lua entry thread aborted: runtime error: /usr/../process.lua:448: attempt to concatenate field 'np_sum_duration' (a userdata value)

【1】问题场景原代码

引起问题的原代码，访问数据库，汇总数据后，使用汇总结果报异常：

     local function amount_sum_fee(cycleid)
         local select_productid = "select product_id from np_cdr_" .. cycleid .. " group by product_id;"
         local rtn, productid_set = executeSql(select_productid)
         if rtn then

             local sql_const = "insert into compare_fee_" .. cycleid .. " (product_id, np_id, np_sum_duration, np_total_times, " ..
             " np_sum_qty, np_sum_fee, un_sum_duration, un_total_times, un_sum_fee, sum_np_fee, sum_original_fee) values "
             if type(productid_set) == 'table' and next(productid_set) ~= nil then
                 for key, record in pairs(productid_set) do
                     local amount_table = {}
                     amount_table["product_id"] = record["product_id"]
                     amount_table["np_id"] = 'all'
                     -- np总费用统计
                     local np_sum_fee = "SELECT product_id, SUM(duration) AS np_sum_duration, " ..
                     " COUNT(id) AS np_sum_cdrCnt, " ..
                     " SUM(service_qty) AS np_service_qty, " ..
                     " SUM(service_fee) AS np_service_fee, " ..
                     " SUM(np_fee) AS np_sum_fee, " ..
                     " SUM(original_fee) AS np_sum_original_fee " ..
                     " FROM np_cdr_" .. cycleid .. " WHERE product_id = '" .. record["product_id"] .. "';"
                     local rtn, desc = executeSql(np_sum_fee)
                     if rtn and next(desc) ~= nil then
                         amount_table[]["np_sum_duration"]
                         amount_table[]["np_sum_cdrCnt"]
                         amount_table[]["np_service_qty"]
                         amount_table[]["np_service_fee"]
                         amount_table[]["np_sum_fee"]
                         amount_table[]["np_sum_original_fee"]
                     end
                     -- un总费用统计
                     local un_sum_fee = "SELECT product_id, SUM(total_duration) AS un_sum_duration, " ..
                     " SUM(total_times) AS un_sum_cdrCnt, " ..
                     " SUM(total_fee) AS un_sum_fee " ..
                     " FROM dat_bill_" .. cycleid .. " WHERE call_type & 4097 > 0 AND product_id = '" .. record["product_id"] .. "';"
                     local rtn, desc = executeSql(un_sum_fee)
                     if rtn and next(desc) ~= nil then
                         amount_table[]["un_sum_duration"]
                         amount_table[]["un_sum_cdrCnt"]
                         amount_table[]["un_sum_fee"]
                     end
                     -- 构建sql语句
                      then
                         insert_sql = insert_sql .. ","
                     else
                         insert_sql = sql_const
                     end
                     insert_sql = insert_sql .. "('" ..
                     amount_table["product_id"] .. "', '" ..
                     amount_table["np_id"] .. "', " ..
                     amount_table["np_sum_duration"] .. ", " ..
                     amount_table["np_total_times"] .. ", " ..
                     amount_table["np_sum_qty"] .. ", " ..
                     amount_table["np_sum_fee"] .. ", " ..
                     amount_table["un_sum_duration"] .. ", " ..
                     amount_table["un_total_times"].. ", " ..
                     amount_table["un_sum_fee"] .. ", " ..
                     amount_table["sum_np_fee"] .. ", " ..
                     amount_table["sum_original_fee"] .. ")"
                     value_count = value_count +
                      == value_count then
                         sum_count = sum_count + value_count
                         insert_sql = insert_sql .. "; commit;"
                         local rtn, result = executeSql(insert_sql)
                         if not rtn then
                             rtnstr[
                             rtnstr["msg"] = "Error. amount_sum_fee insert into sum_fee num : " .. sum_count .. " sql : " .. insert_sql
                             return false
                         else
                             local result = "compare: success to amount_sum_fee insert into sum_fee num : " .. sum_count
                             ngx.log(ngx.ERR, result)
                         end
                         insert_sql = ""
                         value_count =
                     end
                 end
                  then
                     sum_count = sum_count + value_count
                     insert_sql = insert_sql .. "; commit;"
                     local rtn, result = executeSql(insert_sql)
                     if not rtn then
                         rtnstr[
                         rtnstr["msg"] = "Error. amount_sum_fee insert into sum_fee num : " .. sum_count .. " sql : " .. insert_sql
                         return false
                     else
                         local result = "compare: success to amount_sum_fee insert into sum_fee num : " .. sum_count
                         ngx.log(ngx.ERR, result)
                     end
                     insert_sql = ""
                     value_count =
                 end
             end
         else
             rtnstr[
             rtnstr["msg"] = "Failed to select product_id amount_sum_fee error : " .. productid_set
             return false
         end
         return true
     end

