使用C＃将XML导入SQL

Question

我知道寻求这种帮助并不是一件容易的事，但是我已经坚持了一段时间-现在我正在阅读两本C＃书，每天工作超过9个小时。

好的，这是我的问题：我有一个几乎完整的WinForms C＃应用程序。在SQL中，我有三个看起来像这样的表：

CREATE TABLE [dbo].[Racuni](
[BROJ] [varchar](12) NULL,
[DATUM] [datetime] NULL,
[TS] [datetime] NULL,
[USER_ID] [int] NULL,
[KASA_ID] [varchar](3) NULL,
[TOTAL] [float] NULL,
[STATUS] [varchar](1) NULL,
[ARH] [varchar](max) NULL
 ) ON [PRIMARY]

Create Table "Rac_Npl" 
( br_rac Char( 12 )
, kasa_id Char( 3 )
, npl_id Integer
, iznos Money);

CREATE TABLE [dbo].[Stavke](
[br_rac] [varchar](12) NULL,
[kasa_id] [char](3) NULL,
[art_id] [int] NULL,
[kol] [float] NULL,
[mpc] [money] NULL,
[ompc] [money] NULL)

我在本地磁盘上有XML文件，用于导入这三个表-XML看起来像这样：

<?xml version="1.0" encoding="windows-1250"?>
<transaction>
<table name="qryRacuniSmjene">
<fields>
<field name="BROJ" type="1" size="12"/>
<field name="DATUM" type="9" size="0"/>
<field name="TS" type="11" size="0"/>
<field name="USER_ID" type="3" size="0"/>
<field name="KASA_ID" type="1" size="3"/>
<field name="TOTAL" type="8" size="4"/>
<field name="STATUS" type="1" size="1"/>
<field name="ARH" type="16" size="1"/>
</fields>
<data>
<row>
<![CDATA[09-0002-0001]]>
<![CDATA[16.04.2009]]>
<![CDATA[16.04.2009 13:23:27]]>
<![CDATA[1]]>
<![CDATA[001]]>
<![CDATA[2,60]]>
<![CDATA[D]]>
<![CDATA[
   porezni broj: 000000000000
   Zaobilaznica bb
]]>
</row>
<row>
<![CDATA[09-0002-0002]]>
<![CDATA[16.04.2009]]>
<![CDATA[16.04.2009 13:23:27]]>
<![CDATA[1]]>
<![CDATA[001]]>
<![CDATA[2,60]]>
<![CDATA[D]]>
<![CDATA[
   porezni broj: 000000000001
   Zaobilaznica bb
]]>
</row>
</data>
</table>
<table name="qryRac_nplSmjene">
<fields>
<field name="br_rac" type="1" size="12"/>
<field name="kasa_id" type="1" size="3"/>
<field name="npl_id" type="3" size="0"/>
<field name="iznos" type="8" size="4"/>
</fields>
<data>
<row>
<![CDATA[09-0002-0001]]>
<![CDATA[001]]>
<![CDATA[1]]>
<![CDATA[2,60]]>
</row>
<row>
<![CDATA[09-0002-0002]]>
<![CDATA[001]]>
<![CDATA[1]]>
<![CDATA[2,60]]>
</row>
</data>
</table>
<table name="qryStavkeSmjene">
<fields>
<field name="br_rac" type="1" size="12"/>
<field name="kasa_id" type="1" size="3"/>
<field name="art_id" type="3" size="0"/>
<field name="kol" type="6" size="0"/>
<field name="mpc" type="8" size="4"/>
<field name="ompc" type="8" size="4"/>
</fields>
<data>
<row>
<![CDATA[09-0002-0001]]>
<![CDATA[001]]>
<![CDATA[152414]]>
<![CDATA[1,000]]>
<![CDATA[2,60]]>
<![CDATA[2,60]]>
</row>
<row>
<![CDATA[09-0002-0001]]>
<![CDATA[001]]>
<![CDATA[152414]]>
<![CDATA[1,000]]>
<![CDATA[2,60]]>
<![CDATA[2,60]]>
</row>
</data>
</table>
</transaction>

