Question

我有一个带有本地SQL CE数据库的Windows Mobile PPC，我试图在连接时将其复制到远程SQL Server数据库。我不能使用批量复制或任何其他“自动”方法，因为该平台已经过时且SQL CE有限。

我改编了一个解决方案here，但我很遗憾，因为当目标数据库为空时，该过程运行良好，但是当它具有预先存在的数据时失败（主键错误）。所以DataAdapter很可能只制作INSERTS并且不能进行更新。

这是我的代码：

private void StockSqlBuilder() 
{
DataSet SqlCeDataset = new DataSet("source");
DataSet SqlDataset = new DataSet("destination");

try
{
    _conn.Open();
    // Pull data from local database SQLCE
    using (SqlCeDataAdapter sourceDA = new SqlCeDataAdapter("SELECT * FROM stock", _conn))
    {
        MessageBox.Show("Pull Stock from CE");
        sourceDA.Fill(SqlCeDataset, "stock");
    }
    _conn.Close();

    _remoteConn.Open();
    // Connect to SQL Server database to push data
    using (SqlDataAdapter destinationDA = new SqlDataAdapter("SELECT * FROM stock", _remoteConn))
    {
        // Get table of remote SQL Server, then loop through all rows of SQLCE and add them to dataset
        SqlCommandBuilder cmdBuilder = new SqlCommandBuilder(destinationDA);
        destinationDA.Fill(SqlDataset, "stock");

        foreach (DataRow row in SqlCeDataset.Tables["stock"].Rows)
        {
            SqlDataset.Tables[0].NewRow();
            SqlDataset.Tables[0].Rows.Add(row.ItemArray);
        }


        destinationDA.Update(SqlDataset, "stock");
    }
    _remoteConn.Close();
}
catch (SqlException Sqlex)
{
    MessageBox.Show(Sqlex.Message);
    this.returnStatus = false;
}
catch (SqlCeException SqlCEex)
{
    MessageBox.Show(SqlCEex.Message);
    this.returnStatus = false;
}
}

另外，如果你的项目有双向SQL同步的其他解决方案，我会全神贯注，但我尝试了很多不同的东西。

Answer 1

使用临时表进行合并查询并比较选择性更新的日期时得到了良好的结果：

       string mergeQuery = @"--Synchronize the target table with refreshed data from source table
            MERGE dbo.stock AS TARGET
            USING dbo.stock_sync AS SOURCE 
            ON (TARGET.product_id = SOURCE.product_id) 
            --When records are matched, update the records if there is any change
            WHEN MATCHED AND SOURCE.date_stock > TARGET.date_stock THEN
            UPDATE SET TARGET.spot= SOURCE.spot, 
            TARGET.date_stock = SOURCE.date_stock,
            TARGET.loading_id = SOURCE.loading_id 
            --When no records are matched, insert the incoming records from source table to target table
            WHEN NOT MATCHED BY TARGET THEN 
            INSERT (spot, product_id, date_stock, loading_id) 
            VALUES (SOURCE.spot, SOURCE.product_id, SOURCE.date_stock, SOURCE.loading_id);

            SELECT * FROM dbo.stock;";

            // Merge the two tables by matching code_barre row
            SqlCommand mergeSql = new SqlCommand(mergeQuery, _remoteConn);
            int rowsAffected = mergeSql.ExecuteNonQuery();
            MessageBox.Show("Données affectées : " + rowsAffected);

            // Clean the temporary source table
            SqlCommand recleanSql = new SqlCommand("TRUNCATE TABLE dbo.stock_sync", _remoteConn);
            recleanSql.ExecuteNonQuery();

DataAdapter：如果行已存在，则更新，否则插入

1 个答案: