Wraps a ResultSet to trim strings returned by the getString() and getObject() methods. : ResultSet « Database SQL JDBC « Java

Wraps a ResultSet to trim strings returned by the getString() and getObject() methods.

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.ResultSet;

 * Wraps a <code>ResultSet</code> to trim strings returned by the
 * <code>getString()</code> and <code>getObject()</code> methods.
 * <p>
 * Usage Example:
 * This example shows how to decorate ResultSets so processing continues as 
 * normal but all Strings are trimmed before being returned from the 
 * <code>ResultSet</code>.
 * </p>
 * <pre>
 * ResultSet rs = // somehow get a ResultSet;
 * // Substitute wrapped ResultSet with additional behavior for real ResultSet
 * rs = StringTrimmedResultSet.wrap(rs);
 * // Pass wrapped ResultSet to processor
 * List list = new BasicRowProcessor().toBeanList(rs);
 * </pre>
public class StringTrimmedResultSet implements InvocationHandler {

     * The wrapped result. 
    private final ResultSet rs;

     * Constructs a new instance of <code>StringTrimmedResultSet</code>
     * to wrap the specified <code>ResultSet</code>.
     * @param rs ResultSet to wrap
    public StringTrimmedResultSet(ResultSet rs) {
        this.rs = rs;

     * Intercept calls to the <code>getString()</code> and 
     * <code>getObject()</code> methods and trim any Strings before they're
     * returned.
     * @throws Throwable
     * @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
    public Object invoke(Object proxy, Method method, Object[] args)
        throws Throwable {

        Object result = method.invoke(this.rs, args);

        if (method.getName().equals("getObject")
            || method.getName().equals("getString")) {

            if (result instanceof String) {
                result = ((String) result).trim();

        return result;



Related examples in the same category

1.ResultSet getter Methods
2.ResultSet Update Methods
3.Get Column Count In ResultSet
4.Get available ResultSet types
5.Get BLOB data from resultset
6.ResultSet Update
7.Results Decorator XML
8.Results Decorator Text
9.Results Decorator SQL
10.Print ResultSet in HTML
11.Demonstrate simple use of the CachedRowSet
12.Metadata for ResultSet
13.Scrollable ResultSet
14.Concurrency in ResultSet
15.SQL statement: ResultSet and ResultSetMetaData
16.Output data from table
17.Convert a ResultSet to XML
18.Retrieve a rowcount from a ResultSet
19.Wraps a ResultSet in an Iterator.
20.Decorates a ResultSet with checks for a SQL NULL value on each getXXX method.