/// <summary>
/// 获取数据表总项数
/// </summary>
/// <param name="expression">linq表达式 谓词</param>
/// <returns></returns>
public long GetCount(Expression <Func <TEntity, bool> > expression = null)
{
try
{
if (_Conn.State == ConnectionState.Closed)
{
_Conn.Open();
}
var predicate = DapperLinqBuilder <TEntity> .FromExpression(expression);
return(_Conn.Count <TEntity>(predicate));
}
finally
{
_Conn.Close();
}
}
/// <summary>
/// 获取结果集第一条数据
/// </summary>
/// <param name="expression"></param>
/// <param name="sortList"></param>
/// <returns></returns>
public TEntity GetFist(Expression <Func <TEntity, bool> > expression = null, object sortList = null)
{
try
{
if (_Conn.State == ConnectionState.Closed)
{
_Conn.Open();
}
var predicate = DapperLinqBuilder <TEntity> .FromExpression(expression);
var sort = SortConvert(sortList);
var data = _Conn.GetSet <TEntity>(predicate, sort, 0, 1);
return(data.FirstOrDefault());
}
finally
{
_Conn.Close();
}
}
/// <summary>
/// 数据表 分页
/// </summary>
/// <param name="pageNum">指定页数 索引从0开始</param>
/// <param name="pageSize">指定每页多少项</param>
///<param name="outTotal">输出当前表的总项数</param>
/// <param name="expression">条件 linq表达式 谓词</param>
/// <param name="sortList">排序字段</param>
/// <returns></returns>
public IEnumerable <TEntity> GetPageData(int pageNum, int pageSize, out long outTotal,
Expression <Func <TEntity, bool> > expression = null, object sortList = null)
{
try
{
if (_Conn.State == ConnectionState.Closed)
{
_Conn.Open();
}
IPredicateGroup predicate = DapperLinqBuilder <TEntity> .FromExpression(expression); //转换Linq表达式
IList <ISort> sort = SortConvert(sortList); //转换排序接口
var entities = _Conn.GetPage <TEntity>(predicate, sort, pageNum, pageSize, transaction: _Conn.BeginTransaction(IsolationLevel.ReadUncommitted));
outTotal = _Conn.Count <TEntity>(null);
return(entities);
}
finally
{
_Conn.Close();
}
}