C#导入Excel数据时的一个BUG
BUG描述如下：
EXCEL测试数据如下图：
在进行SQL数据导入时无法将第二行和第五行的value值导入，如下图：
经过在网上查找和实际操作检验，最终找到了一个解决办法：
1、在连接Excel的Oledb串中加上 IMEX=1，使得 Excel 表格中混合列(即该列中的包含有多种类型的数据)被 ADO.NET 认为其数据类型是 String 。如果某列的数据全部都是一种类型，如数字型，那么 ADO.NET 仍然认为该是列的类型是其数据的类型。
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1"""
"HDR=Yes;" indicates that the first row contains columnnames, not data
"IMEX=1;" tells the driver to always read "intermixed" data columns as text
TIP! SQL syntax: "SELECT * FROM [sheet1$]" - i.e. worksheet name followed by a "$" and wrapped in "[" "]" brackets.
"HDR=Yes;" indicates that the first row contains columnnames, not data
"IMEX=1;" tells the driver to always read "intermixed" data columns as text
TIP! SQL syntax: "SELECT * FROM [sheet1$]" - i.e. worksheet name followed by a "$" and wrapped in "[" "]" brackets.
2、修改注册表键值。
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Jet\4.0\Engines\Excel]
located registry REG_DWORD "TypeGuessRows". That's the key to not letting Excel use only the first 8 rows to guess the columns data type. Set this value to 0 to scan all rows. This might hurt performance.
通过以上两个操作后，测试导入功能一切正常。
