[HY000][1267] Illegal mix of collations (utf8mb4_general_ci,IMPLICIT) and (utf8mb4_0900_ai_ci,IMPLIC for operation '='

在鏈接地址?connectionCollation=utf8mb4_general_ci指定下

或者下面方式

 

出現這種問題就是關聯表的字符集不匹配

1.查看數據庫的字符集

show variables where Variable_name like 'collation%';
結果：

 2.查看關聯表字符集

show create table table_name;

3.給關聯表設置字符編碼

alter table table_name default character set utf8mb4 collate=utf8mb4_general_ci;

4.給關聯表字段設置字符編碼

ALTER TABLE table_name convert to CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;