PHP操作数据库

error_reporting(0); $dbhost = 'localhost';  // mysql服务器主机地址 $dbuser = 'root';            // mysql用户名 $dbpass = '123456';          // mysql用户名密码 $conn = mysqli_connect($dbhost, $dbuser, $dbpass); if(! $conn ) {     die('数据库连接失败'); } echo '数据库连接成功';

创建数据库（推荐学习：《mysql视频教程》）

$sql = 'CREATE DATABASE RUNOOB'; $retval = mysqli_query($conn,$sql ); if(! $retval ) {     die('数据库创建失败'); } echo "数据库创建成功";

删除数据库

$sql = 'DROP DATABASE RUNOOB'; $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('数据库删除失败'); } echo "数据库删除成功";

选择数据库

mysqli_select_db($conn, 'RUNOOB' );

数据类型

数值、日期/时间、字符串

数值类型 tinyint smallint medium int/integer bigint float double decimal 日期/时间 date time datetime timestamp 字符串 char varchar tinyblob tinytext blob text mediumblob mediumtext longblob longtext

创建数据表

$sql = "CREATE TABLE runoob_tbl( ".         "runoob_id INT NOT NULL AUTO_INCREMENT, ".         "runoob_title VARCHAR(100) NOT NULL, ".         "runoob_author VARCHAR(40) NOT NULL, ".         "submission_date DATE, ".         "PRIMARY KEY ( runoob_id ))ENGINE=InnoDB DEFAULT CHARSET=utf8; "; mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('创建数据表失败'); } echo "创建数据表成功";

删除数据表

$sql = "DROP TABLE runoob_tbl"; mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {   die('删除数据表失败'); } echo "删除数据表成功";

插入数据

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   $runoob_title = '学习 Python'; $runoob_author = 'RUNOOB.COM'; $submission_date = '2016-03-06';   $sql = "INSERT INTO runoob_tbl ".         "(runoob_title,runoob_author, submission_date) ".         "VALUES ".         "('$runoob_title','$runoob_author','$submission_date')";       mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {   die('插入数据失败'); } echo "数据插入成功";

查询数据

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   $sql = 'SELECT runoob_id, runoob_title,          runoob_author, submission_date         FROM runoob_tbl';   mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('无法读取数据'); } echo '<h2>菜鸟教程 mysqli_fetch_array 测试<h2>'; echo '<table border="1"><tr><td>教程 ID</td><td>标题</td><td>作者</td><td>提交日期</td></tr>'; while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {     echo "<tr><td> {$row['runoob_id']}</td> ".          "<td>{$row['runoob_title']} </td> ".          "<td>{$row['runoob_author']} </td> ".          "<td>{$row['submission_date']} </td> ".          "</tr>"; } echo '</table>';

WHERE

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   // 读取 runoob_author 为 RUNOOB.COM 的数据 $sql = 'SELECT runoob_id, runoob_title,          runoob_author, submission_date         FROM runoob_tbl         WHERE runoob_author="RUNOOB.COM"';   mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('无法读取数据: ' . mysqli_error($conn)); } echo '<h2>菜鸟教程 MySQL WHERE 子句测试<h2>'; echo '<table border="1"><tr><td>教程 ID</td><td>标题</td><td>作者</td><td>提交日期</td></tr>'; while($row = mysqli_fetch_array($retval, MYSQL_ASSOC)) {     echo "<tr><td> {$row['runoob_id']}</td> ".          "<td>{$row['runoob_title']} </td> ".          "<td>{$row['runoob_author']} </td> ".          "<td>{$row['submission_date']} </td> ".          "</tr>"; } echo '</table>'; // 释放内存 mysqli_free_result($retval);

UPDATE

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   $sql = 'UPDATE runoob_tbl         SET runoob_title="学习 Python"         WHERE runoob_id=3';   mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('无法更新数据: ' . mysqli_error($conn)); } echo '数据更新成功！';

DELETE

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   $sql = 'DELETE FROM runoob_tbl         WHERE runoob_id=3';   mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('无法删除数据: ' . mysqli_error($conn)); } echo '数据删除成功！';

LINK

// 设置编码，防止中文乱码 mysqli_query($conn , "set names utf8");   $sql = 'SELECT runoob_id, runoob_title,          runoob_author, submission_date         FROM runoob_tbl         WHERE runoob_author LIKE "%COM"';   mysqli_select_db( $conn, 'RUNOOB' ); $retval = mysqli_query( $conn, $sql ); if(! $retval ) {     die('无法读取数据: ' . mysqli_error($conn)); } echo '<h2>菜鸟教程 mysqli_fetch_array 测试<h2>'; echo '<table border="1"><tr><td>教程 ID</td><td>标题</td><td>作者</td><td>提交日期</td></tr>'; while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {     echo "<tr><td> {$row['runoob_id']}</td> ".          "<td>{$row['runoob_title']} </td> ".          "<td>{$row['runoob_author']} </td> ".          "<td>{$row['submission_date']} </td> ".          "</tr>"; } echo '</table>';

排序

$sql = 'SELECT runoob_id, runoob_title,          runoob_author, submission_date         FROM runoob_tbl         ORDER BY  submission_date ASC(DESC)'; 升序(降序) 默认升序

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