本文的主要讲述的是在PHP中调用MySQL数据库的基本操作代码以及解释，具有一定的参考价值，有需要的朋友一定要好好看看！

PHP-MySQL基本操作

 <?php// 1.防止页面中文乱码header("content-type:text/html;charset=utf-8");// 链接数据库@$conn = new mysqli('localhost', 'root', '');echo $conn == true ? '数据库连接成功' : '数据库连接失败';// 2.连接到MySQL后设置字符集(防止存入中文乱码)mysqli_set_charset($conn, 'utf8');// 创建数据库$createDatabaseSql = "create database ProsperLee01 charset utf8";// 删除数据库$dropDatabaseSql = "drop database ProsperLee01";// 查询数据库$showDatabaseSql = "show databases";// 查询创建的数据库信息$showCreateDatabaseSql = "show create database ProsperLee01";// 修改数据库（不能修改数据库的名字，只能修改字符集和校对集）语法：alter database 数据库 character set=新的字符集 collate=新的校对集$alterDatabaseSql1 = "alter database ProsperLee01 character set=gbk collate=gbk_Chinese_ci";$alterDatabaseSql2 = "alter database ProsperLee01 charset=utf8 collate=utf8_general_ci";// 查询字符集$showCharsetSql = "show charset";// 查询校对集$showCollationSql = "show collation";// 使用数据库$useDatabaseSql = "use ProsperLee01";// 创建数据表 语法 CREATE TABLE 库名 表名 (字段名 字段类型 字段选项, 字段名 字段类型 字段选项···) 表选项; （表选项：表字符集(charset=utf8)和数据引擎(engine=引擎)）$createTableSql =<<<sss    CREATE TABLE `prosperlee01`.`Lee01` (        `name` varchar(20) DEFAULT '小明同学' NOT NULL COMMENT '姓名',        `sex` varchar(5) NULL COMMENT '性别',        `age` int(2) NULL COMMENT '年龄',        `index` int NOT NULL AUTO_INCREMENT COMMENT '序号',        `id` varchar(8) NOT NULL COMMENT 'id',        PRIMARY KEY (`index`, `id`)    ) ENGINE=InnoDB DEFAULT CHARSET=utf8sss;// 查询数据表$showTablesSql = "show tables";// 查看数据表结构$descTableSql = "desc lee01";// 查询创建的数据表$showCreateTableSql = "show create table Lee01";// 修改表名 alter table 旧表名 rename [to] 新表名$alterTableNameSql = "alter table lee01 rename to newlee01";// 添加新字段$alterTableAddFieldSql = "alter table lee01 add realname varchar(50) not null default '用户名' comment '真实姓名'";// 删除字段 alter table 表名 drop column 字段名$alterTableDropFieldSql = "alter table lee01 drop column phone";// 修改表的字段类型   ALTER TABLE 表名 MODIFY COLUMN 字段名 字段类型定义;$alterTableModifyFieldSql = "ALTER TABLE lee01 MODIFY COLUMN id VARCHAR(32)";// 修改表的字段名(修改后原始字段存的值不会变，新存入的值不填写变成默认值) alter table 表名 change 原字段名  新字段名  字段的类型$alterTableChangeFieldSql = "ALTER TABLE lee01 change realname phone VARCHAR(11) default '01234567890' comment '电话号'";// 插入数据 INSERT INTO table_name (列1, 列2,...) VALUES (值1, 值2,....)$insertIntoDataSql1 = "INSERT INTO Lee01 (`sex`,`age`,`id`) VALUES ('女',20,'88888888')";$insertIntoDataSql2 = "INSERT INTO Lee01 (`name`,`sex`,`age`,`id`) VALUES ('Lee','女',20,'66666666')";$insertIntoDataSql = <<<sss    INSERT INTO Lee01 ( `name`, `sex`, `age`, `id` )    VALUES        ( '张三', '女', 16, '12345678' ),        ( '李四', '男', 18, '87654321' ),        ( '王五', '女', 20, '22222222' ),        ( '赵六', '女', 21, '11111111' ),        ( '八爷', '男', 26, '14725836' ),        ( '九少', '男', 16, '66666666' )sss;// 查询语句$selectDataSql1 = "select * from lee01";$selectDataSql2 = "select * from lee01 where sex = '女' and age = '20'";$selectDataSql3 = "select * from lee01 where age = '20' or age = '16'";$selectDataSql4 = "select * from lee01 where not age = '20'";$selectDataSql5 = "select name,age from lee01 where age = '20' or age = '16'";// in 查询指定index (无则跳过)$selectDataSql6 = "select name,age from lee01 where `index` in (1,2,4,6)";// between 语法：select 查询字段 from 表名 where 字段 between 最小值 and 最大值;$selectDataSql7 = "select name from lee01 where `index` between 2 and 5";// 查询数据量(启用别名)$selectDataSql8 = "select count(`index`) as count from lee01";// like 模糊查询（注：直接写字符，严格匹配）%匹配任何字符$selectDataSql9 = "select * from lee01 where name like '%三%'";// group by （只能查看分组后的数量，而不能查看分组后的信息）$selectDataSql10 = "select count(sex),sex from lee01 group by sex";// 查询性别数量大于2个的性别的数量$selectDataSql11 = "select count(sex) as sexnum,sex from lee01 group by sex having sexnum>2";// 查询正序(asc)倒序(desc)$selectDataSql12 = "select * from lee01 order by id asc";// 分页查询 （limit 下标,查询数量）$selectDataSql13 = "select * from lee01 order by `index` asc limit 0,2";$selectDataSql14 = "select * from lee01 order by `index` asc limit 2,2";$selectDataSql15 = "select * from lee01 order by `index` asc limit 4,2";// 删除数据表$dropTableSql = "drop table lee01";// 清空数据表(同时删除自增字段的定义)$truncateTableSql1 = "truncate table lee01";// 清空数据表（删除表中的所有行，一行一行的删）（delete 保留原有自增字段，再次创建不占用删除字段）$deleteTableSql1 = "delete from lee01";// 按条件删除 delete from 表名 [where条件] [order排序] [limit限定]（删除范围数据可能会用到order、limit）$deleteTableSql2 = "delete from lee01 where phone = '用户名'";// 修改数据(无条件全改)$updateSetSql = "update lee01 set name = 'ProsperLee',age=23 where id = '87654321'";// 使用数据库mysqli_select_db($conn, 'ProsperLee01'); // 使用数据库// 3.设置通信编码mysqli_query($conn, "set names utf8");// 执行sql语句$result = mysqli_query($conn, $selectDataSql1);var_dump($result);/** * fetch_assoc() 每次拿1条数据 * fetch_all() 拿出全部数据 */$showData = $result->fetch_all();var_dump($showData);// 关闭数据库mysqli_close($conn);

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