【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();
}
}
}