public T FindEntity <T>(Expression <Func <T, bool> > condition) where T : class, new()
{
using (var dbConnection = Connection)
{
string conditionsql = DatabaseCommon.DealExp <T>(condition.ClearLeft(), OperateType.Select).ToString();
var data = dbConnection.Query <T>(conditionsql);
return(data.FirstOrDefault());
}
}
/// <summary>
/// 未实现
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="condition"></param>
/// <returns></returns>
public IQueryable <T> IQueryable <T>(Expression <Func <T, bool> > condition) where T : class, new()
{
using (var dbConnection = Connection)
{
string conditionsql = DatabaseCommon.DealExp <T>(condition.Body, OperateType.Select).ToString();
var data = dbConnection.Query <T>(string.Format(conditionsql));
return(data.AsQueryable());
}
}
public int Delete <T>(Expression <Func <T, bool> > condition) where T : class, new()
{
bool isTrans = true;
if (dbTransaction == null)
{
BeginTrans();
isTrans = false;
}
string conditionsql = DatabaseCommon.DealExp <T>(condition.Body, OperateType.Delete).ToString();
DbCommand cmd = dbTransaction.Connection.CreateCommand();
cmd.Transaction = dbTransaction;
cmd.CommandText = conditionsql;
cmd.ExecuteNonQuery();
if (!isTrans)
{
return(Commit());
}
return(0);
}
public IEnumerable <T> FindList <T>(Expression <Func <T, bool> > condition, string orderField, bool isAsc, int pageSize, int pageIndex, out int total) where T : class, new()
{
using (var dbConnection = Connection)
{
//string strSql = DatabaseCommon.DealExp<T>(condition, OperateType.Select).ToString();
//int num = (pageIndex - 1) * pageSize;
//int num1 = (pageIndex) * pageSize;
//orderField = "order by " + orderField;
//StringBuilder sb = new StringBuilder();
//sb.Append("Select * From (Select ROW_NUMBER() Over (" + orderField + ")");
//sb.Append(" As rowNum, * From (" + strSql + ") As T ) As N Where rowNum > " + num + " And rowNum <= " + num1 + "");
//total = Convert.ToInt32(new DbHelper(dbConnection).ExecuteScalar(CommandType.Text, "Select Count(1) From (" + strSql + ") As t"));
//var dataQuery = dbConnection.Query<T>(sb.ToString());
//return dataQuery.ToList();
string strSql = DatabaseCommon.DealExp <T>(condition, OperateType.Select).
Append($"order by {orderField}").ToString();
//var dataQuery = dbConnection.Query<T>(strSql, buffered: false).AsQueryable();
var dataQuery = dbConnection.Query <T>(strSql);
total = dataQuery.Count();
var data = dataQuery.Skip(pageSize * (pageIndex - 1)).Take(pageSize).AsQueryable();
return(data);
}
}