Question

数据库：

选

|  ID  |  TITLE  |  COMPANY_ID  |
|  1   |   One   |      1       |
|  2   |   One   |      1       |
|  3   |   One   |      1       |

公司

|  ID  |  NAME  |
|  1   |   One  |
|  2   |   Two  |
|  3   |  Three |

我有PDO MYSQL声明：

"SELECT 
listings.ID,
listings.TITLE,
listings.COMPANY_ID,
companies.ID,
companies.NAME 
FROM listings INNER JOIN companies ON (listings.COMPANY_ID = companies.ID ) WHERE (listings.TITLE = :p1 AND companies.NAME = :p2 )LIMIT 10"

关联数组输出：

Array
(
    [ID] => 1
    [TITLE] => analyst
    [COMPANY_ID] => 1
    [NAME] => one
)
Array
(
    [ID] => 1
    [TITLE] => analyst
    [COMPANY_ID] => 1
    [NAME] => one
)
Array
(
    [ID] => 1
    [TITLE] => analyst
    [COMPANY_ID] => 1
    [NAME] => one
)

执行此查询时，我输出到PHP fetch关联数组的ID字段将返回为1。

除ID外，输出按预期工作。

为什么我的ID值会发生变化？

______________________

方法：

protected function search_joined($parameters, $func){
        $field = "*";
        if(isset($parameters["fields"])){
            if($parameters["fields"] != "*" && gettype($parameters["fields"]) == gettype(array())){
                if(count($parameters["fields"]) == 2){
                    $field = "";
                    foreach($parameters["fields"] as $key=>$v){
                        foreach($v as $v_){
                            $field.= $parameters["tables"][$key] . "." . $v_ . ",";
                        }
                    }
                    $field = rtrim($field, ",");
                }
            }
        }

        $cond_ = "";
        $values = array();      
        if(gettype($parameters["condArry"]) == gettype(array())){
            $COND_TYPE = " AND ";
            foreach($parameters["condArry"] as $v){
                $operator = " = ";
                if($v[1][0] == "%" || substr($v[1], -1) == "%"){
                    $operator=" LIKE ";
                }
                if(substr($v[1], 5) == "L::_>"){
                    $operator=" > ";
                    $v[1] = str_replace($v[1], "L::_>", "");
                }
                if($v[1][0] == "!"){
                    $operator=" != ";
                    //$v[1] = str_replace($v[1], "!", "");
                    $v[1] = substr($v[1], 1);
                }
                $COND_TYPE = (
                    (isset($v[2]))? 
                        (
                            ($v[2] == "&")? " AND " : 
                                (
                                    (($v[2]=="||")? " OR ": "")
                                )
                        ): " AND "
                );
                $unique = md5($v[0] . $v[1]);

                $cond_.= $v[0] . $operator . ":".substr($v[0], strpos($v[0], ".") + 1).$unique. " " . $COND_TYPE . " ";
                $values[':'.substr($v[0], strpos($v[0], ".") + 1).$unique] = $v[1];
            }
            $cond_ = "WHERE (" . substr($cond_, 0, strlen($COND_TYPE)*(-1)) . ")";
        }

        //$cond_ = rtrim($cond_, ",");
        $joiner = $parameters["tables"][0] . "." . $parameters["joiner"][0] . "=" . $parameters["tables"][1] . "." . $parameters["joiner"][1] . " ";

        $sql = "SELECT ". $field . " FROM " . $parameters["tables"][0] . " INNER JOIN " . $parameters["tables"][1] . " ON (" . $joiner . ") " .$cond_ . (isset($parameters["LIMIT"])? "LIMIT " . $parameters["LIMIT"]: "");
        echo $sql;
        if(isset($parameters["test"])){
            if($parameters["test"] == true){
                echo "<br>". $sql . "<br>";
            }
        }
        //echo "<br>". $sql . "<br>";
        $q = $parameters["connection"]->prepare($sql);

        foreach($values as $key => $v){
            $q->bindvalue($key, $v);
            echo "<br>" . $key . " : " . $v . "<br>";
        }
        $q->execute();
        while($row = $q->fetch(PDO::FETCH_ASSOC)) {
            if(!$func($row)){
                break;
            }
        }
        $conTableArry = null;
    }

CALLER：

$params_= array(
            "connection"=>$this->connection_,
            "tables"=>array("listings", "companies"),
            "joiner"=>array("COMPANY_ID","ID"),
            "fields"=> array(
                array(
                    "ID",
                    "TITLE",
                    "PAYMIN", 
                    "PAYMAX", 
                    "GEO_LOCATIONS_ID", 
                    "CRIMINAL_HISTORY_REQ", 
                    "EVAL_EXAM_REQ", 
                    "AGE_REQ", 
                    "EX_REQ", 
                    "DRIVERS_LICENSE_REQ", 
                    "CERTIFICATE_REQ", 
                    "EDUCATION_REQ", 
                    "RESUME_REQ" , 
                    "POSITIONS",
                    "COMPANY_ID"
                ),
                array(
                    "ID",
                    "NAME"
                )
            ),
            "condArry"=>array(array("listings.TITLE", "analyst"), array("companies.NAME", "suitespec")),
            "LIMIT"=>$LIMIT,
        );

        parent::search_joined($params_, function($r){
            out($r);
            return true;
        });

Answer 1

你的SQL中有一些令人困惑的语法

SELECT 
     listings.ID,
     listings.TITLE,
     listings.COMPANY_ID,
     companies.ID,
     companies.NAME 
FROM listings 
     INNER JOIN companies ON (listings.COMPANY_ID = companies.ID ) 
WHERE (listings.TITLE = :p1 AND companies.NAME = :p2 )
LIMIT 10

您有两个ID列，没有别名。所以你可能会得到第二个ID。尝试对第二个ID列进行别名并再次尝试

SELECT 
     listings.ID,
     listings.TITLE,
     listings.COMPANY_ID,
     companies.ID AS comp_id,
     companies.NAME

Answer 2

您应该能够通过为结果集使用唯一的列名来解决此问题（您目前使用ID两次）。

将SQL更改为以下内容：

"SELECT 
    listings.ID,
    listings.TITLE,
    listings.COMPANY_ID,
    companies.ID AS CID,
    companies.NAME 
FROM listings
    INNER JOIN companies ON (listings.COMPANY_ID = companies.ID )
WHERE (listings.TITLE = :p1
    AND companies.NAME = :p2 )LIMIT 10"

注意第5行。我已将其从companies.ID更改为companies.ID AS CID。

MYSQL字段ID值更改

2 个答案: