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Java连接MySQL随笔
//连接时要注意所有jar,以及环境搭建好;
package util;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
public class Jdbc {
public static void main(String[] args){
// 驱动程序名
String driver = "com.mysql.jdbc.Driver";
// URL指向要访问的数据库名scutcs
String url = "jdbc:mysql://127.0.0.1:3306/golden";
// MySQL配置时的用户名
String user = "root";
// Java连接MySQL配置时的密码
String password = "1234";
try {
// 加载驱动程序
Class.forName(driver);
// 连续数据库
Connection conn = (Connection) DriverManager.getConnection(url, user, password);
if(!conn.isClosed())
System.out.println("已成功连接!");
// statement用来执行SQL语句
Statement statement = (Statement) conn.createStatement();
// 要执行的SQL语句
String sql = "select * from golden.users";
//结果集
ResultSet rs = statement.executeQuery(sql);
System.out.println("----------------------------------");
System.out.println("执行结果如下所示:");
System.out.println("----------------------------------");
System.out.println(" UsersId" + "\t" + "UsersName"+ "\t" + "pwd"+ "\t" + "age");
System.out.println("----------------------------------");
String usersName = null;
String pwd=null;
Integer age=0;
while(rs.next()) {
//选择数据
usersName = rs.getString("usersName");
pwd=rs.getString("pwd");
age=rs.getInt(4); //索引,也可用age;
// 输出结果
System.out.println(rs.getString("usersId") + "\t" + usersName+ "\t" + pwd+ "\t" + age);
}
rs.close();
conn.close();
} catch(ClassNotFoundException e) {
System.out.println("Sorry,can`t find the Driver!");
e.printStackTrace();
} catch(SQLException e) {
e.printStackTrace();
} catch(Exception e) {
e.printStackTrace();
}
}
}