mysql調用存儲過程出現Illegal mix of collations錯誤

執行sql語句正常

執行存儲過程 異常

提示

Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='

解決辦法

CREATE PROCEDURE `proce_test`(admin_name VARCHAR(32) charset utf8)

 

 

 

 問題描述：MySQL進行字符串比較時發生錯誤：

 

SELECT  
    a.equ_no,  
    b.fullCode  
FROM  
    equipment a,  
    (  
        SELECT  
            t.*, getEquTypeFullCode (t.equType_id) AS fullCode  
        FROM  
            equ_type t  
    ) b  
WHERE  
    substring(a.equ_no, 1, 5) = b.fullCode  

 

錯誤如下：

 

 

[Err] 1267 - Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='  

 

解決方法：將比較等式一邊進行字符串轉換，如改為“CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci”

 

SELECT  
    a.equ_no,  
    b.fullCode  
FROM  
    equipment a,  
    (  
        SELECT  
            t.*, getEquTypeFullCode (t.equType_id) AS fullCode  
        FROM  
            equ_type t  
    ) b  
WHERE  
    substring(a.equ_no, 1, 5) = CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci;