Home Database Mysql Tutorial 结合PHP脚本添加和查询MySQL数据的基本教程_MySQL

结合PHP脚本添加和查询MySQL数据的基本教程_MySQL

May 27, 2016 pm 01:46 PM
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MySQL Insert Into 添加数据
INSERT INTO
INSERT INTO 语法用于向数据表中添加数据记录。
语法:

INSERT INTO tb_name VALUES (value1, value2,...)
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该语法表示向表中所有的字段按顺序都插入数据记录。
但更多情况下是向指定的列添加记录:

INSERT INTO tb_name (column1, column2,...) VALUES (value1, value2,...)
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下面的例子向 user 表添加一条记录:

<&#63;php
$conn = @mysql_connect("localhost","root","root123");
if (!$conn){
  die("连接数据库失败:" . mysql_error());
}

mysql_select_db("test", $conn);
mysql_query("set names 'gbk'"); //为避免中文乱码做入库编码转换
//mysql_query("set names 'utf8'"); //PHP 文件为 utf-8 格式时使用
$password = md5("123456"); //原始密码 12345 经过加密后得到加密后密码
$regdate = time();  //得到时间戳
$sql = "INSERT INTO user(username, password, email, regdate)VALUES('小王', '$password',
 '12345@163.com', $regdate)";
//exit($sql);             //退出程序并打印 SQL 语句,用于调试

if(!mysql_query($sql,$conn)){
  echo "添加数据失败:".mysql_error();
} else {
  echo "添加数据成功!";
}
&#63;>

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如果是表单提交的数据,那么在数据处理页面可以使用 $_POST 或 $_GET 接收表单数据而将数据写入数据表。
说明
1.为了避免数据记录因为编码问题无法写入数据表或写入乱码,所以在执行 mysql_query() 之前,进行了编码转换
2.存储密码为实际密码经过 MD5 加密,MD5 加密不可逆,如要验证密码,只需将用户输入的密码经 MD5 加密后与数据库密码比对即可
3.在 SQL 语句中,我们使用单引号''来表示文本字符属性
4.为了调试数据写入数据表中出现的异常,增加了退出程序并打印 SQL 语句的功能,在需要调试的时候可去掉语句前面的注释,使之生效而便于调试

MySQL Select from 查询数据
普通查询
SELECT FROM 语法用于从数据表中查询读取数据。
语法:

SELECT column1,column1,... FROM tb_name
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如果要读取全部字段,可以使用 * 号代替字段名:

SELECT * FROM tb_name
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例子:

<&#63;php
$conn = @mysql_connect("localhost","root","root123");
if (!$conn){
  die("连接数据库失败:" . mysql_error());
}

mysql_select_db("test", $conn);
mysql_query("set character set 'gbk'");  //避免中文乱码字符转换
mysql_query("set character set 'utf8'");  // PHP 文件为 utf-8 格式时使用
$sql = "SELECT * FROM user";
$result = mysql_query($sql);        //得到查询结果数据集

//循环从数据集取出数据
while( $row = mysql_fetch_array($result) ){
  echo "用户名:".$row['username']."<br />";
  echo "电子邮件:".$row['email']."<br />";
  echo "注册日期:".date("Y-m-d", $row[regdate])."<br /><br />";
}
&#63;>

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浏览器输出:
用户名:admin
电子邮件:admin@5idev.com
注册日期:2010-08-06

用户名:小明
电子邮件:xiao@163.com
注册日期:2010-07-02

用户名:Jack
电子邮件:jack@gmail.com
注册日期:2010-07-02

用户名:小王
电子邮件:12345@163.com
注册日期:2010-11-13
说明
1.使用 mysql_query("set character set 'gbk'") 来避免读取数据的中文乱码
2.mysql_query() 得到的是数据集资源(Resource),需要用 mysql_fetch_array() 函数来取得
3.使用 while 循环来逐行取得全部数据

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