从 C# Web 服务调用 PL/SQL 存储过程的 ORA 00936 错误

Question

我需要一些帮助来调用一个存储过程，该存储过程旨在将序列号添加到由 Api POST 方法添加的每一行。

目前我收到此错误消息：“ExceptionMessage”：“ORA-20001：获取下一个序列失败.. -936 ORA-00936：缺少表达式\nORA-06512：在 \"FOO_BAR.PROC_NEXT_SEQUENCE\"，行19\nORA-06512：在第 1 行"

我已经尝试过这里和其他地方的问题中建议的许多代码更改，但由于我缺乏 c#/Oracle 特定知识，我开始觉得自己好像在兜圈子。

该过程已在 SQL Developer 中成功测试。

我正在使用 VS2013（更新 5）、Entity Framework v6.1.3、ODPnet via Nuget、Oracle 11.2 和 Postman。

存储过程

PROCEDURE PROC_NEXT_SEQUENCE(
p_owner varchar2,
p_table varchar2,
p_seq_name varchar2,
p_seq_value out number)
AS
v_sql varchar2(4000) ; v_seq_value number :=0;
BEGIN 
if length(p_seq_name) >0 then v_sql := 'select '||p_owner||'.'||p_seq_name||'.nextval from dual';
else v_sql := 'select '||p_owner||'.'||p_table||'_seq.nextval from dual';
end if;
execute immediate v_sql into v_seq_value; p_seq_value := v_seq_value;
exception when others then raise_application_error(-20001, 'Get Next Sequence Failed.. '||sqlcode||' '||sqlerrm);
end;

c#

using System;
using System.Net;
using System.Data;
using System.Net.Http;
using System.Web.Http;
using System.Linq;
using System.Web.Http.Description;
using System.Collections.Generic;
using Oracle.ManagedDataAccess.Client;
using FooBarApi.Models;

    // POST: api/Location
    [HttpPost]
    [ResponseType(typeof(LOCATION))]
    [Route("", Name = "AddLocation")]
    public HttpResponseMessage AddLocation([FromBody]LOCATION Location)
    {
        // Access config file and connect to database
        OracleConnection conn = new OracleConnection("User Id=FOO_BAR; Password=foo_bar; Data Source=FOOBARTEST");

        // Setup call to stored procedure 
        OracleCommand cmd = new OracleCommand();
        cmd.Connection = conn;
        cmd.CommandText = "PROC_NEXT_SEQUENCE";
        cmd.CommandType = System.Data.CommandType.StoredProcedure;

        // Assign parameters
        cmd.Parameters.Add("p_owner", OracleDbType.Varchar2);
        cmd.Parameters.Add("p_table", OracleDbType.Varchar2);
        cmd.Parameters.Add("p_seq_name", OracleDbType.Varchar2);
        cmd.Parameters.Add("p_seq_value", OracleDbType.Decimal).Direction = ParameterDirection.Output;

        // Execute stored procedure
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();

        db.LOCATIONS.Add(Location);
        db.SaveChanges();

        var response = Request.CreateResponse<LOCATION>(HttpStatusCode.Created, Location);

        string uri = Url.Link("GetLocations", new { LOSEQ = Location.LOSEQ });
        response.Headers.Location = new Uri(uri);
        return response;

    }

LocationModel.Context.cs

namespace FooBarApi.Models
{
using System;
using System.Linq;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Data.Entity.Core.Objects;

public partial class LocationEntities : DbContext
{
    public LocationEntities()
        : base("name=LocationEntities")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<LOCATION> LOCATIONS { get; set; }

    public virtual Decimal PROC_NEXT_SEQUENCE(string p_OWNER, string p_TABLE, string p_SEQ_NAME, ObjectParameter p_SEQ_VALUE)
    {
        var p_OWNERParameter = p_OWNER != null ?
            new ObjectParameter("P_OWNER", p_OWNER) :
            new ObjectParameter("P_OWNER", typeof(string));

        var p_TABLEParameter = p_TABLE != null ?
            new ObjectParameter("P_TABLE", p_TABLE) :
            new ObjectParameter("P_TABLE", typeof(string));

        var p_SEQ_NAMEParameter = p_SEQ_NAME != null ?
            new ObjectParameter("P_SEQ_NAME", p_SEQ_NAME) :
            new ObjectParameter("P_SEQ_NAME", typeof(string));

        return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction("PROC_NEXT_SEQUENCE", p_OWNERParameter, p_TABLEParameter, p_SEQ_NAMEParameter, p_SEQ_VALUE);
    }
  }
}

错误信息

"Message": "An error has occurred.",

"ExceptionMessage": "ORA-20001: Get Next Sequence Failed.. -936 ORA-00936: missing expression\nORA-06512: at \"FOO_BAR.PROC_NEXT_SEQUENCE\", line 19\nORA-06512: at line 1",

"ExceptionType": "Oracle.ManagedDataAccess.Client.OracleException",

"StackTrace": "

at OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution(OracleConnectionImpl connectionImpl, Int32& cursorId,     Boolean bThrowArrayBindRelatedErrors, OracleException& exceptionForArrayBindDML, Boolean& hasMoreRowsInDB, Boolean bFirstIterationDone)

at OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution(OracleConnectionImpl connectionImpl, Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, OracleException& exceptionForArrayBindDML, Boolean bFirstIterationDone)

at OracleInternal.ServiceObjects.OracleCommandImpl.ExecuteNonQuery(String commandText, OracleParameterCollection paramColl, CommandType commandType, OracleConnectionImpl connectionImpl, Int32 longFetchSize, Int64 clientInitialLOBFS, OracleDependencyImpl orclDependencyImpl, Int64[]& scnFromExecution, OracleParameterCollection& bindByPositionParamColl, Boolean& bBindParamPresent, OracleException& exceptionForArrayBindDML, Boolean isFromEF)

at Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteNonQuery()

at FooBarApi.Controllers.LocationController.PostLocation(LOCATION Location) in     c:\\mvcApps\\FooBarApi\\FooBarApi\\Controllers\\LocationController.cs:line 71

at lambda_method(Closure , Object , Object[] )

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}

更新

我更新了我的代码以反映 Gary Myers 和 Aisha 发现的错误。我还添加了错误消息/堆栈跟踪以防万一。

提前谢谢你。

Answer 1

错字/所有者：

cmd.Parameters.Add("p_onwer", OracleDbType.Varchar2);

Answer 2

试试这个 SP，在 SELECT 语句后有一个空格：

PROCEDURE PROC_NEXT_SEQUENCE(
p_owner varchar2,
p_table varchar2,
p_seq_name varchar2,
p_seq_value out number)
AS
v_sql varchar2(4000) ; v_seq_value number :=0;
BEGIN 
if length(p_seq_name) >0 then v_sql := 'select '||p_owner||'.'||p_seq_name||'.nextval from dual';
else v_sql := 'select '||p_owner||'.'||p_table||'_seq.nextval from dual';
end if;
execute immediate v_sql into v_seq_value; p_seq_value := v_seq_value;
exception when others then raise_application_error(-20001, 'Get Next Sequence Failed.. '||sqlcode||' '||sqlerrm);
end;