JDBC操作数据库-增删查改完整版(未封装)

#JDBC未运用：封装、Dao、配置文件properties之前的基本操作:
增加、删除、查询、修改

package JDBCDemo04;
import org.junit.Test;
import java.sql.*;
public class Demo04 {

 //添加
 @Test
public void jdbcAdd() throws Exception{
   //1、加载驱动
    Class.forName("com.mysql.jdbc.Driver");
    //2、创建连接数据库的对象
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?characterEncoding=utf-8",
            "root", "root");
    //3、创建操作数据库的对象，同时写sql语句（添加数据）
    PreparedStatement pst=conn.prepareStatement(         //预编译
            "insert into student08(s_name,s_sex,s_birthday,s_class) " +
            "values(?,?,?,?)");
    //4、追加设置数据到value
    pst.setString(1,"余兵");
    pst.setString(2,"男");
    Date date=new Date(new java.util.Date().getTime());
    pst.setDate(3, date);
    pst.setString(4,"K9501");
    int i=pst.executeUpdate();     //添加数据为单个对象(一条记录),故为整型，以i作判断
    if (i>0){
        System.out.println("添加成功！");
    }
    //释放资源
    pst.close();
    conn.close();
}

//删除    
@Test
public void jdbcDel() throws Exception{
    Class.forName("com.mysql.jdbc.Driver");  //加载驱动
    Connection conn=DriverManager.getConnection(  //创建连接对象
            "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8",
            "root","root"
    );
    String sql="delete from student08 where s_id=?";
    PreparedStatement pst=conn.prepareStatement(sql);
    pst.setInt(1,118);
    pst.executeUpdate();
    conn.close();
}

//修改
@Test
public void jdbcUpdate() throws Exception{
    Class.forName("com.mysql.jdbc.Driver");
    Connection conn = DriverManager.getConnection(
            "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8",
            "root", "root"
    );
    PreparedStatement pst=conn.prepareStatement("update student08 set s_name=? where s_id=?");
    pst.setString(1,"李文豪");
    pst.setInt(2,123);
    pst.executeUpdate();
    conn.close();
}

//查询
@Test
public void jdbcQuery() throws Exception{
    Class.forName("com.mysql.jdbc.Driver");
    Connection conn=DriverManager.getConnection(
            "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8",
            "root","root"
    );
    PreparedStatement pst=conn.prepareStatement("SELECT s_id,s_name,s_sex,s_birthday,s_class from student08");
    ResultSet rs = pst.executeQuery();
    while (rs.next()){
        int id = rs.getInt(1);
        String name = rs.getString(2);
        String sex = rs.getString(3);
        Date date = rs.getDate(4);
        String s_class = rs.getString(5);
        System.out.println(id+","+name+","+sex+","+date+","+s_class);
    }
    conn.close();
}

}