本文整理汇总了C#中IDbConnection.GetColumns方法的典型用法代码示例。如果您正苦于以下问题：C# IDbConnection.GetColumns方法的具体用法？C# IDbConnection.GetColumns怎么用？C# IDbConnection.GetColumns使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IDbConnection的用法示例。
在下文中一共展示了IDbConnection.GetColumns方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: VerifyDataTableSchema
void VerifyDataTableSchema(string dataTableName, IDbConnection connection)
{
// [id] [uniqueidentifier] NOT NULL,
// [revision] [int] NOT NULL,
// [data] [varbinary](max) NOT NULL,
var expectedDataTypes = new Dictionary<string, SqlDbType>(StringComparer.InvariantCultureIgnoreCase)
{
{"id", SqlDbType.UniqueIdentifier },
{"revision", SqlDbType.Int },
{"data", SqlDbType.VarBinary },
};
var columns = connection.GetColumns(dataTableName);
foreach (var column in columns)
{
// we skip columns we don't know about - don't prevent people from adding their own columns
if (!expectedDataTypes.ContainsKey(column.Name)) continue;
var expectedDataType = expectedDataTypes[column.Name];
if (column.Type == expectedDataType) continue;
// special case: migrating from Rebus 0.99.59 to 0.99.60
if (column.Name == "data" && column.Type == SqlDbType.NVarChar && expectedDataType == SqlDbType.VarBinary)
{
throw new RebusApplicationException(@"Sorry, but the [data] column data type was changed from NVarChar(MAX) to VarBinary(MAX) in Rebus 0.99.60.
This was done because it turned out that SQL Server was EXTREMELY SLOW to load a saga's data when it was saved as NVarChar - you can expect a reduction in saga data loading time to about 1/10 of the previous time from Rebus version 0.99.60 and on.
Unfortunately, Rebus cannot help migrating any existing pieces of saga data :( so we suggest you wait for a good time when the saga data table is empty, and then you simply wipe the tables and let Rebus (re-)create them.");
}
throw new RebusApplicationException($"The column [{column.Name}] has the type {column.Type} and not the expected {expectedDataType} data type!");
}
}