1.php连接数据库与基本操作配置
(1)php创建数据库【连接】（相关mysql视频教程推荐：《mysql教程》）
语法：Object mysqli_connect("域名","DB账号","DB密码","DB库名")
例子：$con = mysqli_connect('localhost','root','','frankdb');(2)向DB中插入数据时包含中文出现乱码的解决方案
语法：
mysqli_query($con,"set names utf8");
说明：设置成功会返回1，根据实际情况并不一定必须保存返回结果。
(3)设置client端和server端保持字符编码一致
语法：
mysqli_query($con,"set character_set_client=utf8");
mysqli_query($con,"set character_set_results=utf8"); (4)执行sql语句
语法：$结果 = $DB连接->query(sql语句); 例子：var_dump($result = $con->query($sql));
2.使用sql语句基本【模板】
a.建立连接
b.判断是否连接
c.设置编码
d.创建sql语句
e执行结果条数
g.拼凑结果
h.json化返回
';
echo'数据库连接成功，等待指令...';
mysqli_query($con,'set names utf8');
mysqli_query($con,'set character_set_client=utf8');
mysqli_query($con,'set character_set_results=utf8');
$sql="select * from stud where 1";
$result=$con->query($sql);
if($result>num_rows>0){
$info=[];
for($i=0;$row=$result->fet_assoc();$i++){
$info[$i]=$row;
}
echo json_encode($info);
}
}else{
echo'';
echo'数据连接失败，请重新连接‘；
} b.插入语句（添加语句）
两种写法：
(1)$sql="insert into 表名（字段1，字段2，...) values(值1，值2，...)";
(2)$sql='insert into 表名（'值1’,'值2',...)";
$con=mysqli_connect('localhost','root','','studb');
if($icon){
echo'';
echo'数据库连接成功，等待指令...';
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_result=utf8');
$sql="insert into stud stuName,stuGender,stuAge,stuNum,stuScore)values('lucy','female','14','123456789','90')";
$sql="insert into stud values('lucy','female','14','123456789','90')";
$result=$con->query($sql);
if($result){
echo'添加成功';
}else｛
echo'添加失败';
} c.修改语句（更新语句）update
$sql="update 表名 set 字段1=‘新值1’，字段2=‘新值2’，... where 条件“；
$con=mysqli_connect('localhost','root','','studb');
if($con){
echo "";
echo "数据库连接成功，等待指令...";
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
$sql="update stud set stuScore='100' where stuName='lily'";
$result=$con->query($sql);
var_dump($result);
}else{
echo "数据库连接失败！！！";
} d. 删除语句delete
$sql="delete from 表名 where 条件“；
$con=mysqli_connect('localhost','toot','';'studb' );
if($con){
echo "";
echo "数据库连接成功，等待指令...";
//
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
//
$sql = "delete from stud where stuName='lucy'";
$result = $con->query($sql);
var_dump($result);
}else{
echo "数据库连接失败！！！";
}
?>
ajax & php
Document
姓名：
性别：
年龄：
手机：
分数：
ajax select&php
Document
姓名：
性别：
年龄：
手机：
分数：
'success');
$error = array('status' => 'error');
$con = mysqli_connect('localhost','root','','studb');
if($con){
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
$sql = "select * from gradeonesheet where 1";
$result = $con->query($sql);
if($result->num_rows>0){
$info = [];
for($i=0; $row=$result->fetch_assoc(); $i++){
$info[$i] = $row;
}
//
echo json_encode($info);
}
}
?>
'OK');
$error = array('status' => 'error');
$con = mysqli_connect('localhost','root','','studb');
if($con){
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
//
$stuName = $_POST['stuName'];
$stuGender = $_POST['stuGender'];
$stuAge = $_POST['stuAge'];
$stuNumber = $_POST['stuNumber'];
$stuScore = $_POST['stuScore'];
$sql = "insert into gradeonesheet values('$stuName','$stuGender','$stuAge','$stuNumber','$stuScore')";
$result = $con->query($sql);
if($result){
$success['msg'] = 'add success';
echo json_encode($success);
}else{
$error['msg'] = 'add failed';
echo json_encode($error);
}
}else{
$error['msg'] = 'database connect failed';
echo json_encode($error);
}
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