MySQL 插入
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插入数据
要将数据插入MySQL表,您需要使用SQL INSERT INTO命令。您可以使用mysql>提示符或使用任何脚本(如PHP)将数据插入MySQL表。这是INSERT INTO命令的通用SQL语法,用于将数据插入MySQL表INSERT INTO table_name ( field1, field2,...fieldN ) VALUES ( value1, value2,...valueN );
注意:要插入字符串数据类型,需要将所有值都保留在双引号或单引号中。例如“value”。
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从命令提示符插入数据
要从命令提示符处插入数据,我们将使用SQL INSERT INTO命令将数据插入MySQL表tutorials_tbl。例 下面的示例将在tutorials_tbl表中创建3条记录root@host# mysql -u root -p password; Enter password:******* mysql> use TUTORIALS; Database changed mysql> INSERT INTO tutorials_tbl ->(tutorial_title, tutorial_author, submission_date) ->VALUES ->("Learn PHP", "John Poul", NOW()); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO tutorials_tbl ->(tutorial_title, tutorial_author, submission_date) ->VALUES ->("Learn MySQL", "Abdul S", NOW()); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO tutorials_tbl ->(tutorial_title, tutorial_author, submission_date) ->VALUES ->("JAVA Tutorial", "Sanjay", '2007-05-06'); Query OK, 1 row affected (0.01 sec) mysql>
注意 – MySQL不会终止命令,直到在SQL命令的末尾加上分号(;)为止。
注意:所有箭头符号(->)都不是SQL命令的一部分。它们表示新行,它们是由MySQL提示符自动创建的,同时按下Enter键,而无需在命令的每一行末尾添加分号。在上面的示例中,我们没有提供tutorial_id,因为在创建表时,我们为此字段提供了AUTO_INCREMENT选项。因此,MySQL负责自动插入这些ID。在这里,NOW()是一个MySQL函数,它返回当前日期和时间。
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使用PHP脚本删除表
您可以在PHP函数mysqli_query()中使用相同的SQL INSERT INTO命令,以将数据插入MySQL表。例 - 此示例将从用户那里获取三个参数,并将其插入到MySQL表中<html> <head> <title>Add New Record in MySQL Database</title> </head> <body> <?php if(isset($_POST['add'])) { $dbhost = 'localhost'; $dbuser = 'root'; $dbpass = 'rootpassword'; $conn = mysqli_connect($dbhost, $dbuser, $dbpass); if(! $conn ) { die('Could not connect: ' . mysqli_error($conn)); } if(! get_magic_quotes_gpc() ) { $tutorial_title = addslashes ($_POST['tutorial_title']); $tutorial_author = addslashes ($_POST['tutorial_author']); } else { $tutorial_title = $_POST['tutorial_title']; $tutorial_author = $_POST['tutorial_author']; } $submission_date = $_POST['submission_date']; $sql = "INSERT INTO tutorials_tbl ". "(tutorial_title,tutorial_author, submission_date) "."VALUES ". "('$tutorial_title','$tutorial_author','$submission_date')"; mysqli_select_db($conn,'mydb'); $retval = mysqli_query($conn, $sql); if(! $retval ) { die('Could not enter data: ' . mysqli_error($conn)); } echo "Entered data successfully\n"; mysqli_close($conn); } else { ?> <form method = "post" action = "<?php $_PHP_SELF ?>"> <table width = "600" border = "0" cellspacing = "1" cellpadding = "2"> <tr> <td width = "250">Tutorial Title</td> <td> <input name = "tutorial_title" type = "text" id = "tutorial_title"> </td> </tr> <tr> <td width = "250">Tutorial Author</td> <td> <input name = "tutorial_author" type = "text" id = "tutorial_author"> </td> </tr> <tr> <td width = "250">Submission Date [ yyyy-mm-dd ]</td> <td> <input name = "submission_date" type = "text" id = "submission_date"> </td> </tr> <tr> <td width = "250"> </td> <td> </td> </tr> <tr> <td width = "250"> </td> <td> <input name = "add" type = "submit" id = "add" value = "Add Tutorial"> </td> </tr> </table> </form> <?php } ?> </body> </html>
进行数据插入时,最好使用函数 get_magic_quotes_gpc() 来检查是否设置了魔术引号的当前配置。如果此函数返回false,则使用函数addlashes()在引号之前添加斜杠。您可以进行许多验证来检查输入的数据是否正确,并可以采取适当的措施。