Package org.springframework.jdbc.object

Class UpdatableSqlQuery<T>

java.lang.Object

org.springframework.jdbc.object.RdbmsOperation

org.springframework.jdbc.object.SqlOperation

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

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

Type Parameters:

T - the result type

All Implemented Interfaces:

InitializingBean

public abstract class UpdatableSqlQuery<T>
extends SqlQuery<T>

Reusable RDBMS query in which concrete subclasses must implement the abstract updateRow(ResultSet, int, context) method to update each row of the JDBC ResultSet and optionally map contents into an object.

Subclasses can be constructed providing SQL, parameter types and a DataSource. SQL will often vary between subclasses.

Author:

Thomas Risberg

See Also:

• SqlQuery

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	UpdatableSqlQuery.RowMapperImpl	Implementation of RowMapper that calls the enclosing class's updateRow() method for each row.

Field Summary

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

logger

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected RowMapper<T>	newRowMapper(Object[] parameters, Map<?,?> context)	Implementation of the superclass template method.
protected abstract T	updateRow(ResultSet rs, int rowNum, Map<?,?> context)	Subclasses must implement this method to update each row of the ResultSet and optionally create object of the result type.

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

execute, execute, execute, execute, execute, execute, execute, execute, execute, execute, execute, execute, executeByNamedParam, executeByNamedParam, findObject, findObject, findObject, findObject, findObject, findObject, findObject, findObject, findObject, findObject, findObjectByNamedParam, findObjectByNamedParam, getRowsExpected, setRowsExpected

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

UpdatableSqlQuery

public UpdatableSqlQuery()

Constructor to allow use as a JavaBean.

UpdatableSqlQuery

public UpdatableSqlQuery(DataSource ds,
 String sql)

Convenient constructor with DataSource and SQL string.

Parameters:

ds - the DataSource to use to get connections

sql - the SQL to run

Method Details

newRowMapper

protected RowMapper<T> newRowMapper(@Nullable
 Object[] parameters,
 @Nullable
 Map<?,?> context)

Implementation of the superclass template method. This invokes the subclass's implementation of the updateRow() method.

Specified by:

newRowMapper in class SqlQuery<T>

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:

• SqlQuery.execute(java.lang.Object[], java.util.Map<?, ?>)

updateRow

protected abstract T updateRow(ResultSet rs,
 int rowNum,
 @Nullable
 Map<?,?> context)
                        throws SQLException

Subclasses must implement this method to update each row of the ResultSet and optionally create object of the result type.

Parameters:

rs - the ResultSet we're working through

rowNum - row number (from 0) we're up to

context - passed to the execute() method. It can be null if no contextual information is need. If you need to pass in data for each row, you can pass in a HashMap with the primary key of the row being the key for the HashMap. That way it is easy to locate the updates for each row

Returns:

an object of the result type

Throws:

SQLException - if there's an error updating data. Subclasses can simply not catch SQLExceptions, relying on the framework to clean up.