使用的是SQL中的sum函数

【2】分析原因

数据库访问汇总数据时，SUM函数的结果可能为NULL值。如下图：

修改SQL语句，添加IFNULL判断，若为NULL，则为0即可。如下图：

如上原因分析。

【3】修复后代码

     local function amount_sum_fee(cycleid)
         local select_productid = "select product_id from np_cdr_" .. cycleid .. " group by product_id;"
         local rtn, productid_set = executeSql(select_productid)
         if rtn then

             local sql_const = "insert into compare_fee_" .. cycleid .. " (product_id, np_id, np_sum_duration, np_total_times, " ..
             " np_sum_qty, np_sum_fee, un_sum_duration, un_total_times, un_sum_fee, sum_np_fee, sum_original_fee) values "
             if type(productid_set) == 'table' and next(productid_set) ~= nil then
                 for key, record in pairs(productid_set) do
                     local amount_table = {}
                     amount_table["product_id"] = record["product_id"]
                     amount_table["np_id"] = 'all'
                     -- np总费用统计
                     local np_sum_fee = "SELECT product_id, IFNULL(SUM(duration), 0) AS np_sum_duration, " ..
                     " COUNT(id) AS np_sum_cdrCnt, " ..
                     " IFNULL(SUM(service_qty), 0) AS np_service_qty, " ..
                     " IFNULL(SUM(service_fee), 0) AS np_service_fee, " ..
                     " IFNULL(SUM(np_fee), 0) AS np_sum_fee, " ..
                     " IFNULL(SUM(original_fee), 0) AS np_sum_original_fee " ..
                     " FROM np_cdr_" .. cycleid .. " WHERE product_id = '" .. record["product_id"] .. "';"
                     local rtn, desc = executeSql(np_sum_fee)
                     if rtn and next(desc) ~= nil then
                         amount_table[]["np_sum_duration"]
                         amount_table[]["np_sum_cdrCnt"]
                         amount_table[]["np_service_qty"]
                         amount_table[]["np_service_fee"]
                         amount_table[]["np_sum_fee"]
                         amount_table[]["np_sum_original_fee"]
                     end
                     -- un总费用统计
                     local un_sum_fee = "SELECT product_id, IFNULL(SUM(total_duration), 0) AS un_sum_duration, " ..
                     " IFNULL(SUM(total_times), 0) AS un_sum_cdrCnt, " ..
                     " IFNULL(SUM(total_fee), 0) AS un_sum_fee " ..
                     " FROM dat_bill_" .. cycleid .. " WHERE call_type & 4097 > 0 AND product_id = '" .. record["product_id"] .. "';"
                     local rtn, desc = executeSql(un_sum_fee)
                     if rtn and next(desc) ~= nil then
                         amount_table[]["un_sum_duration"]
                         amount_table[]["un_sum_cdrCnt"]
                         amount_table[]["un_sum_fee"]
                     end
                     -- 构建sql语句
                      then
                         insert_sql = insert_sql .. ","
                     else
                         insert_sql = sql_const
                     end
                     insert_sql = insert_sql .. "('" ..
                     amount_table["product_id"] .. "', '" ..
                     amount_table["np_id"] .. "', " ..
                     amount_table["np_sum_duration"] .. ", " ..
                     amount_table["np_total_times"] .. ", " ..
                     amount_table["np_sum_qty"] .. ", " ..
                     amount_table["np_sum_fee"] .. ", " ..
                     amount_table["un_sum_duration"] .. ", " ..
                     amount_table["un_total_times"].. ", " ..
                     amount_table["un_sum_fee"] .. ", " ..
                     amount_table["sum_np_fee"] .. ", " ..
                     amount_table["sum_original_fee"] .. ")"
                     value_count = value_count +
                      == value_count then
                         sum_count = sum_count + value_count
                         insert_sql = insert_sql .. "; commit;"
                         local rtn, result = executeSql(insert_sql)
                         if not rtn then
                             rtnstr[
                             rtnstr["msg"] = "Error. amount_sum_fee insert into sum_fee num : " .. sum_count .. " sql : " .. insert_sql
                             return false
                         else
                             local result = "compare: success to amount_sum_fee insert into sum_fee num : " .. sum_count
                             ngx.log(ngx.ERR, result)
                         end
                         insert_sql = ""
                         value_count =
                     end
                 end
                  then
                     sum_count = sum_count + value_count
                     insert_sql = insert_sql .. "; commit;"
                     local rtn, result = executeSql(insert_sql)
                     if not rtn then
                         rtnstr[
                         rtnstr["msg"] = "Error. amount_sum_fee insert into sum_fee num : " .. sum_count .. " sql : " .. insert_sql
                         return false
                     else
                         local result = "compare: success to amount_sum_fee insert into sum_fee num : " .. sum_count
                         ngx.log(ngx.ERR, result)
                     end
                     insert_sql = ""
                     value_count =
                 end
             end
         else
             rtnstr[
             rtnstr["msg"] = "Failed to select product_id amount_sum_fee error : " .. productid_set
             return false
         end
         return true
     end

【4】总结

Lua中使用SQL语句进行汇总数据时，切记需要作NULL判断。

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