/// <summary>
/// 根据条件去进行查询
/// ConditionBuilderVisitor2
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="expression">条件表达式</param>
/// <returns>单个实体</returns>
//public T GetModel<T>(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;
// });
// return default(T);
//}
/// <summary>
/// 自写表达式树 根据条件去查询实体
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="expression">表达式</param>
/// <returns>单个实体</returns>
public T GetModel <T>(Expression <Func <T, bool> > expression)
{
QinVisitor <T> visitor = new QinVisitor <T>(expression);
(string res, Dictionary <string, object> pairs) = visitor.GetResult();
List <MySqlParameter> pp = pairs.GetMySqlPar();
string sql = SqlBuider <T> .GetSql(dataType.QCondition) + res;
return(Excet <T>(sql, pp.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]);
}
}
else
{
return default;
}
return t;
}));
}
/// <summary>
/// 根据条件去进行查询
/// ConditionBuilderVisitor2
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="expression">条件表达式</param>
/// <returns></returns>
public List <T> GetList <T>(Expression <Func <T, bool> > expression)
{
// ConditionBuilderVisitor2 zlc = new ConditionBuilderVisitor2(expression);
// var res = zlc.Condition();
QinVisitor <T> visitor = new QinVisitor <T>(expression);
(string res, Dictionary <string, object> pairs) = visitor.GetResult();
List <MySqlParameter> pp = pairs.GetMySqlPar();
string sql = SqlBuider <T> .GetSql(dataType.QCondition) + res;
return(Excet(sql, pp.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().GetPropertiesName(false))
{
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;
}));
}
/// <summary>
/// 二次解析
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private string GetSublevel(Expression node)
{
QinVisitor <TS> z_ = new QinVisitor <TS>(node);
return(z_.GetResult().Item1.ToString());
}
