How to obtain record data from MySQL database in PHP

Get the total number of records in the data table

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select count(*) from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result = $mysqli->query($sql);//以索引的方式返回一个结果集
list($rowCount)=$result->fetch_row();
echo &#39;记录总数：&#39;.$rowCount;
$result->close();
$mysqli->close();
?>

It can also be obtained like this:

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select count(*) from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result = $mysqli->query($sql);//以索引的方式返回一个结果集
$row = $result->fetch_row();
echo &#39;记录总数：&#39;.$row[0];
$result->close();
$mysqli->close();
?>

Other forms: ($row['total'] replaced by $ row[0] can also be used)

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select count(*) as total from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result = $mysqli->query($sql);//以索引的方式返回一个结果集
$row = $result->fetch_array(MYSQLI_BOTH);
echo &#39;记录总数：&#39;.$row[&#39;total&#39;];
$result->close();
$mysqli->close();
?>

I checked the PHP operation manual and found that there are too many similar functions, which means that PHP has many processing methods for the same needs.

Get the records of the database query table and return it in JSON format

<?php
$sql = "select * from druserlist";//查询语句
$res = $mysqli->query($sql);//执行查询
$result = array();//准备一个空数组
while ($row = $res->fetch_assoc()){
    //对结果集进行逐行取值并压入到数组中
    array_push($result,$row);
}
echo json_encode($result);//返回前端JSON格式数据
?>

Returned data:

[
  {
    "C01": "00924001",
    "C02": "经理办01",
    "C03": "1",
    "C04": "普通用户",
    "C05": "1"
  },
  {
    "C01": "00924002",
    "C02": "经理办02",
    "C03": "2",
    "C04": "普通用户",
    "C05": "1"
  },
  {
    "C01": "00923128",
    "C02": "人事科01",
    "C03": "1",
    "C04": "普通用户",
    "C05": "人事科的张小勇"
  }
]

Get the paging record data of the data table and return it in JSON format (Take LayUI's paging data as an example)

<?php
$page  = isset($_POST[&#39;page&#39;]) ? intval($_POST[&#39;page&#39;]) : 1;//获取页数
$limit = isset($_POST[&#39;limit&#39;]) ? intval($_POST[&#39;limit&#39;]) : 10;//获取每页的显示记录数
$offset = ($page-1)*$limit;//计算起始位置
 
require &#39;linkConfig.php&#39;;//连接数据库
$sql1 = "select count(*) from druserlist";
$result1 = $mysqli->query($sql1);
$rowCount = $result1->fetch_row();
 
$returnArr[&#39;code&#39;]=0;
$returnArr[&#39;msg&#39;]="";
$returnArr[&#39;count&#39;]=$rowCount[0];//总记录数
 
$sql2 = "select * from druserlist order by C01 limit $offset,$limit";
$res = $mysqli->query($sql2);
$result = array();
while ($row = $res->fetch_assoc()){
    array_push($result,$row);
}
$returnArr[&#39;data&#39;]=$result;
echo json_encode($returnArr);//返回JSON格式数据
$res->free();
$mysqli->close();
?>

Returned data:

{
  "code": 0,
  "msg": "",
  "count": "12",
  "data": [
    {
      "C01": "00101078",
      "C02": "HaoR",
      "C03": "2",
      "C04": "管理员",
      "C05": "1"
    },
    {
      "C01": "00323007",
      "C02": "研究中心01",
      "C03": "1",
      "C04": "管理员",
      "C05": "1"
    },
    {
      "C01": "00616001",
      "C02": "财务科01",
      "C03": "1",
      "C04": "管理员",
      "C05": "1"
    },
    {
      "C01": "00616002",
      "C02": "财务科02",
      "C03": "1",
      "C04": "管理员",
      "C05": "1"
    },
    {
      "C01": "00616003",
      "C02": "财务科03",
      "C03": "1",
      "C04": "管理员",
      "C05": "1"
    },
    {
      "C01": "00923127",
      "C02": "admin",
      "C03": "1",
      "C04": "管理员",
      "C05": "系统管理员"
    },
    {
      "C01": "00923128",
      "C02": "人事科01",
      "C03": "1",
      "C04": "普通用户",
      "C05": "人事科的张小勇"
    },
    {
      "C01": "00923129",
      "C02": "人事科02",
      "C03": "1",
      "C04": "管理员",
      "C05": "1"
    }
  ]
}

can return different data styles according to the front-end paging requirements. Once you know the PHP processing, it will be easier to handle. .

