MYSQL生成json字符串

在mysql中生成json字符串mysql   假設表A，字段A1 int,A2 varchar,A3 text,A4 bool。sql   生成單條記錄的json："A":{"A1":A1Value,"A2":"A2Value","A3":"A3Value","A4":A4Value}json     SET @JSONSTRING='';字符串   SELECT CONCAT(di     

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