如何将 MySQL 查询转换为 PHP 代码

Posted 2023-02-24

【中文标题】如何将 MySQL 查询转换为 PHP 代码

【英文标题】：How to convert MySQL query to PHP code

【发布时间】：2017-10-18 04:00:32

【问题描述】：

我正在尝试使用 Codeigniter 作为框架从数据库中获取数据。

我能够提出所需结果的 SQL 查询，但由于我不熟悉 Codeigniter DB 语法，所以我遇到了麻烦。下面是我要执行的查询。我如何在 php 中执行此操作？

任何意见或建议将不胜感激。谢谢。

SELECT A.*, B.*
FROM
    (SELECT A.*
    FROM DriversInfo as A, InvoiceQueue as B
    WHERE A.CreateTime = B.DriverCreateTime
    AND B.Error <> 1
    GROUP BY A.CreateTime
    UNION
    SELECT DISTINCT A.*
    FROM DriversInfo as A, OrderInfo as B
    WHERE A.CreateTime = B.DriverKey
    AND B.Invoice <> '0') as A
LEFT JOIN DriversDoc as B
on A.CreateTime = B.DriverCreateTime
WHERE B.DriversLicense is null
OR B.CarRegistration is null
OR B.BizCertificate is null
OR B.Insurance is null;

【问题讨论】：

如果在phpmyadmin中，那么你可以在那里创建。

在codeigniter中获取查询结果：$query = $this->db->query("YOUR QUERY")->result_array();

【参考方案1】：

试试这个：

$query=$this->db->query("SELECT A.*, B.* FROM (SELECT A.* FROM DriversInfo as A, InvoiceQueue as B WHERE A.CreateTime = B.DriverCreateTime AND B.Error <> 1 GROUP BY A.CreateTime UNION  SELECT DISTINCT A.* FROM DriversInfo as A, OrderInfo as B  WHERE A.CreateTime = B.DriverKey  AND B.Invoice <> '0') as A LEFT JOIN DriversDoc as B on A.CreateTime = B.DriverCreateTime WHERE B.DriversLicense is null OR B.CarRegistration is null OR B.BizCertificate is null OR B.Insurance is null;"); 

【参考方案2】：

$qry = "SELECT A.*, B.*
    FROM
    (SELECT A.*
    FROM DriversInfo as A, InvoiceQueue as B
    WHERE A.CreateTime = B.DriverCreateTime
    AND B.Error <> 1
    GROUP BY A.CreateTime
    UNION
    SELECT DISTINCT A.*
    FROM DriversInfo as A, OrderInfo as B
    WHERE A.CreateTime = B.DriverKey
    AND B.Invoice <> '0') as A
    LEFT JOIN DriversDoc as B
    on A.CreateTime = B.DriverCreateTime
    WHERE B.DriversLicense is null
    OR B.CarRegistration is null
    OR B.BizCertificate is null
    OR B.Insurance is null;";

$query = $this->db->query($qry);

$result = $query->result_array();

【参考方案3】：

 <?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) 
    die("Connection failed: " . $conn->connect_error);


$sql = "SELECT A.*, B.*
FROM
    (SELECT A.*
    FROM DriversInfo as A, InvoiceQueue as B
    WHERE A.CreateTime = B.DriverCreateTime
    AND B.Error <> 1
    GROUP BY A.CreateTime
    UNION
    SELECT DISTINCT A.*
    FROM DriversInfo as A, OrderInfo as B
    WHERE A.CreateTime = B.DriverKey
    AND B.Invoice <> '0') as A
LEFT JOIN DriversDoc as B
on A.CreateTime = B.DriverCreateTime
WHERE B.DriversLicense is null
OR B.CarRegistration is null
OR B.BizCertificate is null
OR B.Insurance is null";
$result = $conn->query($sql);

if ($result->num_rows > 0) 
    // output data of each row
    while($row = $result->fetch_assoc()) 
        //displaying row
    
 else 
    echo "0 results";

$conn->close();
?> 

【参考方案4】：

您只需使用带有连接变量的mysqli_query() 函数。

<?php

    $sql = "YOUR QUERY";
    $result = mysqli_query($conn, $sql); 

    if (mysqli_num_rows($result) > 0) 
        // output data of each row
        while($row = mysqli_fetch_assoc($result)) 
            //Access like $row["id"]
        
     else 
        echo "0 results";
    

    mysqli_close($conn);
    ?>

【参考方案5】：

如果你想以 codeigniter 方式运行这个查询，那么试试这个

$this->db->select('A.*, B.*')
$this->db->from('(SELECT A.*
    FROM DriversInfo as A, InvoiceQueue as B
    WHERE A.CreateTime = B.DriverCreateTime
    AND B.Error <> 1
    GROUP BY A.CreateTime
    UNION
    SELECT DISTINCT A.* 
    FROM DriversInfo as A, OrderInfo as B WHERE A.CreateTime = B.DriverKey AND B.Invoice <> '0') as A')

$this->db->join('DriversDoc', 'A.CreateTime = B.DriverCreateTime ', 'left');
$this->db->where('B.DriversLicense', null);
$this->db->or_where('B.CarRegistration', null);
$this->db->or_where('B.BizCertificate', null);
$this->db->or_where('B.Insurance', null);
$this->db->get();

你也可以这样试试。

        $query = $this->db->query('SELECT A.*, B.*
FROM
    (SELECT A.*
    FROM DriversInfo as A, InvoiceQueue as B
    WHERE A.CreateTime = B.DriverCreateTime
    AND B.Error <> 1
    GROUP BY A.CreateTime
    UNION
    SELECT DISTINCT A.*
    FROM DriversInfo as A, OrderInfo as B
    WHERE A.CreateTime = B.DriverKey
    AND B.Invoice <> '0') as A
LEFT JOIN DriversDoc as B
on A.CreateTime = B.DriverCreateTime
WHERE B.DriversLicense is null
OR B.CarRegistration is null
OR B.BizCertificate is null
OR B.Insurance is null;');
        echo print_r($query->result());

更多信息您可以在这里查看 https://www.codeigniter.com/userguide3/database/query_builder.html

【参考方案6】：

我从 2013 年开始使用 CI。下面是在 CodeIgniter 中使用数据库的基本结构。不支持子查询和UNION，因此您需要在两个数据库中执行SELECT，然后执行$query = $this->db->query($query1." UNION ".$query2);，或者使用联合编写您自己的子句。

$this->db->select('*');
$this->db->from('table1');
$this->db->join('table2', 'table2.id = table1.id'); //same as JOIN table2 ON table2.id = table1.id
$this->db->join('table2', 'table2.id = table1.id', 'left'); //produces a LEFT JOIN table2 ON table2.id = table1.id
$this->db->where('column1', 'data');  //same as WHERE column1 = 'data'
$this->db->where("colum1 = 'data' OR column2 = 'data2'"); // you can write you own clause
$this->db->like('title', 'match'); //same as WHERE title LIKE '%match%'
$this->db->like('title', 'match', 'before'); //same as WHERE title LIKE '%match'
$this->db->like('title', 'match', 'after'); //same as WHERE title LIKE 'match%'
$this->db->like('title', 'match', 'both'); //same as WHERE title LIKE '%match%'
$this->db->group_by("title"); 
$this->db->order_by('title', 'ASC');


$query = $this->db->get();

欲了解更多信息：https://www.codeigniter.com/userguide3/database/query_builder.html