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java.lang.Object org.springframework.jdbc.core.ColumnMapRowMapper
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.
JdbcTemplate.queryForList(String)
,
JdbcTemplate.queryForMap(String)
Constructor Summary | |
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ColumnMapRowMapper()
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Method Summary | |
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protected Map |
createColumnMap(int columnCount)
Create a Map instance to be used as column map. |
protected String |
getColumnKey(String columnName)
Determine the key to use for the given column in the column Map. |
protected Object |
getColumnValue(ResultSet rs,
int index)
Retrieve a JDBC object value for the specified column. |
Object |
mapRow(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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ColumnMapRowMapper()
Method Detail |
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public Object mapRow(ResultSet rs, int rowNum) throws SQLException
RowMapper
next()
on
the ResultSet; it is only supposed to map values of the current row.
rs
- the ResultSet to map (pre-initialized for the current row)rowNum
- the number of the current row
SQLException
- if a SQLException is encountered getting
column values (that is, there's no need to catch SQLException)protected Map createColumnMap(int columnCount)
By default, a linked case-insensitive Map will be created if possible, else a plain HashMap (see Spring's CollectionFactory).
columnCount
- the column count, to be used as initial
capacity for the Map
CollectionFactory.createLinkedCaseInsensitiveMapIfPossible(int)
protected String getColumnKey(String columnName)
columnName
- the column name as returned by the ResultSet
ResultSetMetaData.getColumnName(int)
protected Object getColumnValue(ResultSet rs, int index) throws SQLException
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.
rs
- is the ResultSet holding the dataindex
- is the column index
SQLException
JdbcUtils.getResultSetValue(java.sql.ResultSet, int)
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