python报错“must be str, not int”

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for i in range(3):
                    j=i+1
                    sqlstr="  insert into T_DATA_RISK(STATIONCODE,MONIDATE,RATE_PM25,RATE_NO2,STYLE)\
                    select a.id,a.recordtime,a.pm25/25.0 RATE_PM25,[dbo].[RiskData](a.no2,1) RATE_NO2,"+j+" STYLE \
                    from T_MIC_DATAAIRDAY a join T_MIC_STATION b on a.id=b.id \
                    where b.stationtype=2 and a.recordtime='"+monidate+"'"

修改如下

添加引用

import json

for i in range(3):
                    j=i+1
                    j=json.dumps(j)
                    print(j)
                    sqlstr="  ....."

参考https://jingyan.baidu.com/article/adc81513a75bcaf723bf73a0.html