Question

我有一个返回refcursor的过程

TYPE TEST_LIST IS REF CURSOR;
Procedure TestProcedure (Id IN NUMBER, Result OUT TEST_LIST)
    IS 
    BEGIN
    OPEN Result
    FOR
    SELECT distinct o.paramNumber, o.paramVArchar
    FROM testBD o
    WHERE o.id = Id;    
    CLOSE Result;
    END TestProcedure;

然后是DataTable的类。

public class TestList
{
    public long ParamNumber { get; set; }
    public string ParamVarchar { get; set; }

}

执行该过程的方法，然后将DataTable导入列表，将其转换为json-string：

public string GetResult(long id)
{
    using (var connection = new OracleConnection())
    {
        connection.ConnectionString = ConfigurationManager.ConnectionStrings["Test"].ConnectionString;
        using (var command = connection.CreateCommand())
        {

            command.CommandType = CommandType.StoredProcedure;
            command.CommandText = $"{PackageName}.TestProcedure";
            parameter.Add("Id", OracleDbType.Long).Value = Id;
            command.Parameters.Add("Result", OracleDbType.RefCursor).Direction = ParameterDirection.Output;
            OracleDataAdapter da = new OracleDataAdapter(command);
            ////creating and filling datatable
            DataTable dt = new DataTable();
            connection.Open();
            da.Fill(dt);
            connection.Close();
            //creating a serializer
            System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
            //creating a dictionary list
            List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
            Dictionary<string, object> row;
            //filling list with datatable rows
            foreach (DataRow dr in dt.Rows)
            {
                row = new Dictionary<string, object>();
                foreach (DataColumn col in dt.Columns)
                {
                    row.Add(col.ColumnName, dr[col]);
                }
                rows.Add(row);
            }
            //returning a serialized string out of list
            return serializer.Serialize(rows);

        }

    }
}

最后我有一个带有get请求的控制器

public string Get(long id)
{
    return TestClass.GetResult(id);
}

我从中得到了一些错误。我需要从ref光标中获取json中的字符串或列表。也许有一种更简单的方法可以做到这一点？或者我在这里做错了什么？

Answer 1

将参数作为参数传出时，请勿关闭存储过程中的光标。它立即关闭，WebAPI无法处理。您的using语句可确保在处理连接时光标关闭，因为光标在没有连接的情况下无法生存。

Answer 2

实现这一目标的方法是

Result = from row in dt.AsEnumerable()
                                             select new
                                             {
                                                 param1 = (string)row["PARAMNUMBER"],
                                                 param2 = (string)row["PARAMVARCHAR"]
                                             };
 string json = JsonConvert.SerializeObject(Result, Formatting.None);

让webapi从refcursor获取请求

2 个答案: