处理XSD数据集ConstraintExceptions

Question

有没有人有任何处理XSD数据集抛出的ConstraintExceptions的技巧？

这是神秘消息的例外:

System.Data.ConstraintException : Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Answer 1

我最近发现的一些提示.

1. 使用TableAdapter FillByDataXXXX()方法而不是GetDataByXXXX()方法要好得多,因为可以查询传递给fill方法的DataTable以获取线索:

   • DataTable.GetErrors()返回错误的DataRow实例数组
   • DataRow.RowError包含行错误的描述
   • DataRow.GetColumnsInError()返回错误的DataColumn实例数组

2. 最近,我将一些询问代码包装到ConstraintException的子类中,结果证明它是一个有用的调试起点.

C#示例用法:

Example.DataSet.fooDataTable table = new DataSet.fooDataTable();

try
{
    tableAdapter.Fill(table);
}
catch (ConstraintException ex)
{
    // pass the DataTable to DetailedConstraintException to get a more detailed Message property
    throw new DetailedConstraintException("error filling table", table, ex);
}

输出:

DetailedConstraintException:表填充失败
为ConstraintExceptionHelper.DataSet + fooDataTable报告的错误[foo]
错误列:[1]
[PRODUCT_ID] - 受影响的总行数:1085
行错误:[4]
[列'PRODUCT_ID'被限制为唯一.值'1'已经存在.] - 受影响的总行数:1009
[列'PRODUCT_ID'被限制为唯一.值'2'已经存在.] - 受影响的总行数:20
[列'PRODUCT_ID'被限制为唯一.值'4'已经存在.] - 受影响的总行数:34
[列'PRODUCT_ID'被限制为唯一.值'6'已经存在.] - 受影响的总行数:22
----> System.Data.ConstraintException:无法启用约束.一行或多行包含违反非null,唯一或外键约束的值.

我不知道这是否包含在Stack Overflow答案中的代码太多,但这里完全是C#类.免责声明:这对我有用,请随意使用/修改.

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

namespace ConstraintExceptionHelper
{

    /// <summary>
    /// Subclass of ConstraintException that explains row and column errors in the Message property
    /// </summary>
    public class DetailedConstraintException : ConstraintException
    {

        private const int InitialCountValue = 1;


        /// <summary>
        /// Initialises a new instance of DetailedConstraintException with the specified string and DataTable
        /// </summary>
        /// <param name="message">exception message</param>
        /// <param name="ErroredTable">DataTable in error</param>
        public DetailedConstraintException(string message, DataTable erroredTable)
            : base(message)
        {
            ErroredTable = erroredTable;
        }


        /// <summary>
        /// Initialises a new instance of DetailedConstraintException with the specified string, DataTable and inner Exception
        /// </summary>
        /// <param name="message">exception message</param>
        /// <param name="ErroredTable">DataTable in error</param>
        /// <param name="inner">the original exception</param>
        public DetailedConstraintException(string message, DataTable erroredTable, Exception inner)
            : base(message, inner)
        {
            ErroredTable = erroredTable;
        }


        private string buildErrorSummaryMessage()
        {
            if (null == ErroredTable) { return "No errored DataTable specified"; }
            if (!ErroredTable.HasErrors) { return "No Row Errors reported in DataTable=[" + ErroredTable.TableName + "]"; }

            foreach (DataRow row in ErroredTable.GetErrors())
            {
                recordColumnsInError(row);
                recordRowsInError(row);
            }

            StringBuilder sb = new StringBuilder();

            appendSummaryIntro(sb);
            appendErroredColumns(sb);
            appendRowErrors(sb);

            return sb.ToString();
        }


        private void recordColumnsInError(DataRow row)
        {
            foreach (DataColumn column in row.GetColumnsInError())
            {
                if (_erroredColumns.ContainsKey(column.ColumnName))
                {
                    _erroredColumns[column.ColumnName]++;
                    continue;
                }

                _erroredColumns.Add(column.ColumnName, InitialCountValue);
            }
        }


        private void recordRowsInError(DataRow row)
        {
            if (_rowErrors.ContainsKey(row.RowError))
            {
                _rowErrors[row.RowError]++;
                return;
            }

            _rowErrors.Add(row.RowError, InitialCountValue);
        }


        private void appendSummaryIntro(StringBuilder sb)
        {
            sb.AppendFormat("Errors reported for {1} [{2}]{0}", Environment.NewLine, ErroredTable.GetType().FullName, ErroredTable.TableName);
        }


        private void appendErroredColumns(StringBuilder sb)
        {
            sb.AppendFormat("Columns in error: [{1}]{0}", Environment.NewLine, _erroredColumns.Count);

            foreach (string columnName in _erroredColumns.Keys)
            {
                sb.AppendFormat("\t[{1}] - rows affected: {2}{0}",
                                Environment.NewLine,
                                columnName,
                                _erroredColumns[columnName]);
            }
        }


        private void appendRowErrors(StringBuilder sb)
        {
            sb.AppendFormat("Row errors: [{1}]{0}", Environment.NewLine, _rowErrors.Count);

            foreach (string rowError in _rowErrors.Keys)
            {
                sb.AppendFormat("\t[{1}] - rows affected: {2}{0}",
                                Environment.NewLine,
                                rowError,
                                _rowErrors[rowError]);
            }
        }


        /// <summary>
        /// Get the DataTable in error
        /// </summary>
        public DataTable ErroredTable
        {
            get { return _erroredTable; }
            private set { _erroredTable = value; }
        }


        /// <summary>
        /// Get the original ConstraintException message with extra error information
        /// </summary>
        public override string Message
        {
            get { return base.Message + Environment.NewLine + buildErrorSummaryMessage(); }
        }


        private readonly SortedDictionary<string, int> _rowErrors = new SortedDictionary<string, int>();
        private readonly SortedDictionary<string, int> _erroredColumns = new SortedDictionary<string, int>();
        private DataTable _erroredTable;
    }
}