Question

首先，我知道MySQL是一种折旧的语言，但我的主管坚持认为我使用它。

我的数据库中有三个表。他们是：＆＃34;学生＆＃34;，＆＃34;导师＆＃34;，＆＃34;匹配＆＃34; 。当我发现运行以下查询（$ query2）时，我正在检查确保该查询中的所有条件完全匹配。

如果完全匹配，我想在匹配表中插入以下内容：

"insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')";

＆＃34;匹配＆＃34;表包含列：

match_id(auto incremented), tutor_id, student_id, school_id

非常感谢任何帮助。

if(mysql_query($query2)){
    $check_availability =  "select * 
                            from tutors, students 
                            where tutor_availability = '$student_availability'
                            AND (tutor_subject_1 = '$student_subject_1'
                            OR tutor_subject_1 = '$student_subject_2'
                            OR tutor_subject_2 = '$student_subject_2'
                            OR tutor_subject_2 = '$student_subject_1')";    

    $run_5 = mysql_query($check_availability);

    if(mysql_num_rows($run_5)>0) {

        echo  "<script>alert('we have a match')</script>";
        my_sql_query($query3) =  "insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')";

        mysql_query($query3);
    } else{
        echo  "<script>alert('no match found')</script>";
    }
}

Answer 1

我认为这一行是错误的：

my_sql_query($query3) =  "insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')";

函数名拼写错误，参数不应该是$query3，而是实际查询：

mysql_query("insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')");

Answer 2

基本上，您必须将上一个查询的输出插入数据库。

更改

$check_availability =  "select * 
                        from tutors, students 
                        where tutor_availability = '$student_availability'
                        AND (tutor_subject_1 = '$student_subject_1'
                        OR tutor_subject_1 = '$student_subject_2'
                        OR tutor_subject_2 = '$student_subject_2'
                        OR tutor_subject_2 = '$student_subject_1')";

到

$check_availability =  "insert into match (tutor_id, student_id, school_id) 
                        select tutors.id, students.id, students.school_id 
                        from tutors, students 
                        where tutor_availability = '$student_availability'
                        AND (tutor_subject_1 = '$student_subject_1'
                        OR tutor_subject_1 = '$student_subject_2'
                        OR tutor_subject_2 = '$student_subject_2'
                        OR tutor_subject_2 = '$student_subject_1')";

Answer 3

您必须遍历该行才能获取要插入的值：

if(mysql_query($query2)){
    $check_availability =  "select * 
                            from tutors, students 
                            where tutor_availability = '$student_availability'
                            AND (tutor_subject_1 = '$student_subject_1'
                            OR tutor_subject_1 = '$student_subject_2'
                            OR tutor_subject_2 = '$student_subject_2'
                            OR tutor_subject_2 = '$student_subject_1')";    

    $run_5 = mysql_query($check_availability);

    if(mysql_num_rows($run_5)>0) {

        echo  "<script>alert('we have a match')</script>";
        while($row = mysql_fetch_assoc($run_5)) {
            $tutor_id = $row['tutor_id'];
            $student_id = $row['student_id'];
            $school_id = $row['school_id'];
            mysql_query("insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')");
        }

    } else{
        echo  "<script>alert('no match found')</script>";
    }
}

我不知道确切的字段名称，但它应该指向正确的方向。

Answer 4

也许尝试使用mysql_fetch_row（$ run_5）并将选择查询更改为仅拔出tutor_id，student_id和school_id。

if(mysql_query($query2)){
$check_availability =  "select t.tutor_id, s.student_id, t.school_id
                        from t.tutors, s.students 
                        where t.tutor_availability = '$student_availability'
                        AND (t.tutor_subject_1 = '$student_subject_1'
                        OR t.tutor_subject_1 = '$student_subject_2'
                        OR t.tutor_subject_2 = '$student_subject_2'
                        OR t.tutor_subject_2 = '$student_subject_1')";    

$run_5 = mysql_query($check_availability);

if(mysql_num_rows($run_5)>0) {

    echo  "<script>alert('we have a match')</script>";
    while($row = mysql_fetch_row($run_5)) {
        $tutor_id = $row[0];
        $student_id = $row[1];
        $school_id = $row[2];
        mysql_query("insert into match (tutor_id, student_id, school_id) values ('$tutor_id','$student_id','$school_id')");
    }

} else{
    echo  "<script>alert('no match found')</script>";
}

}

将多个表中的数据插入一个单独的表中

4 个答案: