当运用PHP在MySQL中编写查询时,它的适用性将基于MySQL自身进行搜检。所以运用MySQL供应的默许日期和时候花样,即'YYYY-MM-DD'
例子:
ATE: YYYY-MM-DD Example: 2019-01-28 DATETIME: YYYY-MM-DD HH:MI:SS Example: 2019-01-28 23:50:30 TIMESTAMP: YYYY-MM-DD HH:MI:SS Example: 2019-01-28 23:50:30 YEAR: YYYY or YY
用于建立DataBase的MySQL查询:
CREATE DATABASE Date_time_example;
示例1:用于建立数据库和表的PHP顺序
<?php $servername = "localhost"; $username = "root"; $password = ""; $dbname = "test"; // 建立衔接 $conn = mysqli_connect( $servername, $username, $password, $dbname ); // 搜检衔接 if ( !$conn ) { die("Connection failed: " . mysqli_connect_error()); } // 建立表的SQL查询 $sql = "CREATE TABLE date_test ( id INT AUTO_INCREMENT PRIMARY KEY, created_at DATETIME )"; if (mysqli_query($conn, $sql)) { echo "Table date_test created successfully"; } else { echo "Error creating table: " . mysqli_error($conn); } // 封闭衔接 mysqli_close($conn);
输出:
Table date_test created successfully
示例2:将日期插进去表中的PHP顺序。
<?php $servername = "localhost"; $username = "root"; $password = ""; $dbname = "test"; // 建立衔接 $conn = mysqli_connect( $servername, $username, $password, $dbname ); // 搜检衔接 if ( !$conn ) { die("Connection failed: " . mysqli_connect_error()); } // 用于向表中插进去数据的SQL查询 $sql = "INSERT INTO date_test( created_at ) VALUES( '2019-01-28 12:39:16' );"; if (mysqli_query($conn, $sql)) { echo "New record created successfully"; } else { echo "Error: " . $sql . "<br>" . mysqli_error($conn); } // 封闭衔接 mysqli_close($conn);
输出:
New record created successfully
示例3:此示例用于显现在2019-01-28上建立的行。运用以下查询显现效果。created_at列不仅包括日期,还包括时候。所以它会显现错误信息。
SELECT * FROM date_test WHERE DATE( created_at ) = '2019-01-28';
<?php $servername = "localhost"; $username = "root"; $password = ""; $dbname = "test"; //建立衔接 $conn = mysqli_connect( $servername, $username, $password, $dbname ); // 搜检衔接 if ( !$conn ) { die("Connection failed: " . mysqli_connect_error()); } //SQL查询 $sql = "SELECT * FROM date_test WHERE DATE(created_at) = '2019-01-28'"; $result = mysqli_query( $conn, $sql ); if ($result) { echo $result; //打印查询效果 } else { echo "Error: " . $sql . "<br>" . mysqli_error($conn); } // 封闭衔接 mysqli_close($conn);
输出:
id created_at 1 2019-01-28 12:39:16
要从DATETIME值猎取年,季度,月,周,日,小时,分钟和秒,请运用以下语句中显现的函数:
HOUR(@dt),MINUTE(@dt),SECOND(@dt) ),DAY(@dt),WEEK(@dt),MONTH(@dt),QUARTER(@dt),YEAR(@dt);
引荐参考进修:
《PHP教程》http://www.ki4.cn/course/list/29.html
《mysql教程》http://www.ki4.cn/course/list/51.html
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