mysql遇到Variable can’t be set to the value of ‘NULL’
原因:MySQL根據配置檔案會限制Server接受的資料包大小。有時候大的插入和更新會受 max_allowed_packet 引數限制,導致寫入或者更新失敗。
檢視:show VARIABLES like '%max_allowed_packet%';
設定:set global max_allowed_packet=10000000000;
或配置my.cnf的max_allowed_packet = 20M
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