JAVA，自定義MySQL的工具類

package com.fy.utils;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;

public class MySQLUtil {
 private String dataSourceName;
 private DataSource ds;
 public MySQLUtil(String dataSourceName) {
  this.dataSourceName = dataSourceName;
 }
 public MySQLUtil() {
 }
 public void setDataSourceName(String dataSourceName) {
  this.dataSourceName = dataSourceName;
 }
 
 public void init() {
  Context initContext; 
  try {
   initContext = new InitialContext(); 
   ds =(DataSource) initContext.lookup(dataSourceName); 
   } catch(NamingException e){
    e.printStackTrace(); 
   }
 }
 public int update(String sql, String[] params) {
  int result = 0;
  QueryRunner qr = new QueryRunner(ds);
  try {
   result=qr.update(sql, params);
   //result = qr.update(sql, param);
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return result;
 }
 public Object query(String sql, String[] param, ResultSetHandler rsh) {
  QueryRunner qr = new QueryRunner(ds);
  Object result = null;
  try {
   result = qr.query(sql, param, rsh);
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return result;
 }
}