php - 如何在php中动态添加多个WHERE子句

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我有五个输入字段，即技能、位置、公司、经验和薪水。根据用户需求，我将从数据库中获取值。我的问题是，如何动态地使用where条件？考虑到用户在skill和company输入字段中输入值，我想从数据库中获取这些值怎么做？现在我有20个条件来解决这个问题

public function get_jobonline($skillname,$userid,$location)
{
    $company=$this->input->post('searchcompany');
    $experience=$this->input->post('experience');
    $salary=$this->input->post('salary');
    echo $company;
    if($location==NULL)
    {
        $query=$this->db->query("SELECT j.id AS job_id, j.created_date,j.title, l.city AS location, cm.name AS company_name,
        cm.logo FROM  `jobs` AS j
        LEFT JOIN  `keyword` AS k ON  `k`.`job_id` =  `j`.`id`
        LEFT JOIN  `keyword_master` AS km ON  `km`.`id` =  `k`.`keyword_id`
        LEFT JOIN  `location_master` AS l ON  `l`.`id` =  `j`.`location`
        LEFT JOIN  `company_master` AS cm ON  `cm`.`id` =  `j`.`company_id`
        WHERE km.name = '$skillname' AND j.uid='$userid'
        ;");
    }
    else
    {
        $query=$this->db->query("SELECT j.id AS job_id, j.created_date,j.title, l.city AS location, cm.name AS company_name,
        cm.logo FROM  `jobs` AS j
        LEFT JOIN  `keyword` AS k ON  `k`.`job_id` =  `j`.`id`
        LEFT JOIN  `keyword_master` AS km ON  `km`.`id` =  `k`.`keyword_id`
        LEFT JOIN  `location_master` AS l ON  `l`.`id` =  `j`.`location`
        LEFT JOIN  `company_master` AS cm ON  `cm`.`id` =  `j`.`company_id`
        WHERE km.name = '$skillname' AND j.uid='$userid' AND l.city='$location'
        ;");
    }

    // if($company != NULL && )

    return $query->result_array();
}

最佳答案

如果我理解正确，您需要根据用户输入动态更改查询。
要做到这一点，你应该把查询本身和查询的函数分开。
伪代码中的Ex：

// Let's suppose it's your base query
// (that meets the minimum field required to do the research).
$sql = "SELECT j.id AS job_id, j.created_date,j.title,... WHERE
         km.name = '$skillname'";

// U add the condition skill if the user typed it
if(isset($_POST['skill'])
    $sql .= "AND j.skill = '$_POST['skill']'";

... (for every input filled u add condition to the query)

// WHEN all input u needed to add are tested
// Query the DB
$query = $this->db->query($sql);

你甚至可以做得更好，制作一个包含所有输入名字段的数组，以便循环到它上面。

关于php - 如何在php中动态添加多个WHERE子句，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30412857/