/// <summary>
/// 根据表达式的条件删除记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="exception"></param>
/// <returns></returns>
public static bool Delete(Expression exception)
{
ConditionBuilderVisitor2 visitor = new ConditionBuilderVisitor2(exception);
var result = visitor.Condition();
string sql = SqlBuider <T> .GetSql(dataType.DeleteWhere) + result.Item1;
return(Excet <bool>(sql, result.Item2.ToArray(), cmd => cmd.ExecuteNonQuery() == 1));
}
/// <summary>
/// 根据表达式条件去查找记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="t"></param>
/// <returns></returns>
public static T GetModel(Expression <Func <T, bool> > expression)
{
ConditionBuilderVisitor2 visitor = new ConditionBuilderVisitor2(expression);
Tuple <string, List <MySqlParameter> > res = visitor.Condition();
string sql = SqlBuider <User> .GetSql(dataType.QCondition) + res.Item1;
return(Excet <T>(sql, res.Item2.ToArray(), cmd =>
{
T t = Activator.CreateInstance <T>();
var reader = cmd.ExecuteReader();
if (reader.Read())
{
foreach (System.Reflection.PropertyInfo item in t.GetType().GetPropertiesName(false))
{
item.SetValue(t, reader[item.Name] is DBNull ? null : reader[item.Name]);
}
}
return t;
}));
}
/// <summary>
/// 根据条件查询多条记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static List <T> GetList(Expression <Func <T, bool> > expression)
{
ConditionBuilderVisitor2 zlc = new ConditionBuilderVisitor2(expression);
var res = zlc.Condition();
string sql = SqlBuider <T> .GetSql(dataType.QCondition) + res.Item1;
return(Excet(sql, res.Item2.ToArray(), cmd =>
{
T t = Activator.CreateInstance <T>();
List <T> list = new List <T>();
var read = cmd.ExecuteReader();
while (read.Read())
{
foreach (System.Reflection.PropertyInfo prop in t.GetType().GetProperties())
{
prop.SetValue(t, read[prop.Name] is DBNull ? null : read[prop.Name]);
}
list.Add(t);
t = Activator.CreateInstance <T>();//重置新的对象
}
return list;
}));
}
