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How to Pass Table-Valued Parameters to Stored Procedures in Entity Framework?
How to Pass Table-Valued Parameters to Stored Procedures in Entity Framework?
Jan 12, 2025 pm 10:06 PM
Entity Framework stored procedure table-valued parameters
Entity Framework itself does not directly support passing table-valued parameters to stored procedures. However, a workaround can be implemented using the ObjectContext method of ExecuteStoreQuery .
In the above code, there is a common ExecuteStoredProcedure method in the repository:
public IEnumerable<T> ExecuteStoredProcedure<T>(string procedureName, params object[] parameters)
{
StringBuilder command = new StringBuilder();
command.Append("EXEC ");
command.Append(procedureName);
command.Append(" ");
// 為每個傳入的參數(shù)添加占位符
for (int i = 0; i < parameters.Length; i++)
{
if (i > 0)
command.Append(",");
command.Append("{" + i + "}");
}
return this.context.ExecuteStoreQuery<T>(command.ToString(), parameters);
}
When passing table-valued parameters using this method, you may get errors such as "Table type parameter p6 must have a valid type name". To resolve this issue, you must specify SqlDbType as Structured and set SqlParameter.TypeName to the name of the user-defined type (UDT) in the database.
However, even with these modifications, you may still encounter errors related to invalid syntax.
Custom extension method
A custom extension method of theObjectContext class can simplify this process:
public static void ExecuteStoredProcedure(this ObjectContext context, string storedProcName, params object[] parameters)
{
string command = "EXEC " + storedProcName + " @caseid, @userid, @warnings";
context.ExecuteStoreCommand(command, parameters);
}
This extension method allows you to call stored procedures directly with table-valued parameters. Example usage is as follows:
var entities = new NewBusinessEntities();
var dt = new DataTable();
dt.Columns.Add("WarningCode");
dt.Columns.Add("StatusID");
dt.Columns.Add("DecisionID");
dt.Columns.Add("Criticality");
dt.Rows.Add("EO01", 9, 4, 0);
dt.Rows.Add("EO00", 9, 4, 0);
dt.Rows.Add("EO02", 9, 4, 0);
var caseId = new SqlParameter("caseid", SqlDbType.Int);
caseId.Value = 1;
var userId = new SqlParameter("userid", SqlDbType.UniqueIdentifier);
userId.Value = Guid.Parse("846454D9-DE72-4EF4-ABE2-16EC3710EA0F");
var warnings = new SqlParameter("warnings", SqlDbType.Structured);
warnings.Value = dt;
warnings.TypeName = "dbo.udt_Warnings";
entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);
Restrictions
When using this extension method or similar custom methods, please consider the following limitations:
- Stored procedure parameters must be in order and correspond to the parameters passed to the extension method.
- All columns in the UDT must be specified, even if they have default values.
The above is the detailed content of How to Pass Table-Valued Parameters to Stored Procedures in Entity Framework?. For more information, please follow other related articles on the PHP Chinese website!
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