正確的語法的MySQL服務器版本使用附近'VARCHAR（500））

Question

我已經將我的數據庫從MSQL轉換到MySQL，我得到以下錯誤。

錯誤消息：您的SQL語法錯誤;檢查對應於你的MySQL服務器版本正確的語法的線附近的「VARCHAR（500））=‘男’AND Responses.res_void = 0」使用手冊22

我不能工作的問題，它看起來對我有效嗎？有沒有MySQL不在這裏？

SELECT 
    Responses.res_col AS answer 
    ,Responses.res_created AS dateCreated 
    ,Responses.res_notes AS note 
    ,Responses.question_id AS questionID 
    ,Responses.res_id AS responseID 
    ,Responses.student_id AS studentID 
    ,Responses.res_answer AS subQuestion 
    ,Responses.survey_id AS surveyID 
    ,Responses.res_void AS void 
    ,Student.res_answer AS filter 
    FROM 
     Responses, Responses AS Student 
    WHERE 
     Responses.student_id = Student.student_id 
    AND 
     Responses.survey_id = <cfqueryparam cfsqltype="cf_sql_integer" value="#arguments.surveyID#"> 
    AND 
     Student.survey_id = <cfqueryparam cfsqltype="cf_sql_integer" value="#arguments.surveyID#"> 
    AND 
     Responses.question_id = <cfqueryparam cfsqltype="cf_sql_integer" value="#arguments.questionID#">     AND 
     CAST(Student.res_answer AS VARCHAR(500)) = '#arguments.filter#' 
    AND Responses.res_void = <cfqueryparam cfsqltype="cf_sql_bit" value="#arguments.void#"> 

Answer 1

你不能強制轉換爲VARCHAR()類型。你可以轉換爲純文本類型爲CHAR(n)：

CAST(Student.res_answer AS CHAR(500)) = '#arguments.filter#' 

從mysql doc，對於結果的類型可以是下列值之一：

• BINARY[(N)]
• CHAR[(N)]
• DATE
• DATETIME
• DECIMAL[(M[,D])]
• SIGNED [INTEGER]
• TIME
• UNSIGNED [INTEGER]