如何解决UpdateItem Dynamodb Boto3 说查询错误
我正在尝试增加特定列的值。 我正在使用 Boto3。
update_query = '#clicks.#OS.#os = #clicks.#OS.#os + :inc,#clicks.#Brands.#brand = #clicks.#Brands.#brand + :inc,#clicks.#RAMs.#ram = #clicks.#RAMs.#ram + :inc'
table_urls.update_item(
Key={
'urlid': urlid
},UpdateExpression=update_query,ExpressionAttributeValues={
':inc' : Decimal(1)
},ExpressionAttributeNames={
"#os" : os,"#brand": brand,"#ram" : ram,"#clicks": "clicks","#OS" : "OS","#Brands": "Brands","#RAMs" : "RAMs"
},ReturnValues='NONE'
)
An error occurred (ValidationException) when calling the UpdateItem operation: Invalid UpdateExpression: Syntax error; token: "#clicks",near: "#clicks."
QUERY::>> #clicks.#OS.#os = #clicks.#OS.#os + :inc,#clicks.#RAMs.#ram = #clicks.#RAMs.#ram + :inc
解决方法
尝试在 update_query 字符串的开头添加 SET
。一切休息似乎都很正常。
update_query = 'SET #clicks.#OS.#os = #clicks.#OS.#os + :inc,#clicks.#Brands.#brand = #clicks.#Brands.#brand + :inc,#clicks.#RAMs.#ram = #clicks.#RAMs.#ram + :inc'
table_urls.update_item(
Key={
'urlid': urlid
},UpdateExpression=update_query,ExpressionAttributeValues={
':inc' : Decimal(1)
},ExpressionAttributeNames={
"#os" : os,"#brand": brand,"#ram" : ram,"#clicks": "clicks","#OS" : "OS","#Brands": "Brands","#RAMs" : "RAMs"
},ReturnValues='NONE'
)
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