日期:2014-05-16  浏览次数:20486 次

操作JDBC的好的apache工具包

Jakarta?Commons的dbutils(http://commons.apache.org/dbutils/?)是很不错的,操作JDBC的工具类,举个例子如下,比较简单

mport java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Iterator;?
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;

public class BeanutilsJDBCTest{
? public static void main(String[] args) {
???????? Connection conn = null;
???????? String jdbcURL = "jdbc:mysql://127.0.0.1:3306/beanutildemo?useUnicode=true&characterEncoding=GBK";
???????? String jdbcDriver = "com.mysql.jdbc.Driver";
???????? try {
???????????? DbUtils.loadDriver(jdbcDriver);
???????????? // Username "root". Password "root"
???????????? conn = DriverManager.getConnection(jdbcURL, "root", "1979621");
???????????? QueryRunner qRunner = new QueryRunner();
???????????? System.out.println("***Using MapListHandler***");
???????????? //以下部分代码采用Map存储方式,可以采用Bean的方式代替进行处理
????????? /** List lMap = (List) qRunner.query(conn,
???????????????????? "select title,authors? from book", new MapListHandler());
???????????? //以下是处理代码,可以抽取出来
?System.out.println("title ------------- authors ");
???????????????? for (int i = 0; i < lMap.size(); i++) {
???????????????????????? Map vals = (Map) lMap.get(i);
???????????????????????? System.out.println(vals.get("title")+"-------------"+ vals.get("authors"));
???????????????? }**/
?????????????
???????????? List lBeans = (List) qRunner.query(conn," select title,authors from book ", new BeanListHandler(Book.class));
???????????? //以下是处理代码,可以抽取出来
???????? System.out.println("title ------------- authors ");
???????????? for (int i = 0; i < lBeans.size(); i++) {
???????????????????? Book vals = (Book) lBeans.get(i);????
?????????????????? System.out.println(vals.getTitle ()+"-------------"+ vals. getAuthors ());
???????????????????????? }

???????? } catch (SQLException ex) {
???????????? ex.printStackTrace();
???????? } finally {
???????????? DbUtils.closeQuietly(conn);
???????? }
???? }

?

2? 还有个很典型的简单替代以前麻烦的用法哦
???? 以前要这样:
???

try {
???stmt = conn.createStatement();
???rs = stmt.executeQuery(strSql);
???
???
??while (rs.next()) {
????DeptVO dept = new DeptVO();
????dept.setId(rs.getInt("id"));
????dept.setName(rs.getString("name"));
????dept.setEmail(rs.getString("email"));
????dept.setTel(rs.getString("tel"));
????dept.setAddress(rs.getString("address"));
????list.add(dept);
??????? }

现在可以这样了

try {
???stmt = conn.createStatement();
???rs = stmt.executeQuery(strSql);
???
??? rsdc = new ResultSetDynaClass(rs,false);
??????? dp = rsdc.getDynaProperties();
??????? rows = rsdc.iterator();

?????????? while(rows.hasNext()){
????? ??? DeptVO dept = new DeptVO();
????? ??? DynaBean row = (DynaBean) rows.next();
???????????? PropertyUtils.copyProperties(dept ,row);
???????????? list.add(dept);

????? ????
???????? }