org.springframework.jdbc.core

Class ColumnMapRowMapper

java.lang.Object

org.springframework.jdbc.core.ColumnMapRowMapper

All Implemented Interfaces:

RowMapper<java.util.Map<java.lang.String,java.lang.Object>>

public class ColumnMapRowMapper
extends java.lang.Object
implements RowMapper<java.util.Map<java.lang.String,java.lang.Object>>

RowMapper implementation that creates a java.util.Map for each row, representing all columns as key-value pairs: one entry for each column, with the column name as key.

The Map implementation to use and the key to use for each column in the column Map can be customized through overriding createColumnMap(int) and getColumnKey(java.lang.String), respectively.

Note: By default, ColumnMapRowMapper will try to build a linked Map with case-insensitive keys, to preserve column order as well as allow any casing to be used for column names. This requires Commons Collections on the classpath (which will be autodetected). Else, the fallback is a standard linked HashMap, which will still preserve column order but requires the application to specify the column names in the same casing as exposed by the driver.

Since:

1.2

Author:

Juergen Hoeller

See Also:

JdbcTemplate.queryForList(String), JdbcTemplate.queryForMap(String)

Constructor Summary

Constructors

Constructor and Description
ColumnMapRowMapper()

Method Summary

Modifier and Type	Method and Description
protected java.util.Map<java.lang.String,java.lang.Object>	createColumnMap(int columnCount) Create a Map instance to be used as column map.
protected java.lang.String	getColumnKey(java.lang.String columnName) Determine the key to use for the given column in the column Map.
protected java.lang.Object	getColumnValue(java.sql.ResultSet rs, int index) Retrieve a JDBC object value for the specified column.
java.util.Map<java.lang.String,java.lang.Object>	mapRow(java.sql.ResultSet rs, int rowNum) Implementations must implement this method to map each row of data in the ResultSet.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnMapRowMapper

public ColumnMapRowMapper()

Method Detail

mapRow

public java.util.Map<java.lang.String,java.lang.Object> mapRow(java.sql.ResultSet rs,
                                                      int rowNum)
                                                        throws java.sql.SQLException

Description copied from interface: RowMapper

Implementations must implement this method to map each row of data in the ResultSet. This method should not call next() on the ResultSet; it is only supposed to map values of the current row.

Specified by:

mapRow in interface RowMapper<java.util.Map<java.lang.String,java.lang.Object>>

Parameters:

rs - the ResultSet to map (pre-initialized for the current row)

rowNum - the number of the current row

Returns:

the result object for the current row

Throws:

java.sql.SQLException - if a SQLException is encountered getting column values (that is, there's no need to catch SQLException)

createColumnMap

protected java.util.Map<java.lang.String,java.lang.Object> createColumnMap(int columnCount)

Create a Map instance to be used as column map.

By default, a linked case-insensitive Map will be created.

Parameters:

columnCount - the column count, to be used as initial capacity for the Map

Returns:

the new Map instance

See Also:

LinkedCaseInsensitiveMap

getColumnKey

protected java.lang.String getColumnKey(java.lang.String columnName)

Determine the key to use for the given column in the column Map.

Parameters:

columnName - the column name as returned by the ResultSet

Returns:

the column key to use

See Also:

ResultSetMetaData.getColumnName(int)

getColumnValue

protected java.lang.Object getColumnValue(java.sql.ResultSet rs,
                              int index)
                                   throws java.sql.SQLException

Retrieve a JDBC object value for the specified column.

The default implementation uses the getObject method. Additionally, this implementation includes a "hack" to get around Oracle returning a non standard object for their TIMESTAMP datatype.

Parameters:

rs - is the ResultSet holding the data

index - is the column index

Returns:

the Object returned

Throws:

java.sql.SQLException

See Also:

JdbcUtils.getResultSetValue(java.sql.ResultSet, int, java.lang.Class)