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ユーザーテーブルに参加してユーザーのログイン名を取得しようとしています。2つのINNERを1つに参加させCreatedByUser_loginnameたいModifiedByUser_loginname

しかし、現時点では、SQLクエリ文字列の構文を正しく取得しようとしています。ただし、INNERJOINの名前をAS'name'に変更すると、sqlreader（）メソッドの実行時に例外がスローされます。ASを削除すると...動作しますが、同じUserテーブルに2番目のINNER JOINを追加して、modifiedbyuserログイン名の名前を取得できません。

これが問題のあるコードです

これは機能しません

String sqlComStr = "SELECT Company_ID, Company_Name, Company_Address1, Company_Address2, Company_Address3, Company_Suburb, Company_City, " +
    "Company_State, Company_PostCode, Company_Phone, Company_Fax, Company_WebsiteUrl, Company_Status, Company_ModifiedByUser_ID, Company_CreatedByUser_ID, " +
    " [U1].User_LoginName " +
    "FROM Company INNER JOIN [User] AS U1 ON [User].User_ID = [Company].Company_CreatedByUser_ID WHERE [Company].isDeleted = 0" + companyFilter;

これはします

String sqlComStr = "SELECT Company_ID, Company_Name, Company_Address1, Company_Address2, Company_Address3, Company_Suburb, Company_City, " +
    "Company_State, Company_PostCode, Company_Phone, Company_Fax, Company_WebsiteUrl, Company_Status, Company_ModifiedByUser_ID, Company_CreatedByUser_ID, " +
    " User_LoginName " +
    "FROM Company INNER JOIN [User] ON [User].User_ID = [Company].Company_CreatedByUser_ID WHERE [Company].isDeleted = 0" + companyFilter;

...。

String sqlComStr = "SELECT Company_ID, Company_Name, Company_Address1,    Company_Address2, Company_Address3, Company_Suburb, Company_City, " +
    "Company_State, Company_PostCode, Company_Phone, Company_Fax, Company_WebsiteUrl, Company_Status, Company_ModifiedByUser_ID, Company_CreatedByUser_ID, " +
    " [U1].User_LoginName " +
    "FROM Company INNER JOIN [User] AS U1 ON [User].User_ID = [Company].Company_CreatedByUser_ID WHERE [Company].isDeleted = 0" + companyFilter;

sqlcmd.CommandText = sqlComStr;
sqlCon.ConnectionString = "Data Source='PTSSHM\\SQLEXPRESS'; Initial Catalog='PROACTIVE'; Integrated Security=True;";
//sqlCon.ConnectionString = App.appSqlConnectionString;
sqlcmd.Connection = sqlCon;

try
{
    sqlCon.Open();

    SqlDataReader sqlReader = sqlcmd.ExecuteReader(CommandBehavior.Default);
    // If no Exception thrown at this point clear the quote items
    companys.Clear();

    while (sqlReader.Read())
    // Read each row and create a new quite item object int he quoteitems list
    {
        companys.Add(new Company((int)sqlReader["Company_ID"],
            (string)sqlReader["Company_Name"].ToString(),
            (string)sqlReader["Company_Address1"].ToString(),
            (string)sqlReader["Company_Address2"].ToString(), 
            (string)sqlReader["Company_Address3"].ToString(),
            (string)sqlReader["Company_Suburb"].ToString(),
            (string)sqlReader["Company_City"].ToString(),
            (string)sqlReader["Company_State"].ToString(),       
            (string)sqlReader["Company_PostCode"].ToString(),
            (string)sqlReader["Company_Phone"].ToString(),
            (string)sqlReader["Company_Fax"].ToString(),
            (string)sqlReader["Company_WebsiteUrl"].ToString(),
            (string)sqlReader["Company_Status"].ToString(),
            (int)sqlReader["Company_ModifiedByUser_ID"],
            (int)sqlReader["Company_CreatedByUser_ID"],
            (string)sqlReader["[U1].User_LoginName"].ToString(), "d"));
    }
}
4

2 に答える 2

2

User as U1などのテーブル名にエイリアスを使用すると、その名前[user]はクエリに存在しなくなり、以降のすべての参照でU1を使用する必要があります。

INNER JOIN [User] AS U1 ON [User].User_ID = [Company].Company_CreatedByUser_ID

まだjoin句でUserを使用しています。

INNER JOIN [User] AS U1 ON U1.User_ID = [Company].Company_CreatedByUser_ID
于 2009-12-13T12:17:10.650 に答える
1

修理済み

String sqlComStr = "SELECT Company_ID, Company_Name, Company_Address1, Company_Address2, Company_Address3, Company_Suburb, Company_City, " +
            "Company_State, Company_PostCode, Company_Phone, Company_Fax, Company_WebsiteUrl, Company_Status, Company_ModifiedByUser_ID, Company_CreatedByUser_ID, " +
            " [CreateUser].User_LoginName AS CreateUser, [ModUser].User_LoginName AS ModUser  " +
            "FROM Company INNER JOIN [User] As [CreateUser] ON [CreateUser].User_ID = [Company].Company_CreatedByUser_ID INNER JOIN [User] AS [ModUser] ON [ModUser].User_ID = [Company].Company_ModifiedByUser_ID WHERE [Company].isDeleted = 0" + companyFilter;

と

companys.Add(new Company((int)sqlReader["Company_ID"], (string)sqlReader["Company_Name"].ToString(), (string)sqlReader["Company_Address1"].ToString(),
                    (string)sqlReader["Company_Address2"].ToString(), (string)sqlReader["Company_Address3"].ToString(), (string)sqlReader["Company_Suburb"].ToString(),
                    (string)sqlReader["Company_City"].ToString(), (string)sqlReader["Company_State"].ToString(), (string)sqlReader["Company_PostCode"].ToString(),
                    (string)sqlReader["Company_Phone"].ToString(), (string)sqlReader["Company_Fax"].ToString(), (string)sqlReader["Company_WebsiteUrl"].ToString(),
                    (string)sqlReader["Company_Status"].ToString(), (int)sqlReader["Company_ModifiedByUser_ID"], (int)sqlReader["Company_CreatedByUser_ID"],
                    (string)sqlReader["CreateUser"].ToString(), (string)sqlReader["ModUser"].ToString()));
于 2009-12-13T12:26:09.710 に答える