本文整理汇总了C#中DBHelper.AsEnumerable方法的典型用法代码示例。如果您正苦于以下问题：C# DBHelper.AsEnumerable方法的具体用法？C# DBHelper.AsEnumerable怎么用？C# DBHelper.AsEnumerable使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DBHelper的用法示例。
在下文中一共展示了DBHelper.AsEnumerable方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: CreateSearchSql
/// <summary>
/// 生成查询语句
/// </summary>
/// <param name="conStr">数据库连接</param>
/// <param name="tableName">表名</param>
/// <param name="owner">表来源</param>
/// <param name="dr">数据</param>
/// <returns></returns>
public static string CreateSearchSql(string conStr, string tableName, string owner, DataRow dr)
{
//TableSchema dt = new TableSchema(new DatabaseSchema(new SqlSchemaProvider(), conStr), tableName, owner, DateTime.MinValue);
DataTable st = new DBHelper(conStr).ExecuteTable(string.Format(ConfigurationSettings.AppSettings["ColumnSearchSql"], tableName));
var pkWhereStr = from pk in st.AsEnumerable().Where(c => c["pk"].ToString() == "0").ToArray() select string.Format(" {0}='{1}' ", pk["name"], dr[pk["name"].ToString()]);
return string.Format("select * from {0} where {1}", tableName, string.Join(" and ", pkWhereStr.ToArray()));
}示例2: QueryDiffRows
/// <summary>
/// 查询两张表的数据差异
/// </summary>
/// <param name="conFrom">源数据连接</param>
/// <param name="tableFrom">源表</param>
/// <param name="providerFrom">源数据类型</param>
/// <param name="whereStrFrom">源数据筛选条件</param>
/// <param name="conTo">目标数据连接</param>
/// <param name="TableTo">目标表</param>
/// <param name="providerTo">目标数据类型</param>
/// <param name="whereStrTo">目标数据筛选条件</param>
/// <param name="fields">比较的字段</param>
/// <param name="primaryKeys">主键</param>
/// <returns>目标表中与源表不一样的数据</returns>
public static IEnumerable<DataRow> QueryDiffRows(string conFrom, string tableFrom,string providerFrom,string whereStrFrom, string conTo, string TableTo,string providerTo,string whereStrTo,string fields,string primaryKeys)
{
//差异数据存储器
List<DataRow> diff = new List<DataRow>();
//目标数据的表结构
//TableSchema st = new TableSchema(new DatabaseSchema(new SqlSchemaProvider(), conTo), TableTo, "dbo", DateTime.MinValue);
DataTable st = new DBHelper(conTo, providerTo).ExecuteTable(string.Format(ConfigurationSettings.AppSettings["ColumnSearchSql"], TableTo));
//查询两个数据源
DataTable dtFrom = new DBHelper(conFrom, providerFrom).ExecuteTable(string.Format("select {0} from {1} {2}", fields, tableFrom, string.IsNullOrEmpty(whereStrFrom) ? "" : string.Format(" where {0}", whereStrFrom)));
DataTable dtTo = new DBHelper(conTo, providerTo).ExecuteTable(string.Format("select {0} from {1} {2}", fields, TableTo, string.IsNullOrEmpty(whereStrTo) ? "" : string.Format(" where {0}", whereStrTo)));
//如果主键只有1列，则开始判断（暂时只处理主键只有一个的逻辑）
List<string> pks = new List<string>();
if (!string.IsNullOrEmpty(primaryKeys))
pks = primaryKeys.Split(',').ToList();
else
pks = st.AsEnumerable().Where(c => c["pk"].ToString() == "1").Select(c => c["name"].ToString()).ToList();
#region 开始判断
if (pks.Count == 1)
{
string pk = pks[0];
var unpk = st.AsEnumerable().Where(c => c["pk"].ToString() == "0").Select(c => c["name"].ToString()).ToList();
foreach (var item in dtTo.AsEnumerable())
{
var sourceitems =dtFrom.AsEnumerable().Where(c=>c[pk].ToString() == item[pk].ToString());
if (sourceitems.Count() == 0)
diff.Add(item);
else
{
var sourceitem=sourceitems.First();
foreach (var up in st.AsEnumerable().Where(c => c["pk"].ToString() == "0").ToList())
{
bool add = false;
#region 非主键判断
#region 如果一个为空，另一个不空，则两者不相等
if ((sourceitem[up["name"].ToString()] != DBNull.Value && item[up["name"].ToString()] == DBNull.Value) || (sourceitem[up["name"].ToString()] == DBNull.Value && item[up["name"].ToString()] != DBNull.Value))
{
diff.Add(item);
add = true;
}
#endregion
#region 如果都不为空，则将数据类型转换后再比较（如果不转换，会通通认为不相等）
else if (sourceitem[up["name"].ToString()] != DBNull.Value && item[up["name"].ToString()] != DBNull.Value)
{
switch (up["ctype"].ToString())
{
case "varchar":
case "nvarchar":
case "char":
case "nchar":
case "text":
case "ntext":
if (sourceitem[up["name"].ToString()].ToString() != item[up["name"].ToString()].ToString())
{
diff.Add(item);
add = true;
}
break;
case "bit":
if (Convert.ToBoolean(sourceitem[up["name"].ToString()]) != Convert.ToBoolean(item[up["name"].ToString()]))
{
diff.Add(item);
add = true;
}
break;
case "int":
case "bigint":
case "tinyint":
if (Convert.ToInt64(sourceitem[up["name"].ToString()]) != Convert.ToInt64(item[up["name"].ToString()]))
{
diff.Add(item);
add = true;
}
break;
case "decimal":
case "numeric":
if (Convert.ToDecimal(sourceitem[up["name"].ToString()]) != Convert.ToDecimal(item[up["name"].ToString()]))
{
diff.Add(item);
add = true;
}
break;
case "date":
case "datetime":
//.........这里部分代码省略.........