2021/4/5

1.今日收获内容
在web链接数据库

package DBUtil;


import java.sql.*;


public class DBUtil {

    public static String db_url = "jdbc:mysql://localhost:3306/text111?serverTimezone=GMT%2B8&useSSL=false";
    public static String db_user = "root";
    public static String db_pass = "zgq727";

    public static Connection getConn () {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(db_url, db_user,db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return conn;
    }//end getConn

    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws SQLException {
        Connection conn = getConn();
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        
        String sql ="select * from text2";
        pstmt = conn.prepareStatement(sql);
        rs = pstmt.executeQuery();
        if(rs.next()){
            System.out.println("连接成功");
        }else{
            System.out.println("连接失败");
        }
    }
}

连接到数据库

2.遇到的问题
链接无误

3.明天目标

Javasql