PHP连接MySQL数据库-外链论坛 - Powered by Discuz! Archiver

f9yx0du 发表于 2024-7-10 15:57:35

PHP连接MySQL数据库

<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic2.zhimg.com/80/v2-84968f9b1ed0800a484d8b9b8c81aead_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">一行简单的$conn = mysql_connect("localhost:3306","root","root");</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">就<span style="color: black;">能够</span>获取连接对象啦</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">比JAVA方便太多了</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic2.zhimg.com/80/v2-cfd29fb7bdf07aa1692894874ecc6085_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">mysql_select_db("phpdemo",$conn); <span style="color: black;">选取</span>数据库</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">$result = mysql_query("select * from user"); <span style="color: black;">查找</span>数据库返回一个result的标识</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">$result_arr = mysql_fetch_assoc($result); 把result中的数据提取出来,一次只提取一条记录</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic1.zhimg.com/80/v2-954b52a621f49dfb0e1321b4095e805c_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">循环打印<span style="color: black;">因此</span>的记录</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">下面是<span style="color: black;">插进</span>数据,<span style="color: black;">能够</span>看到做了很长的数据安全验证操作</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">重点:在sql语句中,传入参数的时候,参数<span style="color: black;">必定</span>要用引号<span style="color: black;">导致</span>来,防止sql注入,这个很<span style="color: black;">要紧</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">倘若</span>不<span style="color: black;">导致</span>来,就会被有心人写入sql语句,<span style="color: black;">倘若</span>引了起来,就会变成字符串.</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">倘若</span>是int类型的,请先吧数据转换成int格式,在<span style="color: black;">插进</span>到sql语句中.</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">运用</span>intval()函数</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-f4da9b22c1d11deebc89528496bc080e_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">connectDB(),是从dbconnect.php中定义的,返回的是连接对象.</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-c639583b6f130d2520beb5d2589125aa_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic1.zhimg.com/80/v2-bb6640a943cbf92a4e0182b5eb672138_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">上图是前端请求代码</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-c361a57ec6044fbc227b3c6000591f6e_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">上图是<span style="color: black;">运用</span>PDO对象连接MySQL数据库获取数据</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic4.zhimg.com/80/v2-a5d08fbd78fc0ca3ce983ed69eb717bb_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">能够</span>简化成上面的操作,直接在foreach中写sql执行语句</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-2d72d5374be5fe4f54f96f8f26c5ab72_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">完整的增删改查</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-4cf75e968d2eb70b45b0d4dc1c801e72_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-fe1dd07ccf1163f89555f2633f6f1142_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic2.zhimg.com/80/v2-7e748d5c12bffb84eb21cb6cd3fb1545_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic4.zhimg.com/80/v2-c66808e2b7c974d4d9d0c24928fe85c3_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-00096fea60be29b8617d5a1918504e02_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic1.zhimg.com/80/v2-8edb168ce8da2e5146ebcf55a24e1900_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic2.zhimg.com/80/v2-8f8779e67da5994e5399d41be0898709_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">利用while循环<span style="color: black;">查找</span>数据,直到最后一行$row等于null,<span style="color: black;">这般</span>循环就退出了</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-4fff955626081ab5b8f69741b56bdc7a_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>PDO的事务处理<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic1.zhimg.com/80/v2-5037bdfe6ba1dff8bb90764d119f8140_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">不<span style="color: black;">运用</span>try...catch,手动<span style="color: black;">办事</span>务处理,利用errorCode()<span style="color: black;">办法</span>,<span style="color: black;">倘若</span>有错,就要回滚</p>

情迷布拉格 发表于 2024-8-20 12:08:59

楼主果然英明！不得不赞美你一下！

bitheerani12500 发表于 2024-9-7 10:20:51

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qzmjef 发表于 2024-10-30 06:07:26

楼主节操掉了，还不快捡起来！

m5k1umn 发表于 4 天前

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PHP连接MySQL数据库