramMap)
                         throws DataAccessException

Convenient method to execute without context.

Parameters:

paramMap - parameters associated with the name specified while declaring the SqlParameters. Primitive parameters must be represented by their Object wrapper type. The ordering of parameters is not significant.

Throws:

DataAccessException

findObject

public Object findObject(Object[] params,
                         Map context)
                  throws DataAccessException

Generic object finder method, used by all other findObject methods. Object finder methods are like EJB entity bean finders, in that it is considered an error if they return more than one result.

Returns:

the result object, or null if not found. Subclasses may choose to treat this as an error and throw an exception.

Throws:

DataAccessException

See Also:

DataAccessUtils.singleResult(java.util.Collection)

findObject

public Object findObject(Object[] params)
                  throws DataAccessException

Convenient method to find a single object without context.

Throws:

DataAccessException

findObject

public Object findObject(int p1,
                         Map context)
                  throws DataAccessException

Convenient method to find a single object given a single int parameter and a context.

Throws:

DataAccessException

findObject

public Object findObject(int p1)
                  throws DataAccessException

Convenient method to find a single object given a single int parameter.

Throws:

DataAccessException

findObject

public Object findObject(int p1,
                         int p2,
                         Map context)
                  throws DataAccessException

Convenient method to find a single object given two int parameters and a context.

Throws:

DataAccessException

findObject

public Object findObject(int p1,
                         int p2)
                  throws DataAccessException

Convenient method to find a single object given two int parameters.

Throws:

DataAccessException

findObject

public Object findObject(long p1,
                         Map context)
                  throws DataAccessException

Convenient method to find a single object given a single long parameter and a context.

Throws:

DataAccessException

findObject

public Object findObject(long p1)
                  throws DataAccessException

Convenient method to find a single object given a single long parameter.

Throws:

DataAccessException

findObject

public Object findObject(String p1,
                         Map context)
                  throws DataAccessException

Convenient method to find a single object given a single String parameter and a context.

Throws:

DataAccessException

findObject

public Object findObject(String p1)
                  throws DataAccessException

Convenient method to find a single object given a single String parameter.

Throws:

DataAccessException

findObjectByNamedParam

public Object findObjectByNamedParam(Map paramMap,
                                     Map context)
                              throws DataAccessException

Generic object finder method for named parameters.

Parameters:

paramMap - Map of parameter name to parameter object, matching named parameters specified in the SQL statement. Ordering is not significant.

context - contextual information passed to the mapRow callback method. The JDBC operation itself doesn't rely on this parameter, but it can be useful for creating the objects of the result list.

Returns:

a List of objects, one per row of the ResultSet. Normally all these will be of the same class, although it is possible to use different types.

Throws:

DataAccessException

findObjectByNamedParam

public Object findObjectByNamedParam(Map paramMap)
                              throws DataAccessException

Convenient method to execute without context.

Parameters:

paramMap - Map of parameter name to parameter object, matching named parameters specified in the SQL statement. Ordering is not significant.

Throws:

DataAccessException

newRowMapper

protected abstract RowMapper newRowMapper(Object[] parameters,
                                          Map context)

Subclasses must implement this method to extract an object per row, to be returned by the execute method as an aggregated List.

Parameters:

parameters - the parameters to the execute() method, in case subclass is interested; may be null if there were no parameters.

context - contextual information passed to the mapRow callback method. The JDBC operation itself doesn't rely on this parameter, but it can be useful for creating the objects of the result list.

See Also:

execute(java.lang.Object[], java.util.Map)