myaqli函數

 

數據庫db1中有標t1

mysqli_fetch_row:以索引數組的方式獲取一條記錄的數據

<?php
$dbhost = 'localhost';  // mysql服務器主機地址
$dbuser = 'root';            // mysql用戶名
$dbpass = 'root';          // mysql用戶名密碼
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
    die('Could not connect: ' . mysqli_error());
}
mysqli_select_db($conn, 'db1');
$query='select * from t1';
$result=mysqli_query($conn, $query);
var_dump(mysqli_fetch_row($result));// ['1','Jack','18']
var_dump(mysqli_fetch_row($result));// ['2','Tom','20']
var_dump(mysqli_fetch_row($result));// NULL
mysqli_close($conn);
?>

2. mysqli_fetch_assoc:以關聯數組的方式獲取一條記錄的數據

var_dump(mysqli_fetch_assoc($result));// {id:'1',name:'Jack',age:'18'}
var_dump(mysqli_fetch_assoc($result));// {id:'2',name:'Tom',age:'20'}
var_dump(mysqli_fetch_assoc($result));// NULL
//返回的數據,array?
array(3) {
  ["id"]=>
  string(1) "1"
  ["name"]=>
  string(4) "Jack"
  ["age"]=>
  string(2) "18"
}
array(3) {
  ["id"]=>
  string(1) "2"
  ["name"]=>
  string(3) "Tom"
  ["age"]=>
  string(2) "20"
}
NULL

mysqli_fetch_array：以索引數組或關聯數組的方式獲取一條記錄的數據，默認兩種心事都返回

mysqli_fetch_array($result);索引數組和關聯數組

mysqli_fetch_array($result,MYSQLI_ASSOC);// 關聯數組 

mysqli_fetch_array($result,MYSQLI_NUM);// 數字數組

var_dump(mysqli_fetch_array($result));
//結果

array(6) {
  [0]=>
  string(1) "1"
  ["id"]=>
  string(1) "1"
  [1]=>
  string(4) "Jack"
  ["name"]=>
  string(4) "Jack"
  [2]=>
  string(2) "18"
  ["age"]=>
  string(2) "18"
}

mysqli_fetch_all:以索引數組或關聯數組的方式獲取全部記錄的數據

mysqli_fetch_all($result)

mysqli_fetch_all($result,MYSQLI_ASSOC)

mysqli_fetch_all($result,MYSQLI_NUM)

var_dump(mysqli_fetch_all($result,MYSQLI_ASSOC));
//結果
array(2) {
  [0]=>
  array(3) {
    ["id"]=>
    string(1) "1"
    ["name"]=>
    string(4) "Jack"
    ["age"]=>
    string(2) "18"
  }
  [1]=>
  array(3) {
    ["id"]=>
    string(1) "2"
    ["name"]=>
    string(3) "Tom"
    ["age"]=>
    string(2) "20"
  }
}

int mysqli_num_rows ( mysqli_result $result ) ：獲取結果中行的數量

var_dump(mysqli_num_rows($result));//int(2)

mysqli_fetch_field:返回一個字段的信息

var_dump(mysqli_fetch_field($result));//id字段的信息
var_dump(mysqli_fetch_field($result));//name字段
var_dump(mysqli_fetch_field($result));age字段
var_dump(mysqli_fetch_field($result));false

mysqli_fetch_fields:返回所有字段的信息。