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PHP date()格式MySQL中插入datetime方法

程序员文章站 2023-01-04 17:39:10
当使用php在mysql中编写查询时,它的适用性将基于mysql本身进行检查。所以使用mysql提供的默认日期和时间格式,即'yyyy-mm-dd' 例子: a...

当使用php在mysql中编写查询时,它的适用性将基于mysql本身进行检查。所以使用mysql提供的默认日期和时间格式,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

用于创建database的mysql查询:

create database date_time_example;

示例1:用于创建数据库和表的php程序

<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "test"; 
  
// 创建连接
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// 检查连接 
if ( !$conn ) { 
  die("connection failed: " . mysqli_connect_error()); 
} 
  
// 创建表的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); 
} 
  
// 关闭连接
mysqli_close($conn);

输出:

table date_test created successfully

示例2:将日期插入表中的php程序。

<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "test"; 
  
// 创建连接 
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// 检查连接
if ( !$conn ) { 
  die("connection failed: " . mysqli_connect_error()); 
} 
  
// 用于向表中插入数据的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); 
} 
  
// 关闭连接
mysqli_close($conn);

输出:

new record created successfully

示例3:此示例用于显示在2019-01-28上创建的行。使用以下查询显示结果。created_at列不仅包含日期,还包含时间。所以它会显示错误信息。

select * from date_test where date( created_at ) = '2019-01-28';
<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "test"; 
  
//创建连接 
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// 检查连接
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; //打印查询结果 
} 
else { 
  echo "error: " . $sql . "<br>" . mysqli_error($conn); 
} 
  
// 关闭连接
mysqli_close($conn);

输出:

id created_at
1  2019-01-28 12:39:16

要从datetime值获取年,季度,月,周,日,小时,分钟和秒,请使用以下语句中显示的函数:
hour(@dt),minute(@dt),second(@dt) ),day(@dt),week(@dt),month(@dt),quarter(@dt),year(@dt);