GetDataReader(CommandBehavior) Method
Gets an
PgSqlDataReader for the specified cursor.
This example demonstrates usage of
PgSqlCursor class. To execute this code you have to create the following function on the server:
CREATE OR REPLACE FUNCTION refcursorfunc(OUT p refcursor) AS
$BODY$
DECLARE
v_refcursor refcursor;
BEGIN
OPEN v_refcursor FOR SELECT deptno FROM dept;
p := v_refcursor;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
PgSqlCommand cmd = new PgSqlCommand("refcursorfunc");
cmd.Connection = myConnection;
cmd.CommandType = CommandType.StoredProcedure;
cmd.ParameterCheck = true;
myConnection.Open();
PgSqlTransaction t = myConnection.BeginTransaction();
try {
cmd.ExecuteNonQuery();
PgSqlCursor cursor = cmd.Parameters["p"].PgSqlValue as PgSqlCursor;
using (PgSqlDataReader rd = cursor.GetDataReader()) {
while (rd.Read())
Console.WriteLine(rd.GetValue(0));
}
}
finally {
t.Commit();
myConnection.Close();
}
Dim cmd As New PgSqlCommand("refcursorfunc")
cmd.Connection = (Me.myConnection)
cmd.CommandType = CommandType.StoredProcedure
cmd.ParameterCheck = True
Me.myConnection.Open()
Dim t As PgSqlTransaction = Me.myConnection.BeginTransaction
Try
cmd.ExecuteNonQuery()
Dim cursor As PgSqlCursor = TryCast(cmd.Parameters("p").PgSqlValue, PgSqlCursor)
Using rd As PgSqlDataReader = cursor.GetDataReader
Do While rd.Read
Console.WriteLine(rd.GetValue(0))
Loop
End Using
Finally
t.Commit()
Me.myConnection.Close()
End Try
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2