将空值和逗号导入 MYSQL答案

【问题标题】：Importing nulls and commas into MYSQL将空值和逗号导入 MYSQL
【发布时间】：2012-08-20 19:21:47
【问题描述】：

我正在像这样将文件导入 MYSQL：

LOAD DATA LOCAL INFILE 'C:\\Users\\Justin.Mathieu\\Documents\\data.csv' into table Ingredients
fields terminated by ','
optionally enclosed by '"' 
lines terminated by '\n'
(iVendor, iName, iOrderNumber, iCaseQty, iUnitSize, iDrainSize, iUnitSoldBy, iCaseCost, iVolumeConversion, iUnitLabel, iIngredients)

以及一些导入数据的样本：

VendorName,"Apple Whole Peeled Cored Grd A Fz",61318,1,\N,\N,\N,38.17,\N,\N,\N
VendorName,"Apples- Applesauce Sweetened",10738,6,\N,\N,-1,24,\N,\N,\N
VendorName,"Applesauce Unswtn Fancy",10676,6,106,\N,-1,23.97,\N,\N,"Apples, Water, Erythorbic Acid (To Maintain Color)"
VendorName,Apron 24"X42" White Reg Wt - Dispenser ,81463,1,\N,\N,\N,9.98,\N,\N,\N
VendorName,"Artichoke Heart 40-50Cnt Quartered,     Marintated",10722,6,88,\N,-1,71.46,\N,,"Artichoke Hearts, Vegetable Oil (Soya Or Sunflower), Water, Vinegar"
VendorName,"Artichoke Heart Crse Ct",77334,6,\N,55,\N,49.16,\N,\N,\N
VendorName,"Artichoke Heart Quarters",11804,6,\N,\N,-1,62.46,\N,\N,"Artichoke Hearts, Water, Salt And Citric Acid"
VendorName,"Artichoke Quarters Mixed Cuts",D6808,6,\N,\N,\N,60.26,\N,\N,\N
VendorName,"Bacon Bit Real Ref",56188,2,\N,\N,\N,51.22,\N,\N,\N
VendorName,"Barley Pearled Dry Us #1 Standard",33050,2,\N,\N,\N,21.38,\N,\N,\N

第一个问题是使用\N。在导入后查看我的数据库时，我在 iIngredients 字段中得到“N”，而不是得到空值。

第二个问题是大多数行没有被导入，这是我得到的错误示例：

164 row(s) affected, 64 warning(s): 
1262 Row 3 was truncated; it contained more data than there were input columns 
1262 Row 5 was truncated; it contained more data than there were input columns 
1262 Row 9 was truncated; it contained more data than there were input columns 
1262 Row 10 was truncated; it contained more data than there were input columns 
1262 Row 11 was truncated; it contained more data than there were input columns 
1262 Row 12 was truncated; it contained more data than there were input columns 
Records: 164  Deleted: 0  Skipped: 0  Warnings: 94

我已验证每一行都有任何可能包含逗号的数据，需要用“”包裹。

有什么想法吗？

编辑：我能够解决 \N 问题，只需将 "" 用于字符串行，将 \N 用于非字符串行。

编辑 2： 在被截断的行中，iIngredients 字段包含下一行的所有数据，就好像它没有检测到以 ".

【问题讨论】：

这是 MySQL 本身的一个错误。 See the link
您能否通过\Ns 并用空白替换它们以便插入,,？你能告诉我们一些被截断的行吗？

标签： mysql csv import null

【解决方案1】：

在闲逛之后，我想通了。

问题是，当我将文件转换为为空字段插入“/N”时（在 C# 中），我使用的是：

Write(rowData + Environment.NewLine);

显然 MySQL 真的不喜欢这样，所以我把它改成了：

Write(rowData + "\n");

这似乎工作得很好。

【讨论】：

【解决方案2】：

看来是行分隔符有问题，请检查它们是否在您的文件中为 '\n'，或者尝试在 LOAD DATA 命令中使用 '\r\n'。

另外，我看不出 \N 有什么问题，它按原样工作。

【讨论】：

【解决方案3】：

mysql 无法识别 '\n' 换行

【讨论】：