JDBC 8.0 和 JDBC 5.0 区别

ゞ浴缸里的玫瑰 2022-03-14 10:12 259阅读 0赞

# 8.0要写的版本  #

package test;
    import java.sql.*;
    
    public class SqlHelper {
        //mysql驱动包名
        private static final String DRIVER_NAME = "com.mysql.cj.jdbc.Driver";
        //数据库连接地址
        private static final String URL = "jdbc:mysql://localhost:3306/kk?useSSL=false&serverTimezone=GMT" +
                "&allowPublicKeyRetrieval=true";
        //用户名
        private static final String USER_NAME = "joker";
        //密码
        private static final String PASSWORD = "123456789";
    
    
        public static Connection Getconnection() {
            Connection connection = null;
            try {
    
                //加载mysql的驱动类
                Class.forName(DRIVER_NAME);
    
                //获取数据库连接
                connection = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println("没有成功连接");
            }
            return connection;
        }
    
        public ResultSet SqlRead(String sql, String[] parameter) {
    
            Connection connection = null;
            PreparedStatement pr = null;
            ResultSet rs = null;
            try {
    
                //获取数据库连接
                connection = Getconnection();
    
                //mysql查询语句
                pr = connection.prepareStatement(sql);
    
                if (parameter.length > 0) {
                    for (int i = 0; i < parameter.length; i++) {
                        pr.setString(i + 1, parameter[i]);
                    }
                }
                //结果集
                rs = pr.executeQuery();
    
                //打印数据的信息
                while (rs.next()) {
                    System.out.println(rs.getString(1));
                }
    
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                Closesql(connection, pr, rs);
            }
            return rs;
        }
    
    
        //关闭数据库
        public static void Closesql(Connection connection, PreparedStatement pr, ResultSet rs) {
    
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (pr != null) {
                try {
                    pr.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    
        public boolean SqlUpdate(String sql, String[] parameter) {
            boolean result = false;
            Connection connection = null;
            PreparedStatement pr = null;
            ResultSet rs = null;
            try {
                //获取数据库连接
                connection = Getconnection();
                //mysql查询语句
                pr = connection.prepareStatement(sql);
                if (parameter.length > 0) {
                    for (int i = 0; i < parameter.length; i++) {
                        pr.setString(i + 1, parameter[i]);
                    }
                }
               
                int num = pr.executeUpdate();
                if (num > 0) {
                    result = true;
                    System.out.println("数据更新成功");
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                Closesql(connection, pr, rs);
            }
            return result;
        }
    }

package test;
    public class Demo11 {
        public static void main(String[] args){
    
    
             //这个是数据的查找
            String sql="select * from cc where id=?";
            SqlHelper sqlHelper=new SqlHelper();
            String []parameter={"4"};
            sqlHelper.SqlRead(sql,parameter);
            
            //这个是数据的更新
    
            sql="insert into cc values(?,?,?)";
            String []kk={"kk","7","78"};
            sqlHelper.SqlUpdate(sql,kk);
        }
    }

8.0使用的是com.mysql.cj.jdbc.Driver，5.0使用的是com.mysql.jdbc.Driver。

不仅如此，还有时区的限制，URL 里面也有很多要添加的东西

//mysql驱动包名
    private static final String DRIVER_NAME = "com.mysql.cj.jdbc.Driver";
    
    //    //数据库连接地址
    private static final String URL = "jdbc:mysql://localhost:3306/kk?useSSL=false&serverTimezone=GMT" +
            "&allowPublicKeyRetrieval=true";

因为mysql 版本的更新，以前的视频就有些不管用。