java操作数据库的基本方法

此次开发工具为eclipse,才有的数据库驱动是mysql-connector-java-5.1.8-bin.jar

第一步,在eclipse的工程目录中引用mysql驱动

驱动下载地址:https://dev.mysql.com/downloads/connector/j/

选择build path 然后选择configure build path

再选择libraries,选择add external library,找到之前下的数据库驱动,确认,ok

然后下一段测试代码将数据库驱动起来

public class test {

    public static void main(String []args) {
        try {
            //mysql数据库设置驱动程序类型
            Class.forName("com.mysql.jdbc.Driver"); 
            System.out.println("mysql数据库驱动加载成功");
            
            
        }
        catch(ClassNotFoundException e) {
            e.printStackTrace();
        }    
    }
}

驱动代码运行一次就行了,之后就是操作数据库了

基本操作增改删查,原理都是一样的

先创建一个Connection对象

Connection connection = null;
String user="root";//用户名
String password="19980713";//密码
String url = "jdbc:mysql://localhost:3306/task?user="+user+"&password="+password+"&useUnicode=true&characterEncoding=utf-8";//获得连接的语句
try{
     connection = (Connection)DriverManager.getConnection(url);
   }catch(SQLException e){
      e.printStackTrace();
   }

获得连接之后就是对connection进行操作了

查询记录

String sql = "select id,name,job,department,state,authority from worker;";
try {
                    
                    PreparedStatement ps = (PreparedStatement) connection.prepareStatement(sql);//预编译过程
                    ResultSet rs = ps.executeQuery();//查询一般用executeQuery,返回的是查询的结果集
                    //下面是对结果集进行操作
                     while(rs.next()) {
                         count++;
                         Vector v = new Vector();
                         v.add((rs.getString(1)));
                         v.add((rs.getString(2)));
                         v.add((rs.getString(3)));
                         v.add((rs.getString(4)));
                         v.add((rs.getString(5)));
                         v.add((rs.getString(6)));
                         worker.add(v);
                     }
                }catch(SQLException e1) {
                    e1.printStackTrace();
                }

插入记录

String sql = "insert into worker(name) "
					+"value("+ ""\"小明"\"" + ")";
PreparedStatement ps = (PreparedStatement) connection.prepareStatement(sql);
try {
						PreparedStatement ps = (PreparedStatement) connection.prepareStatement(sql);
						if(ps.executeUpdate()==1){//返回一个int值表示返回的条数
							int n = JOptionPane.showConfirmDialog(null, "添加成功,是否继续添加?", "系统提示",JOptionPane.YES_NO_OPTION); 
							if(n == 0){
								//清空面板
								name.setText("");
								sex.setText("");
								authority.setText("");
								birthday.setText("");
								department.setText("");
								job.setText("");
								email.setText("");
								state.setText("");
								remark.setText("");
								specialty.setText("");
								address.setText("");
								tel.setText("");
								edu_level.setText("");
							}else{
								dispose();
								JoinNewMember frame = new JoinNewMember();
							}
						}
					} catch (SQLException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					}

java操作数据库的基本方法

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