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SqlQuery (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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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

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public abstract class SqlQuery
extends SqlOperation

Reusable object to represent a SQL query.

Subclasses must implement the newResultReader method to provide an object that can extract the results of iterating over the ResultSet.

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 threadsafe 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, Jean-Pierre Pawlak

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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.
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.
int	getRowsExpected()           Get the number of rows expected.
protected abstract  ResultReader	newResultReader(int rowsExpected, Object[] parameters, Map context)           Subclasses must implement this method to save a List of objects returned by the execute method.
void	setRowsExpected(int rowsExpected)           Set the number of rows expected.

 

Methods inherited from class org.springframework.jdbc.object.SqlOperation
compileInternal, 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, setResultSetType, setReturnGeneratedKeys, setSql, setTypes, setUpdatableResults, supportsLobParameters, 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.

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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.

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getRowsExpected

public int getRowsExpected()

Get the number of rows expected.

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execute

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

Central execution method. All 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

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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

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execute

public List execute(Map context)
             throws DataAccessException

Convenient method to execute without parameters.

Parameters:

context - the contextual information for object creation

Throws:

DataAccessException

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execute

public List execute()
             throws DataAccessException

Convenient method to execute without parameters nor context.

Throws:

DataAccessException

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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

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execute

public List execute(int p1)
             throws DataAccessException

Convenient method to execute with a single int parameter.

Parameters:

p1 - single int parameter

Throws:

DataAccessException

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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

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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

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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

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execute

public List execute(long p1)
             throws DataAccessException

Convenient method to execute with a single long parameter.

Parameters:

p1 - single long parameter

Throws:

DataAccessException

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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

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execute

public List execute(String p1)
             throws DataAccessException

Convenient method to execute with a single String parameter.

Parameters:

p1 - single String parameter

Throws:

DataAccessException

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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)

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findObject

public Object findObject(Object[] params)
                  throws DataAccessException

Convenient method to find a single object without context.

Throws:

DataAccessException

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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

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findObject

public Object findObject(int p1)
                  throws DataAccessException

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

Throws:

DataAccessException

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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

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findObject

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

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

Throws:

DataAccessException

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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

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findObject

public Object findObject(long p1)
                  throws DataAccessException

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

Throws:

DataAccessException

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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

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findObject

public Object findObject(String p1)
                  throws DataAccessException

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

Throws:

DataAccessException

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newResultReader

protected abstract ResultReader newResultReader(int rowsExpected,
                                                Object[] parameters,
                                                Map context)

Subclasses must implement this method to save a List of objects returned by the execute method.

Parameters:

rowsExpected - If 0, we don't know how many rows to expect. This parameter can be ignored, but may help some implementations choose the most efficient Collection type: e.g. ArrayList instead of LinkedList for large result sets.

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

See Also:

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

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