Mysql必读详解MySQL插入和查询数据的相关命令及语句使用
《Mysql必读详解MySQL插入和查询数据的相关命令及语句使用》要点: MYSQL教程插入数据 MYSQL教程
INSERT INTO table_name ( field1,field2,...fieldN )
VALUES
( value1,value2,...valueN );
MYSQL教程如果数据是字符型,必需使用单引号或者双引号,如:"value". MYSQL教程
root@host# mysql -u root -p password;
Enter password:*******
MYSQL教程
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,submission_date)
->VALUES
->("Learn MySQL","Abdul S",submission_date)
->VALUES
->("JAVA Tutorial","Sanjay",'2007-05-06');
Query OK,1 row affected (0.01 sec)
mysql>
MYSQL教程注意: 使用箭头标记(->)不是SQL语句的一部分,它仅仅表示一个新行,如果一条SQL语句太长,我们可以通过回车键来创建一个新行来编写SQL语句,SQL语句的命令结束符为分号(;). MYSQL教程
bool mysql_query( sql,connection );
MYSQL教程 MYSQL教程实例 MYSQL教程
<html>
<head>
<title>Add New Record in MySQL Database</title>
</head>
<body>
<?php
if(isset($_POST['add']))
{
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost,$dbuser,$dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
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'];
$sql = "INSERT INTO tutorials_tbl ".
"(tutorial_title,submission_date) ".
"VALUES ".
"('$tutorial_title','$tutorial_author','$submission_date')";
mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql,$conn );
if(! $retval )
{
die('Could not enter data: ' . mysql_error());
}
echo "Entered data successfullyn";
mysql_close($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>
MYSQL教程在我们接收用户提交的数据时,为了数据的平安性我们需要使用 get_magic_quotes_gpc() 函数来判断特殊字符的转义是否已经开启.如果这个选项为off(未开启),返回0,那么我们就必须调用addslashes 这个函数来为字符串增加转义. MYSQL教程查询数据 MYSQL教程
SELECT field1,...fieldN table_name1,table_name2...
[WHERE Clause]
[OFFSET M ][LIMIT N]
MYSQL教程查询语句中你可以使用一个或者多个表,表之间使用逗号(,)分割,并使用WHERE语句来设定查询条件. MYSQL教程
root@host# mysql -u root -p password;
Enter password:*******
MYSQL教程
mysql> use TUTORIALS;
Database changed
mysql> SELECT * from tutorials_tbl
+-------------+----------------+-----------------+-----------------+
| tutorial_id | tutorial_title | tutorial_author | submission_date |
+-------------+----------------+-----------------+-----------------+
| 1 | Learn PHP | John Poul | 2007-05-21 |
| 2 | Learn MySQL | Abdul S | 2007-05-21 |
| 3 | JAVA Tutorial | Sanjay | 2007-05-21 |
+-------------+----------------+-----------------+-----------------+
3 rows in set (0.01 sec)
mysql>
MYSQL教程使用PHP脚原来获取数据 MYSQL教程
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost,$dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$sql = 'SELECT tutorial_id,tutorial_title,submission_date
FROM tutorials_tbl';
mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql,$conn );
if(! $retval )
{
die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval,MYSQL_ASSOC))
{
echo "Tutorial ID :{$row['tutorial_id']} <br> ".
"Title: {$row['tutorial_title']} <br> ".
"Author: {$row['tutorial_author']} <br> ".
"Submission Date : {$row['submission_date']} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfullyn";
mysql_close($conn);
?>
MYSQL教程以上实例中,读取的每行记录赋值给变量$row,然后再打印出每个值. MYSQL教程
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost,$conn );
if(! $retval )
{
die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_assoc($retval))
{
echo "Tutorial ID :{$row['tutorial_id']} <br> ".
"Title: {$row['tutorial_title']} <br> ".
"Author: {$row['tutorial_author']} <br> ".
"Submission Date : {$row['submission_date']} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfullyn";
mysql_close($conn);
?>
MYSQL教程你也可以使用常量 MYSQL_NUM 作为PHP mysql_fetch_array()函数的第二个参数,返回数字数组. MYSQL教程
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost,MYSQL_NUM))
{
echo "Tutorial ID :{$row[0]} <br> ".
"Title: {$row[1]} <br> ".
"Author: {$row[2]} <br> ".
"Submission Date : {$row[3]} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfullyn";
mysql_close($conn);
?>
MYSQL教程以上三个实例输出结果都一样. MYSQL教程
<必修php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost,MYSQL_NUM))
{
echo "Tutorial ID :{$row[0]} <br> ".
"Title: {$row[1]} <br> ".
"Author: {$row[2]} <br> ".
"Submission Date : {$row[3]} <br> ".
"--------------------------------<br>";
}
mysql_free_result($retval);
echo "Fetched data successfullyn";
mysql_close($conn);
必修>
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