Question

我正在尝试用SSIS中的对象变量填充数据表，但我遇到了问题。第一次通过脚本组件时，数据表会被填充，但是当下一行通过脚本时，代码不会填充数据集，并且整个脚本无法正常工作。有什么帮助解决这个问题？

ScriptComponent Code
Main.cs
/// <summary>
/// This method is called once for every row that passes through the component from Input0.
///
/// Example of reading a value from a column in the the row:
///  string zipCode = Row.ZipCode
///
/// Example of writing a value to a column in the row:
///  Row.ZipCode = zipCode
/// </summary>
/// <param name="Row">The row that is currently passing through the component</param>
public override void Input0_ProcessInputRow(Input0Buffer Row)
{
    OleDbDataAdapter sc = new OleDbDataAdapter();
    DataTable dt = new DataTable();
    sc.Fill(dt, Variables.SpecialCharacter); //Problem occurs here, Fill method doesn't fill after first row is processed by the script.
    List<StringValidation> listObj = new List<StringValidation>();

    foreach (DataRow row in dt.Rows)
    {
        object[] array = row.ItemArray;
        StringValidation varObj = new StringValidation();
        varObj.SourceCharacter = array[0].ToString();
        varObj.TargetCode = array[1].ToString();
        listObj.Add(varObj);
    }

    StringValidation obj = new StringValidation();
    Row.ADDRL1 = obj.RemoveInvalidCharacter(Row.ADDRL1, listObj, "ADDRL1");
    Row.ADDRL2 = obj.RemoveInvalidCharacter(Row.ADDRL2, listObj, "ADDRL2");
}

StringValidation.cs
public class StringValidation
{
    public string SourceCharacter { get; set; }
    public string TargetCode { get; set; }

    public string RemoveInvalidCharacter(string text, List<StringValidation> listObj, string ColumnName)
    {
        foreach (StringValidation obj in listObj)
        {
            if (text.Contains(obj.SourceCharacter))
            {
                text = text.Replace(obj.SourceCharacter, obj.TargetCode);
            }
        }

        return text;
    }
}

Answer 1

将只需运行一次的代码移至PreExecute（）

尝试将DataTable填充移动到PreExecute（）方法中。它只需要加载一次，因此如果你这样做，多次加载引起的任何问题都应该消失。请参阅下面的代码（和评论）。

/* Turn adapter and table into member variables */
OleDbDataAdapter sc = new OleDbDataAdapter();
DataTable dt = new DataTable();

public override void PreExecute()
{
    /* Fill data table in PreExecute(). Only needs to be loaded once. If it only works the first time this should fix it. */
    sc.Fill(dt, Variables.SpecialCharacter);
}

public override void Input0_ProcessInputRow(Input0Buffer Row)
{
    List<StringValidation> listObj = new List<StringValidation>();

    foreach (DataRow row in dt.Rows)
    {
        object[] array = row.ItemArray;
        StringValidation varObj = new StringValidation();
        varObj.SourceCharacter = array[0].ToString();
        varObj.TargetCode = array[1].ToString();
        listObj.Add(varObj);
    }

    StringValidation obj = new StringValidation();
    Row.ADDRL1 = obj.RemoveInvalidCharacter(Row.ADDRL1, listObj, "ADDRL1");
    Row.ADDRL2 = obj.RemoveInvalidCharacter(Row.ADDRL2, listObj, "ADDRL2");
}

并尝试使用此功能来提高性能和更清晰的代码

如果将所有内容移到PreExecute（）部分（见下文），您可能会获得更好的性能。我还使用Linq来简化创建List（）对象。

/* Don't forget to add using System.Linq; at the top of the page. */

List<StringValidation> stringValidations;
public override void PreExecute()
{
    OleDbDataAdapter sc = new OleDbDataAdapter();
    DataTable dt = new DataTable();
    sc.Fill(dt, Variables.SpecialCharacter);
    stringValidations = (from scRow in dt.Rows
                         select new StringValidation
                         {
                             SourceCharacter = scRow[0].ToString(),
                             TargetCode = scRow[1].ToString()
                         }).ToList();
}

public override void Input0_ProcessInputRow(Input0Buffer Row)
{
    List<StringValidation> listObj = new List<StringValidation>();

    StringValidation obj = new StringValidation();
    Row.ADDRL1 = obj.RemoveInvalidCharacter(Row.ADDRL1, stringValidations, "ADDRL1");
    Row.ADDRL2 = obj.RemoveInvalidCharacter(Row.ADDRL2, stringValidations, "ADDRL2");
}

SSIS - OleDBDataAdapter填充方法不填充数据表

1 个答案: