在mysql中，LIMIT子句与select语句一起使用，以限制结果集中的行数。LIMIT子句接受一个或两个offset和count的参数。这两个参数的值都可以是零或正整数。
offset:用于指定要返回的第一行的偏移量。
Count:用于指定要返回的最大行数。
Limit子句接受一个或两个参数，当指定两个参数时，第一个参数是偏移量，第二个参数表示计数，而当只指定一个参数时，它表示从结果集开始返回的行数。
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LIMIT语法：
SELECT column1, column2, ... FROM table_name LIMIT offset, count;
如下表“Data”，其中包含三列“Firstname”、“Lastname”和“Age”。
要从“Data”表中检索前三行，我们将使用以下查询:
SELECT * FROM Data LIMIT 3;
要从“Data”表中检索第2-3行(包括)，我们将使用以下查询:
SELECT * FROM Data LIMIT 1, 2;
示例1：Limit条件
<?php $link = mysqli_connect("localhost", "root", "", "Mydb"); if ($link == = false) { die("ERROR: Could not connect. ".mysqli_connect_error()); } $sql = "SELECT * FROM Data LIMIT 2"; if ($res = mysqli_query($link, $sql)) { if (mysqli_num_rows($res) > 0) { echo "
“; echo “
“; echo “
“; echo “
“; while ($row = mysqli_fetch_array($res)) { echo “
“; echo ““; echo “
“; echo “
“; echo “
“; } echo “
| Firstname | Lastname | Age |
|---|---|---|
| “.$row[‘Firstname’].” | “.$row[‘Lastname’].” | “.$row[‘Age’].” |
“; mysqli_free_result($res); } else { echo “No matching records are found.”; } } else { echo “ERROR: Could not able to execute $sql. “.mysqli_error($link); } mysqli_close($link);
输出：
注：“res”变量存储函数mysql_query()返回的数据。
每次调用mysqli_fetch_array()时，它都会从res()集中返回下一行。
while循环用于遍历表“data”的所有行。
示例2：使用面向对象方法的Limit子句
<?php $mysqli = new mysqli("localhost", "root", "", "Mydb"); if ($mysqli == = false) { die("ERROR: Could not connect. ".$mysqli->connect_error); } $sql = "SELECT * FROM Data LIMIT 2"; if ($res = $mysqli->query($sql)) { if ($res->num_rows > 0) { echo "
“; echo “
“; echo “
“; echo “
“; while ($row = $res->fetch_array()) { echo “
“; echo ““; echo “
“; echo “
“; echo “
“; } echo “
| Firstname | Lastname | Age |
|---|---|---|
| “.$row[‘Firstname’].” | “.$row[‘Lastname’].” | “.$row[‘Age’].” |
“; $res->free(); } else { echo “No matching records are found.”; } } else { echo “ERROR: Could not able to execute $sql. “.$mysqli->error; } $mysqli->close();
输出：
示例3：使用pdo方法的Limit子句
<?php try { $pdo = new PDO("mysql:host=localhost;dbname=Mydb", "root", ""); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { die("ERROR: Could not connect. ".$e->getMessage()); } try { $sql = "SELECT * FROM Data LIMIT 2"; $res = $pdo->query($sql); if ($res->rowCount() > 0) { echo "
“; echo “
“; echo “
“; echo “
“; while ($row = $res->fetch()) { echo “
“; echo ““; echo “
“; echo “
“; echo “
“; } echo “
| Firstname | Lastname | Age |
|---|---|---|
| “.$row[‘Firstname’].” | “.$row[‘Lastname’].” | “.$row[‘Age’].” |
“; unset($res); } else { echo “No matching records are found.”; } } catch (PDOException $e) { die(“ERROR: Could not able to execute $sql. “.$e->getMessage()); } unset($pdo);
输出：
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