[英]Using Dapper with Oracle User-Defined Types
Is there a way to use Dapper with Oracle User-Defined Types returned by stored procedures? 有没有办法将Dapper与存储过程返回的Oracle用户定义类型一起使用? Dapper seems to work with stored procedures (see Using Dapper with Oracle stored procedures which return cursors ).
Dapper似乎可以与存储过程一起使用 (请参阅将Dapper与返回游标的Oracle存储过程一起使用 )。
var p = new OracleDynamicParameters();
p.Add("param_list", null, OracleDbType.Object, ParameterDirection.Output);
p.Add("param_reco", null, OracleDbType.Object, ParameterDirection.Output);
In my example I've added a UDT collection object as output parameter ( param_list
). 在我的示例中,我添加了一个UDT集合对象作为输出参数(
param_list
)。 I'm using the custom OracleDynamicParameters
posted in Dapper – Micro ORM for Oracle and Microsoft .NET . 我正在使用Dapper –适用于Oracle和Microsoft .NET的Micro ORM中发布的自定义
OracleDynamicParameters
。
The more I read ORM related stuff, the more I see Oracle UDT objects as an obstacle. 我阅读与ORM相关的内容越多,就越将Oracle UDT对象视为障碍。 In this case plain ADO.NET and generated C# entity classes seem to be the only way to go.
在这种情况下,简单的ADO.NET和生成的C#实体类似乎是唯一的方法。 Maybe automapper.org might be useful for mapping domain objects to UDT objects.
也许automapper.org对于将域对象映射到UDT对象可能有用。
Look into using OracleCustomTypeMapping attribute and the OracleObjectMapping attribute. 研究使用OracleCustomTypeMapping属性和OracleObjectMapping属性。 Can't recall where I got this idea from but...
我不记得我从哪里得到这个主意,但是...
public interface INullableOracleCustomType: INullable, IOracleCustomType
{
}
[OracleCustomTypeMapping("<YOUR_SCHEMA_NAME>.<UDT_OBJECT_NAME>")]
public class ParameterObject : INullableOracleCustomType
{
private bool objectIsNull;
#region constructor
public ParameterObject()
{ }
public ParameterObject(string parameterName, string parameterValue)
{
this.ParameterName = parameterName;
this.ParameterValue = parameterValue;
}
#endregion
#region properties
[OracleObjectMappingAttribute("PARAMETERNAME")]
public string ParameterName { get; set; }
[OracleObjectMappingAttribute("PARAMETERVALUE")]
public string ParameterValue { get; set; }
public static ParameterObject Null
{
get
{
ParameterObject parameterObject = new ParameterObject();
parameterObject.objectIsNull = true;
return parameterObject;
}
}
#endregion
#region INullable Members
public bool IsNull
{
get { return objectIsNull; }
}
#endregion
#region IOracleCustomType
public void FromCustomObject(Oracle.DataAccess.Client.OracleConnection con, IntPtr pUdt)
{
// Convert from the Custom Type to Oracle Object
if (!string.IsNullOrEmpty(ParameterName))
{
OracleUdt.SetValue(con, pUdt, "PARAMETERNAME", ParameterName);
}
if (!string.IsNullOrEmpty(ParameterValue))
{
OracleUdt.SetValue(con, pUdt, "PARAMETERVALUE", ParameterValue);
}
}
public void ToCustomObject(Oracle.DataAccess.Client.OracleConnection con, IntPtr pUdt)
{
ParameterName = (string)OracleUdt.GetValue(con, pUdt, "PARAMETERNAME");
ParameterValue = (string)OracleUdt.GetValue(con, pUdt, "PARAMETERVALUE");
}
#endregion
}
example usage ... 用法示例...
public static OracleParameter CreateCustomTypeArrayInputParameter<T>(string name, string oracleUDTName, T value)
where T : INullableOracleCustomType
{
OracleParameter parameter = new OracleParameter();
parameter.ParameterName = name;
parameter.OracleDbType = OracleDbType.Array;
parameter.Direction = ParameterDirection.Input;
parameter.UdtTypeName = oracleUDTName;
parameter.Value = value;
return parameter;
}
Oracle seems fussy about the schema/type/object names being in ALLCAPS Oracle似乎对ALLCAPS中的模式/类型/对象名称很挑剔
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