如何回收我的SqliteCommand来加速这个Sqlite批量插入（iOS）？

我正在使用下面的代码批量插入30000行（一次1000行）。 它仍然没有那么快。 在这个例子中提高了SQLite的每秒INSERT性能？ 我可以看到他们只创建了一次SqliteCommand，然后重新循环它重置它并清除绑定。 但是，我在iOS / Monotouch上找不到合适的方法。 没有Reset()或ClearBindings()或其他类似的东西。

 using ( var oConn = new SqliteConnection ( "Data Source=" + DB_NAME ) ) { oConn.Open ( ); // Wrap the whole bulk insertion into one block to make it faster, otherwise one transaction per INSERT would be created. // Note that this is differen from "BEGIN TRANSACTION" which would increase memory usage a lot! SqliteCommand oCmd = new SqliteCommand ( "BEGIN", oConn ); oCmd.ExecuteNonQuery ( ); oCmd.Dispose ( ); foreach ( MyObj oObj in aMyObjects ) { oCmd = new SqliteCommand ( "INSERT INTO LocalObjects ( intID, intParentID, intObjectType, strName, dtModified VALUES (@intID, @intParentID, @intObjectType, @strName, @dtModified)", oConn ); oCmd.Parameters.AddWithValue ( "@intID", oMyObj.ID ); oCmd.Parameters.AddWithValue ( "@intParentID", oMyObj.ParentID ); oCmd.Parameters.AddWithValue ( "@intObjectType", ( int ) oMyObj.Type ); oCmd.Parameters.AddWithValue ( "@strName", oMyObj.Name ); oCmd.Parameters.AddWithValue ( "@dtModified", oMyObj.Modified ); oCmd.ExecuteNonQuery ( ); oCmd.Dispose ( ); } oCmd = new SqliteCommand ( "END", oConn ); oCmd.ExecuteNonQuery ( ); oCmd.Dispose ( ); oConn.Close ( ); oConn.Dispose ( ); } 

Answer 1

尝试将您的代码更改为以下内容：

 using ( var oConn = new SqliteConnection ( "Data Source=" + DB_NAME ) ) { oConn.Open ( ); // Wrap the whole bulk insertion into one block to make it faster, otherwise one transaction per INSERT would be created. // Note that this is differen from "BEGIN TRANSACTION" which would increase memory usage a lot! SqliteCommand oCmd = new SqliteCommand ( "BEGIN", oConn ); oCmd.ExecuteNonQuery ( ); oCmd.Dispose ( ); oCmd = new SqliteCommand ( "INSERT INTO LocalObjects ( intID, intParentID, intObjectType, strName, dtModified VALUES (@intID, @intParentID, @intObjectType, @strName, @dtModified)", oConn ); // . var id = oCmd.CreateParameter(); id.ParameterName = "@intID"; oCmd.Parameters.Add(id); // . foreach ( MyObj oObj in aMyObjects ) { // . id.Value = oMyObj.ID; // . oCmd.ExecuteNonQuery ( ); } oCmd.Dispose(); oCmd = new SqliteCommand ( "END", oConn ); oCmd.ExecuteNonQuery ( ); oCmd.Dispose ( ); oConn.Close ( ); oConn.Dispose ( ); } 

基本上，在每个循环中，您现在只需更改参数的值，而不是构造一个全新的查询。 但是，我不确定，您的表现是否真的会从中受益。 你需要尝试一下。

Answer 2

您还可以尝试使用存储过程来插入行。 它应该比内联语句更快，特别是插入这么多行。