Yep, there are questions here and here about how to insert records with dapper-dot-net. However, the answers, while informative, didn't seem to point me in the right direction. Here is the situation: moving data from SqlServer to MySql. Reading the records into an IEnumerable<WTUser>
is easy, but I am just not getting something on the insert. First, the 'moving records code':
// moving data
Dim session As New Session(DataProvider.MSSql, "server", _
"database")
Dim resources As List(Of WTUser) = session.QueryReader(Of WTUser)("select * from tbl_resource")
session = New Session(DataProvider.MySql, "server", "database", _
"user", "p@$$w0rd")
// *edit* - corrected parameter notation with '@'
Dim strInsert = "INSERT INTO tbl_resource (ResourceName, ResourceRate, ResourceTypeID, ActiveYN) " & _
"VALUES (@ResourceName, @ResourceRate, @ResourceType, @ActiveYN)"
Dim recordCount = session.WriteData(Of WTUser)(strInsert, resources)
// session Methods
Public Function QueryReader(Of TEntity As {Class, New})(ByVal Command As String) _
As IEnumerable(Of TEntity)
Dim list As IEnumerable(Of TEntity)
Dim cnn As IDbConnection = dataAgent.NewConnection
list = cnn.Query(Of TEntity)(Command, Nothing, Nothing, True, 0, CommandType.Text).ToList()
Return list
End Function
Public Function WriteData(Of TEntity As {Class, New})(ByVal Command As String, ByVal Entities As IEnumerable(Of TEntity)) _
As Integer
Dim cnn As IDbConnection = dataAgent.NewConnection
// *edit* if I do this I get the correct properties, but no data inserted
//Return cnn.Execute(Command, New TEntity(), Nothing, 15, CommandType.Text)
// original Return statement
Return cnn.Execute(Command, Entities, Nothing, 15, CommandType.Text)
End Function
cnn.Query and cnn.Execute call the dapper extension methods. Now, the WTUser class (note: the column name changed from 'WindowsName' in SqlServer to 'ResourceName' in MySql, thus the two properties pointing to the same field):
Public Class WTUser
// edited for brevity - assume the following all have public get/set methods
Public ActiveYN As String
Public ResourceID As Integer
Public ResourceRate As Integer
Public ResourceType As Integer
Public WindowsName As String
Public ResourceName As String
End Class
I am receiving an exception from dapper: "WTUser is not supported by Dapper." This method in DataMapper (dapper):
private static Action<IDbCommand, object> CreateParamInfoGenerator(Type OwnerType)
{
string dmName = string.Format("ParamInfo{0}", Guid.NewGuid());
Type[] objTypes = new[] { typeof(IDbCommand), typeof(object) };
var dm = new DynamicMethod(dmName, null, objTypes, OwnerType, true); // << - here
// emit stuff
// dm is instanced, now ...
foreach (var prop in OwnerType.GetProperties().OrderBy(p => p.Name))
At this point OwnerType =
System.Collections.Generic.List`1[[CRMBackEnd.WTUser,
CRMBE, Version=1.0.0.0,
Culture=neutral,
PublicKeyToken=null]], mscorlib,
Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089
It seems like OwnerType should be CRMBackEnd.WTUser
... not List<CRMBackEnd.WTUser>
... ??? because what is happening is that the collection properties are being iterated: Count, Capacity, etc. What am I missing?
Update
If I modified session.WriteData as:
Public Function WriteData(Of TEntity As {Class, New})(ByVal Command As String, _
ByVal Entities As IEnumerable(Of TEntity)) _
As Integer
Dim cnn As IDbConnection = dataAgent.NewConnection
Dim records As Integer
For Each entity As TEntity In Entities
records += cnn.Execute(Command, entity, Nothing, 15, CommandType.Text)
Next
Return records
End Function
records are inserted nicely ... but I didn't think this would be necessary given examples like:
connection.Execute(@"insert MyTable(colA, colB) values (@a, @b)",
new[] { new { a=1, b=1 }, new { a=2, b=2 }, new { a=3, b=3 } }
).IsEqualTo(3); // 3 rows inserted: "1,1", "2,2" and "3,3"
... from dapper-dot-net
See Question&Answers more detail:
os