Package org.springframework.jdbc.object

Class SqlQuery<T>

java.lang.Object

org.springframework.jdbc.object.RdbmsOperation

org.springframework.jdbc.object.SqlOperation

org.springframework.jdbc.object.SqlQuery<T>

Type Parameters:

T - the result type

All Implemented Interfaces:

InitializingBean

Direct Known Subclasses:

GenericSqlQuery, MappingSqlQueryWithParameters, UpdatableSqlQuery

public abstract class SqlQuery<T>
extends SqlOperation

Reusable operation object representing an 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

Constructors

Constructor	Description
SqlQuery()	Constructor to allow use as a JavaBean.
SqlQuery(DataSource ds, String sql)	Convenient constructor with a DataSource and SQL string.

Method Summary

Modifier and Type	Method	Description
List<T>	execute()	Convenient method to execute without parameters nor context.
List<T>	execute(int p1)	Convenient method to execute with a single int parameter.
List<T>	execute(int p1, int p2)	Convenient method to execute with two int parameters.
List<T>	execute(int p1, int p2, Map<?,?> context)	Convenient method to execute with two int parameters and context.
List<T>	execute(int p1, Map<?,?> context)	Convenient method to execute with a single int parameter and context.
List<T>	execute(long p1)	Convenient method to execute with a single long parameter.
List<T>	execute(long p1, Map<?,?> context)	Convenient method to execute with a single long parameter and context.
List<T>	execute(Object... params)	Convenient method to execute without context.
List<T>	execute(Object[] params, Map<?,?> context)	Central execution method.
List<T>	execute(String p1)	Convenient method to execute with a single String parameter.
List<T>	execute(String p1, Map<?,?> context)	Convenient method to execute with a single String parameter and context.
List<T>	execute(Map<?,?> context)	Convenient method to execute without parameters.
List<T>	executeByNamedParam(Map<String,?> paramMap)	Convenient method to execute without context.
List<T>	executeByNamedParam(Map<String,?> paramMap, Map<?,?> context)	Central execution method.
T	findObject(int p1)	Convenient method to find a single object given a single int parameter.
T	findObject(int p1, int p2)	Convenient method to find a single object given two int parameters.
T	findObject(int p1, int p2, Map<?,?> context)	Convenient method to find a single object given two int parameters and a context.
T	findObject(int p1, Map<?,?> context)	Convenient method to find a single object given a single int parameter and a context.
T	findObject(long p1)	Convenient method to find a single object given a single long parameter.
T	findObject(long p1, Map<?,?> context)	Convenient method to find a single object given a single long parameter and a context.
T	findObject(Object... params)	Convenient method to find a single object without context.
T	findObject(Object[] params, Map<?,?> context)	Generic object finder method, used by all other findObject methods.
T	findObject(String p1)	Convenient method to find a single object given a single String parameter.
T	findObject(String p1, Map<?,?> context)	Convenient method to find a single object given a single String parameter and a context.
T	findObjectByNamedParam(Map<String,?> paramMap)	Convenient method to execute without context.
T	findObjectByNamedParam(Map<String,?> paramMap, Map<?,?> context)	Generic object finder method for named parameters.
int	getRowsExpected()	Get the number of rows expected.
protected abstract RowMapper<T>	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, resolveSql, 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 Details

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 Details

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<T> execute(@Nullable
 Object[] params,
 @Nullable
 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 - the 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<T> 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<T> execute(Map<?,?> context)
                throws DataAccessException

Convenient method to execute without parameters.

Parameters:

context - the contextual information for object creation

Throws:

DataAccessException

execute

public List<T> execute()
                throws DataAccessException

Convenient method to execute without parameters nor context.

Throws:

DataAccessException

execute

public List<T> execute(int p1,
 @Nullable
 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<T> execute(int p1)
                throws DataAccessException

Convenient method to execute with a single int parameter.

Parameters:

p1 - single int parameter

Throws:

DataAccessException

execute

public List<T> execute(int p1,
 int p2,
 @Nullable
 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<T> 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<T> execute(long p1,
 @Nullable
 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<T> execute(long p1)
                throws DataAccessException

Convenient method to execute with a single long parameter.

Parameters:

p1 - single long parameter

Throws:

DataAccessException

execute

public List<T> execute(String p1,
 @Nullable
 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<T> execute(String p1)
                throws DataAccessException

Convenient method to execute with a single String parameter.

Parameters:

p1 - single String parameter

Throws:

DataAccessException

executeByNamedParam

public List<T> executeByNamedParam(Map<String,?> paramMap,
 @Nullable
 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 - the 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<T> executeByNamedParam(Map<String,?> 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

@Nullable
public T findObject(@Nullable
 Object[] params,
 @Nullable
 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<T>)

findObject

@Nullable
public T findObject(Object... params)
             throws DataAccessException

Convenient method to find a single object without context.

Throws:

DataAccessException

findObject

@Nullable
public T findObject(int p1,
 @Nullable
 Map<?,?> context)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(int p1)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(int p1,
 int p2,
 @Nullable
 Map<?,?> context)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(int p1,
 int p2)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(long p1,
 @Nullable
 Map<?,?> context)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(long p1)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(String p1,
 @Nullable
 Map<?,?> context)
             throws DataAccessException

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

Throws:

DataAccessException

findObject

@Nullable
public T findObject(String p1)
             throws DataAccessException

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

Throws:

DataAccessException

findObjectByNamedParam

@Nullable
public T findObjectByNamedParam(Map<String,?> paramMap,
 @Nullable
 Map<?,?> context)
                         throws DataAccessException

Generic object finder method for named parameters.

Parameters:

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

context - the 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

@Nullable
public T findObjectByNamedParam(Map<String,?> paramMap)
                         throws DataAccessException

Convenient method to execute without context.

Parameters:

paramMap - a 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<T> newRowMapper(@Nullable
 Object[] parameters,
 @Nullable
 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 - the 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<?, ?>)