Senior PHP development case (1) : use MYSQL statement across the table query cannot export all records of the solution

in the actual case development process,使用mysqlQuery statements across tables to export database content.但是经过比对,It is always found that the exported records are less than the actual records.经查发现：Some users of the user table are deleted,The result is that the export record cannot be read normally and the export record is missing.

原代码

  //$sql = "select a.pro_id,a.user_id,a.pro_serial,a.pro_name,a.pro_category,a.smallCategory,a.threeCategory,a.user_city,a.user_area,a.pro_declarant,b.user_id,b.user_phone,c.pro_id,c.leader_name,c.leader_phone,(CASE a.pro_audit when 0 then '未审核' when 2 then 'District review' when 3 then 'Municipal audit' when 4 then 'Provincial audit' when 5 then '审核完成' when -1 then '退回' END) AS pro_audit,(CASE a.user_surveyor_type when 2 then '县属' when 3 then '市属' when 4 then '省属' END) AS user_surveyor_type,d.pro_id,d.agency_name FROM " . $db->table('project') . " AS a, " . $db->table('user') . " AS b," . $db->table('leader') . " AS c";//", " . $db->table('agency') . " AS d ";
        $sql = "select a.pro_id,a.user_id,a.pro_serial,a.pro_name,a.pro_category,a.smallCategory,a.threeCategory,a.user_city,a.user_area,a.pro_declarant,b.user_id,b.user_phone,c.pro_id,c.leader_name,c.leader_phone,(CASE a.pro_audit when 0 then '未审核' when 2 then 'District review' when 3 then 'Municipal audit' when 4 then 'Provincial audit' when 5 then '审核完成' when -1 then '退回' END) AS pro_audit,(CASE a.user_surveyor_type when 2 then '县属' when 3 then '市属' when 4 then '省属' END) AS user_surveyor_type FROM " . $db->table('project') . " AS a, " . $db->table('user') . " AS b," . $db->table('leader') . " AS c";//", " . $db->table('agency') . " AS d ";
        $sql .= " WHERE a.user_id = b.user_id AND a.pro_id = c.pro_id";// AND a.pro_id = d.pro_ida.pro_audit <> 0 AND
        $sql .= " ORDER BY a.pro_id DESC";
        $row = $db->queryall($sql);
        $infoName = "项目信息表" . date("Y.m.d");

解决方案

 case "exp";
        require 'libs/project.export.php';
        $sql = "select pro_id,user_id,pro_serial,pro_name,pro_category,smallCategory,threeCategory,user_city,user_area,pro_declarant,(CASE pro_audit when 0 then '未审核' when 2 then 'District review' when 3 then 'Municipal audit' when 4 then 'Provincial audit' when 5 then '审核完成' when -1 then '退回' END) AS pro_audit,(CASE user_surveyor_type when 2 then '县属' when 3 then '市属' when 4 then '省属' END) AS user_surveyor_type FROM " . $db->table('project') . " WHERE 1";
        $sql .= " ORDER BY pro_id DESC";
        $row = $db->queryall($sql);

        //读取用户信息;
        foreach ($row as $k => $v) {
    
            $sql_u = "select user_phone from " . $db->table('user');
            $sql_u .= " WHERE user_id =" . $v['user_id'];
            $row[$k]["user"] = $db->queryall($sql_u);
        }

        //Read the person-in-charge information;
        foreach ($row as $k => $v) {
    
            $sql_l = "select leader_name,leader_phone from " . $db->table('leader');
            $sql_l .= " WHERE pro_id =" . $v['pro_id'];
            $row[$k]["leader"] = $db->queryall($sql_l);
        }

        //Read institution information;
        foreach ($row as $k => $v) {
    
            $sql_a = "select agency_name from " . $db->table('agency');
            $sql_a .= " WHERE pro_id =" . $v['pro_id'];
            $row[$k]["leader"] = $db->queryall($sql_a);
        }
        
        $infoName = "项目信息表" . date("Y.m.d");

@lockdata.cn