MySQL如何通过实例化对象参数查询数据 ？（源代码）

本篇文章给大家带来的内容是关于MySQL如何通过实例化对象参数查询数据 ？（源代码），有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。public static string QueryByEntity<T>(T t) where T : new(){string resultstr = string.Empty;MySqlDataReader reader = null;try{Type type = typeof(T);PropertyInfo[] properties = type.GetProperties();string select = string.Format("Select * from {0} {1}", type.Name, "{0}");string where = string.Empty;foreach (PropertyInfo property in properties){var value = t.GetPropertyValue<T>(property);if (value != null && !value.Equals(property.GetDefaultValue())){if (string.IsNullOrEmpty(where)){where = string.Format(" where {0}='{1}' ", property.Name, value);}else{where = string.Format(" {0} and {1} = '{2}' ", where, property.Name, value);}}}select = string.Format(select, where);MySqlConnection connection = OpenConnection();if (connection == null)return resultstr;MySqlCommand _sqlCom = new MySqlCommand(select, connection);reader = _sqlCom.ExecuteReader();List<T> tList = new List<T>();while (reader.Read()){T t1 = new T();foreach (PropertyInfo property in properties){if (!string.IsNullOrEmpty(reader[property.Name].ToString())){property.SetMethod.Invoke(t1, new object[] { reader[property.Name] });}}tList.Add(t1);}resultstr = JsonConvert.SerializeObject(tList);}catch (Exception ex){Logging.Error(string.Format("查询数据库失败，{0}", ex.Message));}finally{if (reader != null){reader.Close();reader.Dispose();}}return resultstr;}internal static class ObjectExtend{public static object GetPropertyValue<T>(this object obj, PropertyInfo property){Type type = typeof(T);PropertyInfo propertyInfo = type.GetProperty(property.Name);if (propertyInfo != null){return propertyInfo.GetMethod.Invoke(obj, null);}return null;}public static object GetDefaultValue(this PropertyInfo property){return property.PropertyType.IsValueType ? Activator.CreateInstance(property.PropertyType) : null;}}通过实例化参数，对属性赋值，将对象作为参数传入，反射获取对象名称，列名，列值。要求对象名与表名一致，属性与列名一致。

以上就是对的全部介绍，如果您想了解更多有关MySQL视频教程，请关注PHP中文网。以上就是MySQL如何通过实例化对象参数查询数据 ？（源代码）的详细内容，更多请关注小潘博客其它相关文章！