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给定这个 oracle 存储的 proc 包：

CREATE OR REPLACE 
PACKAGE TESTPKG AS 
  FUNCTION TestReturnRefCursor RETURN SYS_REFCURSOR;
  PROCEDURE TestingRefCursorsAsOutParam (outp OUT SYS_REFCURSOR);
END TESTPKG

而这个包体：

CREATE OR REPLACE
PACKAGE BODY TESTPKG AS

  FUNCTION TestReturnRefCursor RETURN SYS_REFCURSOR AS
    outp SYS_REFCURSOR;
  BEGIN
    OPEN outp FOR SELECT * FROM TABLENAME;
    RETURN outp; 
  END TestReturnRefCursor;

  PROCEDURE TestingRefCursorsAsOutParam (outp OUT SYS_REFCURSOR) AS 
  BEGIN
    OPEN outp FOR SELECT * FROM TABLENAME;
  END TestingRefCursorsAsOutParam;

END TESTPKG;

我正在尝试使用 Dapper 调用任一函数。我创建了实现 Dapper.SqlMapper.IDynamicParameters 的 OracleDynamicParameters 类，我在搜索 StackOverflow 后在这篇文章中找到了该类：https ://gist.github.com/vijaysg/3096151

使用以下代码调用 TestReturnRefCursor 存储函数可以正常工作：

        var conn = new OracleConnection(ConfigurationManager.ConnectionStrings["DataConnection"].ConnectionString);
        conn.Open();
        var p = new OracleDynamicParameters();
        p.Add("retSet", dbType: OracleDbType.RefCursor, direction: ParameterDirection.ReturnValue);
        conn.Execute("TESTPKG.TestReturnRefCursor ", param: p, commandType: CommandType.StoredProcedure);
        var refcur = p.Get<OracleRefCursor>("retSet");
        // do something with refcur
        conn.Close();

但是，当我尝试使用以下代码调用 TestingRefCursorsAsOutParam 存储过程时：

var conn = new OracleConnection(ConfigurationManager.ConnectionStrings["DataConnection"].ConnectionString);
conn.Open();
var p = new OracleDynamicParameters();
p.Add("retSet", dbType: OracleDbType.RefCursor, direction: ParameterDirection.Output);
conn.Execute("TESTPKG.TestingRefCursorsAsOutParam ", param: p, commandType: CommandType.StoredProcedure);
var refcur = p.Get<OracleRefCursor>("retSet");
// do something with refcur
conn.Close();

我从 Oracle.ManagedDataAccess.dll 得到一个 OracleException 的详细信息：

"ORA-06550: line 1, column 7:\nPLS-00306: wrong number or types of arguments in call to 'TESTINGREFCURSORSASOUTPARAM'\nORA-06550: line 1, column 7:\nPL/SQL: Statement ignored"

我在搜索另一个 stackoverflow 帖子后发现，有时参数如果为 null 则不会绑定，除非您专门将它们的值设置为 DBNull.Value，所以我尝试将添加参数行更改为：

p.Add("retSet", value: DBNull.Value, dbType: OracleDbType.RefCursor, direction: ParameterDirection.Output);

但这没有帮助。

我可以使用常规的 c# oracle 代码调用这个存储过程：

var cmd = conn.CreateCommand();
cmd.CommandText = "TESTPKG.TestingRefCursorsAsOutParam";
cmd.CommandType = CommandType.StoredProcedure;

var outparam = new OracleParameter();
outparam.ParameterName = "retSet";
outparam.Direction = ParameterDirection.Output;
outparam.OracleDbType = OracleDbType.RefCursor;

cmd.Parameters.Add(outparam);

OracleDataAdapter da = new OracleDataAdapter(cmd);
cmd.ExecuteNonQuery();

var refcur = (OracleRefCursor)cmd.Parameters[0].Value;

我在这里遗漏了什么，还是 Dapper 无法正常运行？

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1 回答 1

1

如果您不想使用 dapper 对结果使用强类型（即：）Query<YourStrongType>，您可以使用Query<dynamic>，下面的代码应该可以工作：

 IEnumerable<dynamic> results = null;
 using (var conn = new OracleConnection(ConfigurationManager.ConnectionStrings["DataConnection"].ConnectionString))
{
    var p = new OracleDynamicParameters();
    p.Add("outp ", dbType: OracleDbType.RefCursor, direction: ParameterDirection.Output);
    results = conn.Query<dynamic>("TESTPKG.TestingRefCursorsAsOutParam", p, commandType: CommandType.StoredProcedure);

    foreach (var row in results)
    {
         var fields = row as IDictionary<string, object>;
    }
}
于 2015-12-15T04:49:47.027 回答