我将为 GUID 创建一个带有CHAR(38) 的新表。将您的数据导入到此暂存表中，然后使用CAST(SUBSTRING(GUID, 2, 36) AS UNIQUEIDENTIFIER) 将其转换为将暂存数据导入到您的永久表中。这种方法也适用于奇数格式的日期、带有货币符号的数字或任何格式不佳的输入。
BCP 格式文件有点棘手，但基本上并不太复杂。如果该部分继续给您带来麻烦，一种选择是将整行作为单个 VARCHAR(1000) 字段导入，然后在 SQL 中将其拆分 - 如果您对 SQL 文本处理感到满意的话。
或者，如果您熟悉其他一些编程语言，例如 Perl 或 C#，您可以创建一个脚本来将您的输入预处理为更友好的形式，例如制表符分隔。如果您不熟悉其他编程语言，我建议您选择一种并开始使用！ SQL 是一门很棒的语言，但有时您需要不同的工具；它不适合文本处理。
如果您熟悉 C#，这是我生成格式文件的代码。没有人会取笑我的白石缩进：P
private static string CreateFormatFile(string filePath, SqlConnection connection, string tableName, string[] sourceFields, string[] destFields, string fieldDelimiter, string fieldQuote)
{
string formatFilePath = filePath + ".fmt";
StreamWriter formatFile = null;
SqlDataReader data = null;
try
{
// Load the metadata for the destination table, so we can look up fields' ordinal positions
SqlCommand command = new SqlCommand("SELECT TOP 0 * FROM " + tableName, connection);
data = command.ExecuteReader(CommandBehavior.SchemaOnly);
DataTable schema = data.GetSchemaTable();
Dictionary<string, Tuple<int, int>> metadataByField = new Dictionary<string, Tuple<int, int>>();
foreach (DataRow row in schema.Rows)
{
string fieldName = (string)row["ColumnName"];
int ordinal = (int)row["ColumnOrdinal"] + 1;
int maxLength = (int)row["ColumnSize"];
metadataByField.Add(fieldName, new Tuple<int, int>(ordinal, maxLength));
}
// Begin the file, including its header rows
formatFile = File.CreateText(formatFilePath);
formatFile.WriteLine("10.0");
formatFile.WriteLine(sourceFields.Length);
// Certain strings need to be escaped to use them in a format file
string fieldQuoteEscaped = fieldQuote == "\"" ? "\\\"" : fieldQuote;
string fieldDelimiterEscaped = fieldDelimiter == "\t" ? "\\t" : fieldDelimiter;
// Write a row for each source field, defining its metadata and destination field
for (int i = 1; i <= sourceFields.Length; i++)
{
// Each line contains (separated by tabs): the line number, the source type, the prefix length, the field length, the delimiter, the destination field number, the destination field name, and the collation set
string prefixLen = i != 1 || fieldQuote == null ? "0" : fieldQuote.Length.ToString();
string fieldLen;
string delimiter = i < sourceFields.Length ? fieldQuoteEscaped + fieldDelimiterEscaped + fieldQuoteEscaped : fieldQuoteEscaped + @"\r\n";
string destOrdinal;
string destField = destFields[i - 1];
string collation;
if (destField == null)
{
// If a field is not being imported, use ordinal position zero and a placeholder name
destOrdinal = "0";
fieldLen = "32000";
destField = "DUMMY";
collation = "\"\"";
}
else
{
Tuple<int, int> metadata;
if (metadataByField.TryGetValue(destField, out metadata) == false) throw new ApplicationException("Could not find field \"" + destField + "\" in table \"" + tableName + "\".");
destOrdinal = metadata.Item1.ToString();
fieldLen = metadata.Item2.ToString();
collation = "SQL_Latin1_General_CP1_CI_AS";
}
string line = String.Join("\t", i, "SQLCHAR", prefixLen, fieldLen, '"' + delimiter + '"', destOrdinal, destField, collation);
formatFile.WriteLine(line);
}
return formatFilePath;
}
finally
{
if (data != null) data.Close();
if (formatFile != null) formatFile.Close();
}
}
当时我没有为数据读取器使用using 块是有原因的。