【Java】JDBCUtil模板

 package jdbc;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import org.junit.Test;
 import com.mysql.jdbc.Driver;

 public class JDBCUtil {

 public void ExecuteQuery() {
 Connection conn = null;
 Statement stmt = null;
 ResultSet rs = null;
 String url = null;
 String user = null;
 String password = null;
 String sql = null;
 try {
 Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动
 } catch (ClassNotFoundException e) {
 System.out.println("驱动加载错误");
 e.printStackTrace();//打印出错详细信息
 }
 try {
 url =
 "jdbc:mysql://WIN-7ERP:3306/msk_dev?user=root&password=Root123&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";//简单写法：url = "jdbc:myqsl://WIN-7ERP:3306/msk_dev? user=root(用户)&password=Root123(密码)";
 user = "root";
 password = "Root123";
 conn = DriverManager.getConnection(url,user,password);
 } catch (SQLException e) {
 System.out.println("数据库链接错误");
 e.printStackTrace();
 }
 try {
 stmt = conn.createStatement();
 sql = "select*from wq_customer";
 rs = stmt.executeQuery(sql);//执行sql语句
 while(rs.next()) {
 System.out.print(rs.getString(1) + " ");
 System.out.print(rs.getString(2) + " ");
 System.out.println(rs.getString(3) + " ");
 }
 } catch (SQLException e) {
 System.out.println("数据操作错误");
 e.printStackTrace();
 }
 //关闭数据库
 try {
 if(rs != null) {
 rs.close();
 rs = null;
 }
 if(stmt != null) {
 stmt.close();
 stmt = null;
 }
 if(conn != null) {
 conn.close();
 conn = null;
 }
 } catch(Exception e) {
 System.out.println("数据库关闭错误");
 e.printStackTrace();
 }
 }
 }