c＃中的Postgresql Npgsql.PostgresException

Question

我有cmd.ExecuteReader（）的問題我得到一個Npgsql.PostgresException

    public void connectDB()
    {
        try
        {
            server = "localhost";
            database = "DoveVer3";
            uid = "admin";
            password = "admin";
            string connectionString;
            connectionString = "Host=" + server + ";Username =" + uid + ";" + "PASSWORD=" + password + ";DATABASE=" + database;

            connection.ConnectionString = connectionString;
            connection.Open();

        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message);

        }


    }

我在下面的代碼中獲得了Exeption：

  public void AddDoveToDB(Dove dove)
    {
        //add new dove record to tableDB
        connectDB();
        cmd = new NpgsqlCommand();
        cmd.Connection = connection;
        cmd.CommandText = "SELECT * FROM " + DoveTableDB + " WHERE `" + DoveIdColumnDoveTable + "` = '" + dove.GetDoveId() + "'";
        NpgsqlDataReader rdr = cmd.ExecuteReader(); //// <<<<< HERE
        if (rdr.Read() != true)
        {
            rdr.Close();
            cmd.Parameters.Clear();

            cmd.CommandText = "INSERT INTO " + DoveTableDB + "(" + DoveIdColumnDoveTable + "," + DoveIdFatherColumnDoveTable + "," + DoveIdMotherColumnDoveTable + "," + DoveEyesColorColumnDoveTable + "," + DoveFeatherColorDoveTable + "," + DoveImageNameColumnDoveTable + "," + DoveSexColumnDoveTable +") VALUES ('" + dove.GetDoveId() + "','" + dove.GetDoveFatherId() + "','" + dove.GetDoveMotherId() + "','" + dove.GetEyesColor() + "','" + dove.GetFeathersColor()+ "','" + dove.GetImageName() + "','" + dove.GetSex()+ "')";
            cmd.ExecuteNonQuery();

        }
        connection.Close();
    }

我的數據庫名為DoveVer3，我的架構DoveSchema在這里是我的表代碼：

    Name: DoveTable; Type: TABLE; Schema: DoveSchema; Owner: admin
--

CREATE TABLE "DoveTable" (
    "doveId" character varying(20)[] NOT NULL,
    "doveFather" character varying(20)[],
    "doveMother" character varying,
    "doveEyesColor" character varying(20)[],
    "doveFeathersColor" character varying(20)[],
    "doveSex" smallint DEFAULT 3 NOT NULL,
    "imageName" character varying(30)
);
ALTER TABLE "DoveTable" OWNER TO admin;

例外基礎信息：

關系“dovetable”不存在; Statemants：{SELECT * FROM DoveTable WHERE doveId ='Test'}

Answer 1

默認情況下，傳遞給PostgreSQL的所有標識符都將被視為小寫。 根據您的創建腳本，在定義表時使用了quoted-identifer ，因此在使用表名時需要以下內容。

SELECT * FROM "DoveTable"

請注意，它用雙引號括起來，'D'和'T'都是大寫的。 使用帶引號的標識符時，必須始終按照定義它們的方式將它們寫出來。