并非所有变量都绑定 Oracle REST Web API

Question

我得到 Not all variables Bound.

这是我的代码的样子。

public IEnumerable<VaultService> Get(string Branch_Desg)
{
    OracleConnection con = new OracleConnection(constr);
    con.Open();
    DataTable dt = new DataTable();
    //string sql = "select * from wemadummyvaulttable where branch_desg = " + Branch_Desg + "";
    string sql = "select BRANCH_ID ,BRANCH_NAME ,BRANCHID_NUMBER ,BRANCH_ACCOUNTNO ,BRANCH_DESG ,CURRENCY ,BRANCH_BALANCE from wemadummyvaulttable where Branch_Desg =" + ":Branch_Desg";

  OracleDataAdapter da = new OracleDataAdapter(sql, con);
    da.Fill(dt);
    List<VaultService> vr = new List<Models.VaultService>(dt.Rows.Count);
    if (dt.Rows.Count > 0)
    {
        foreach (DataRow vaultrecord in dt.Rows)
        {
            vr.Add(new ReadVaultBal(vaultrecord));
        }
    }
    return vr;
}

由于某种原因，它无法正常工作。

截图如下：

现在我的更新代码如下所示：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using WEMAVaultREST.Models;
using Oracle.ManagedDataAccess.Client;
using Oracle.ManagedDataAccess.Types;
using System.Data;

namespace WEMAVaultREST.Controllers
{
    public class VaultServiceController : ApiController
    {
        string constr = "User ID=system; Password=admin1234; Data Source=SAM;";
        // GET api/<controller>
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }

        // GET api/<controller>/5
        public string Get(int id)
        {
            return "value";
        }

        // GET api/<controller>/5
        /* public VaultService Get(string Branch_Desg)
         {
             OracleConnection con = new OracleConnection(constr);
             con.Open();
             DataTable dt = new DataTable();

             string sql = "select * from wemadummyvaulttable where branch_desg = '"+Branch_Desg+"'";
             OracleDataAdapter da = new OracleDataAdapter(sql,con);
             da.Fill(dt);
             if (dt.Rows.Count > 0)
             {
                 return new ReadVaultBal(dt.Rows[0]);
             }
             throw new Exception("Account not found");
         }*/

        public IEnumerable<VaultService> Get(string Branch_Desg)
        {
            OracleConnection con = new OracleConnection(constr);
            con.Open();
            DataTable dt = new DataTable();
            //string sql = "select * from wemadummyvaulttable where branch_desg = " + Branch_Desg + "";
            string sql = "select BRANCH_ID ,BRANCH_NAME ,BRANCHID_NUMBER ,BRANCH_ACCOUNTNO ,BRANCH_DESG ,CURRENCY ,BRANCH_BALANCE from wemadummyvaulttable where Branch_Desg =" + ":Branch_Desg";

            var command = new OracleCommand(sql, con);
            command.Parameters.Add("Branch_Desg", Branch_Desg);
            OracleDataAdapter da = new OracleDataAdapter(command);
            da.Fill(dt);
            List<VaultService> vr = new List<Models.VaultService>(dt.Rows.Count);
            if (dt.Rows.Count > 0)
            {
                foreach (DataRow vaultrecord in dt.Rows)
                {
                    vr.Add(new ReadVaultBal(vaultrecord));
                }
            }
            return vr;
        }


        // POST api/<controller>
        public void Post([FromBody]string value)
        {
        }

        // PUT api/<controller>/5
        public void Put(int id, [FromBody]string value)
        {
        }

        // DELETE api/<controller>/5
        public void Delete(int id)
        {
        }
    }
}

这就是我现在所拥有的。如您所见，它在 Sqldeveloper 中返回。在代码中，它没有。我不知道从这里到哪里去。

如果我像这样运行 REST api：

http://localhost:7177/api/VaultService?Branch_Desg=Branch01

它返回这个

Answer 1

换行试试

 OracleDataAdapter da = new OracleDataAdapter(sql, con);

与

 var command = new OracleCommand(sql, con);
    command.Parameters.Add("Branch_Desg", branchDesg);
    OracleDataAdapter da = new OracleDataAdapter(command);

似乎没有办法直接将绑定参数添加到OracleDataAdapter，所以我们必须先从SQL字符串创建一个OracleCommand，为参数:Branch_Desg添加一个值，然后创建来自命令的适配器。

最后，我能否建议所有 Oracle 资源（连接、命令和数据适配器）都被正确处理，通过在 using 块中创建它们，例如

使用 (OracleConnection con = new OracleConnection(constr))
{
    // 使用数据库连接'con'的代码
}