再一次让我感到尴尬，以这种方式请求帮助，但是我将尽一切可能尝试支持StackOverflow。

Answer 1

跨实现不始终支持多个CDATA元素。例如，您将无法通过XDocument或通过SelectNodes访问它们。如果您可以更改输入格式，那将使事情变得更容易。

该代码未经测试，没有错误处理或错误的数据检查，但它应该使您入门。使用XPathDocument /
XPathNavigator进行性能研究，并阅读我的嵌入式注释。

class XmlCsvImport
{
    public void ImportData(string xmlData, ConnectionStringSettings connectionSettings)
    {
        DbProviderFactory providerFactory = DbProviderFactories.GetFactory(connectionSettings.ProviderName);

        IDbConnection connection = providerFactory.CreateConnection();
        connection.ConnectionString = connectionSettings.ConnectionString;

        // TODO: Begin transaction

        XmlDocument doc = new XmlDocument();
        doc.LoadXml(xmlData);

        foreach (XmlNode tableNode in doc.SelectNodes("/transaction/table"))
        {
            IDbCommand command = CreatCommand(connection, tableNode);

            foreach (XmlNode rowNode in tableNode.SelectNodes("data/row"))
            {
                string[] values = GetRowValues(rowNode);

                if (values.Length != command.Parameters.Count)
                {
                    // TODO: Log bad row
                    continue;
                }

                this.FillCommand(command, values);
                command.ExecuteNonQuery();
            }
        }

        // TODO: Commit transaction
    }

    private IDbCommand CreatCommand(IDbConnection connection, XmlNode tableNode)
    {
        string tableName = tableNode.Attributes["name"].Value;

        IDbCommand command = connection.CreateCommand();
        command.Connection = connection;
        command.CommandType = CommandType.Text;

        XmlNodeList fieldNodes = tableNode.SelectNodes("fields/field");

        List<string> fieldNameList = new List<string>(fieldNodes.Count);

        foreach (XmlNode fieldNode in tableNode.SelectNodes("fields/field"))
        {
            string fieldName = fieldNode.Attributes["name"].Value;
            int fieldType = Int32.Parse(fieldNode.Attributes["type"].Value);
            int fieldSize = Int32.Parse(fieldNode.Attributes["size"].Value);

            IDbDataParameter param = command.CreateParameter();
            param.ParameterName = String.Concat("@", fieldNode.Attributes["name"]);
            param.Size = fieldSize;
            param.DbType = (DbType)fieldType; // NOTE: this may not be so easy
            command.Parameters.Add(param);

            fieldNameList.Add(fieldName);
        }

        string[] fieldNames = fieldNameList.ToArray();

        StringBuilder commandBuilder = new StringBuilder();
        commandBuilder.AppendFormat("INSERT INTO [{0}] (", tableName);

        string columnNames = String.Join("], [", fieldNames);
        string paramNames = String.Join(", @", fieldNames);

        command.CommandText = String.Concat(
            "INSERT INTO [", tableName, "] ([",
            columnNames,
            "]) VALUES (@",
            paramNames,
            ")"
            );

        return command;
    }

    private string[] GetRowValues(XmlNode row)
    {
        List<string> values = new List<string>();

        foreach (XmlNode child in row.ChildNodes)
        {
            if (child.NodeType == XmlNodeType.Text ||
                child.NodeType == XmlNodeType.CDATA)
            {
                values.Add(child.Value);
            }
        }

        return values.ToArray();
    }

    private void FillCommand(IDbCommand command, string[] values)
    {
        for (int i = 0; i < values.Length; i++)
        {
            IDbDataParameter param = (IDbDataParameter)command.Parameters[i];
            param.Value = values[i]; // TODO: Convert to correct data type
        }
    }