PHP’s processing of mysql database query result set.

⑴　fetch_array()

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
while($row = $result->fetch_array()){
    $rows[] = $row;
}
foreach($rows as $row){
    echo $row[&#39;C01&#39;].&#39;  &#39;.$row[&#39;C02&#39;].&#39;<br>&#39;;
}
$result->close();
$mysqli->close();
?>

Results returned line by line:

00924001 Manager Office 01
00924002 Manager Office 02
00923128 Personnel Department 01

Return JSON format:

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
while($row = $result->fetch_array()){
    $rows[] = $row;
}
echo json_encode($rows);//返回JSON格式数据
$result->close();
$mysqli->close();
?>

Returned results:

[
  {
    "0": "00924001",
    "1": "经理办01",
    "C01": "00924001",
    "C02": "经理办01"
  },
  {
    "0": "00924002",
    "1": "经理办02",
    "C01": "00924002",
    "C02": "经理办02"
  },
  {
    "0": "00923128",
    "1": "人事科01",
    "C01": "00923128",
    "C02": "人事科01"
  }
]

It can be seen from the above output that the output is in the form of numbers and field names. According to the PHP operation manual, you can get the record value by giving the parameters of the fetch_array() function, that is, the following three outputs are the same.

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
//第一种输出
while($row = mysqli_fetch_array($result, MYSQLI_NUM)){
    echo $row[0].&#39;  &#39;.$row[1].&#39;<br>&#39;;
}
//第二种输出
while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
    echo $row[&#39;C01&#39;].&#39;  &#39;.$row[&#39;C02&#39;].&#39;<br>&#39;;
}
//第三种输出
while($row = mysqli_fetch_array($result, MYSQLI_BOTH)){
    echo $row[0].&#39;  &#39;.$row[&#39;C02&#39;].&#39;<br>&#39;;
}
$result->close();
$mysqli->close();
?>

The three outputs are the following results:

00924001 Manager Office 01
00924002 Manager Office 02
00923128 Personnel Department 01

⑵ fetch_row()

The above output can be performed using the following method:

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
while ($row = $result->fetch_row()) {
    printf ("%s %s <br>", $row[0], $row[1]);
}
$result->close();
$mysqli->close();
?>

⑶fetch_assoc()

The above output can be performed using the following method ：

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
while ($row = $result->fetch_assoc()) {
    printf ("%s %s <br>", $row["C01"], $row["C02"]);
}
$result->close();
$mysqli->close();
?>

⑷　fetch_all()

Similar to fetch_array, there are parameter selections, namely: MYSQLI_ASSOC, MYSQLI_NUM or MYSQLI_BOTH. The default is MYSQLI_BOTH.

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
$rows=$result->fetch_all(MYSQLI_NUM);
$r=0;
while ( $r < mysqli_num_rows($result) ) {
    printf ("%s %s <br>", $rows[$r][0], $rows[$r][1]);
    $r++;
}
$result->close();
$mysqli->close();
?>

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
$rows=$result->fetch_all(MYSQLI_ASSOC);
$r=0;
while ( $r < mysqli_num_rows($result) ) {
    printf ("%s %s <br>", $rows[$r][&#39;C01&#39;], $rows[$r][&#39;C02&#39;]);
    $r++;
}
$result->close();
$mysqli->close();
?>

<?php
require &#39;linkConfig.php&#39;;//根据连接信息连接数据库
$sql = "select C01,C02 from druserlist where C04=&#39;普通用户&#39;";//查询数据表
$result=$mysqli->query($sql);//以索引的方式返回一个结果集
$rows=$result->fetch_all(MYSQLI_BOTH);
$r=0;
while ( $r < mysqli_num_rows($result) ) {
    printf ("%s %s <br>", $rows[$r][0], $rows[$r][&#39;C02&#39;]);
    $r++;
}
$result->close();
$mysqli->close();
?>

The output of the above three pieces of code is the same.

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