如何将MySQL查询转换为PHP代码

我试图使用Codeigniter作为框架从数据库中获取数据

我能够为期望的结果提出SQL查询，但由于我不熟悉Codeigniter DB语法，所以遇到了一个问题。下面是我要执行的查询。如何在php中实现这一点

如有任何意见或建议，将不胜感激。多谢各位

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;

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;"); 

您只需使用带有连接变量的mysqli_查询函数

<?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);
    ?>

---

如果你想以codeigniter的方式运行这个查询，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();

你也可以这样尝试

        $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());

有关更多信息，请查看此处

---

自2013年以来，我一直在与CI合作。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。工会2美元；或者使用union编写自己的子句

$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();

---

有关更多信息：

如果在phpmyadmin中，则可以在那里创建。要在codeigniter中获取查询结果，请执行以下操作：$query=$this->db->queryYOUR query->result\u array；

        $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());

$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();