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[英]String was not recognized as valid Datetime after converting Db from MSSQL to SQLite
[英]Converting string from MSSQL to MySQL
我有一個正在從SQL DB讀取並寫入MySQL的應用程序。 該應用程序用於為客戶端遷移數據。 在測試時,我遇到一個記錄問題,並且感到很困惑。 我已經使用C# Encoding
類測試了該站點的各種建議,並且每次都嘗試對它進行轉換,但都沒有成功。
該SQL排序規則是SQL_Latin1_General_CP1_CI_AS
MySQL的核對是latin1_general_ci
的代碼(在一個樣品foreach
循環)如下:
foreach(var pgObj in PgObjList)
{
//byte[] bytes = Encoding.Default.GetBytes(pgObj.Description);
//pgObj.Description = Encoding.ASCII.GetString(bytes);
byte[] utf8Bytes = Encoding.UTF8.GetBytes(pgObj.Description);
byte[] isoBytes = Encoding.Convert(Encoding.ASCII, Encoding.UTF8, utf8Bytes);
string uf8converted = Encoding.UTF8.GetString(isoBytes);
string insertSQL = @"INSERT INTO `mainsite`.`sf_root_items`
(`ID`,
`LoweredName`,
`MenuName`,
`Title`,
`Description`,
`PageType`,
`ExternalUrl`
)
VALUES
('" + pgObj.ID + @"',
'" + pgObj.LoweredName + @"',
'" + pgObj.MenuName + @"',
'" + pgObj.Title + @"',
'" + pgObj.Description + @"',
'" + pgObj.PageType + @"',
'" + pgObj.ExternalUrl + @"'
);";
string outputMsg;
// more code here to execute the MySQL statement
}
我得到的最好結果是轉換為ASCII碼(帶注釋的代碼),並將文本存儲在看起來像漢字的位置。 沒有異常,但是當我以任何其他方式運行它時,此記錄將導致異常。
例外:
MySQL Exception on record#28/r/n
MySql.Data.MySqlClient.MySqlException (0x80004005): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'il vous plaît (RSVP)',
'0',
' at line 15
at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
at SharepointImportDL.SharepointContentImport.GetSitefinityContent.addRootItems(List`1 PgObjList, String WPConnectionString) in C:\Users\Administrator\Source\Repos\TestBinaryWriter\Test Binary Writer\SharepointImportDL\SharepointContentImport\GetSitefinityContent.cs:line 986
第986行是SQL執行: int output = cmd.ExecuteNonQuery();
可能還值得注意的是,我要插入的字符串來自nvarchar列(MSSQL)和varchar(MySQL)列
具有諷刺意味的是,該字符串是一個簡單的“Répondezs'il vousplaît(RSVP)” (我想打招要使用法語文本的自命不凡的人),因此不太可能再次遇到它,但顯然我需要處理這種可能性。
逃逸字符串(例如, pgObj.Description
構建SQL(前) string insertSQL
)。 否則您會從類似的東西中得到語法錯誤
, 'Répondez s'il vous plaît (RSVP)',
請注意在單引號內如何有一個單引號? 還要注意錯誤是如何指出問題的:
... syntax to use near 'il vous plaît (RSVP)',
感謝Palle Due建議使用參數化查詢,我決定在MySQL中編寫一個存儲過程來處理這些問題。
基於我的原始問題,我的C#代碼如下:
foreach(var pgObj in PgObjList)
{
string SP = "sp_insert_root_items";
string outputMsg = "";
MySqlConnection myConnection = new MySqlConnection(WPConnectionString);
MySqlCommand cmd;
try
{
if (myConnection.State != ConnectionState.Open)
{
myConnection.Close();
myConnection.Open();
}
cmd = myConnection.CreateCommand();
cmd.CommandText = SP;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@ID", pgObj.ID);
cmd.Parameters["@ID"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@LoweredName", pgObj.LoweredName);
cmd.Parameters["@LoweredName"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@MenuName", pgObj.MenuName);
cmd.Parameters["@MenuName"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@Title", pgObj.Title);
cmd.Parameters["@Title"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@Description", pgObj.Description);
cmd.Parameters["@Description"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@PageType", pgObj.PageType);
cmd.Parameters["@PageType"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@ExternalUrl", pgObj.ExternalUrl);
cmd.Parameters["@ExternalUrl"].Direction = ParameterDirection.Input;
cmd.Parameters.AddWithValue("@ParentID", "");
cmd.Parameters["@ParentID"].Direction = ParameterDirection.Input;
int output = cmd.ExecuteNonQuery();
// a value greater than 0 means execution was successful
if (output > 0)
{
counter++;
//outputMsg = "Record #" + counter.ToString() + " created";
}
else
{
counter++;
outputMsg = "There was an error inserting record #" + counter.ToString();
}
myConnection.Close();
}
catch (Exception ex)
{
outputMsg = "MySQL Exception on record#" + counter.ToString() + "/r/n" + ex.ToString();
}
returnMsg += outputMsg;
}
下面是存儲過程的一個示例-它是從SQLYog導出的。
DELIMITER $$
/*!50003 CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_insert_root_items`(
IN ID VARCHAR(255),
IN LoweredName VARCHAR(255),
IN MenuName VARCHAR(255),
IN Title VARCHAR(255),
IN Description VARCHAR(500),
IN PageType VARCHAR(255),
IN ExternalUrl VARCHAR(255),
IN ParentID VARCHAR(255)
)
BEGIN
INSERT INTO `wp_sf_page_items`
(`ID`,
`LoweredName`,
`MenuName`,
`Title`,
`Description`,
`PageType`,
`ExternalUrl`,
`ParentID`
)
VALUES(ID, LoweredName, MenuName, Title, Description, PageType, ExternalUrl, ParentID);
END */$$
DELIMITER ;
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