Dapper.NET使用入门(二)【Helper】

勤奋是你生命的密码，能译出你一部壮丽的史诗。

Dapper简单的CRUD帮助类

    /// <summary>
    /// 对于Dapper.SimpleCRUD扩展主类
    /// </summary>
    public static partial class SimpleCRUD
    {
        /// <summary>
        /// 数据库服务器方言
        /// </summary>
        public enum Dialect
        {
            SQLServer,
            PostgreSQL,
            SQLite,
            MySQL,
        }

        private static Dialect _dialect = Dialect.SQLServer;
        private static string _encapsulation;
        private static string _getIdentitySql;
        private static string _getPagedListSql;

        static SimpleCRUD()
        {
            SetDialect(_dialect);
        }

        /// <summary>
        /// 返回当前方言名称
        /// </summary>
        /// <returns></returns>
        public static string GetDialect()
        {
            return _dialect.ToString();
        }

        /// <summary>
        /// 设置数据库方言
        /// </summary>
        /// <param name="dialect"></param>
        public static void SetDialect(Dialect dialect)
        {
            switch (dialect)
            {
                case Dialect.PostgreSQL:
                    _dialect = Dialect.PostgreSQL;
                    _encapsulation = "{0}";
                    _getIdentitySql = string.Format("SELECT LASTVAL() AS id");
                    _getPagedListSql =
                        "Select {SelectColumns} from {TableName} {WhereClause} Order By {OrderBy} LIMIT {RowsPerPage} OFFSET (({PageNumber}-1) * {RowsPerPage})";
                    break;
                case Dialect.SQLite:
                    _dialect = Dialect.SQLite;
                    _encapsulation = "{0}";
                    _getIdentitySql = string.Format("SELECT LAST_INSERT_ROWID() AS id");
                    _getPagedListSql =
                        "Select {SelectColumns} from {TableName} {WhereClause} Order By {OrderBy} LIMIT {RowsPerPage} OFFSET (({PageNumber}-1) * {RowsPerPage})";
                    break;
                case Dialect.MySQL:
                    _dialect = Dialect.MySQL;
                    _encapsulation = "`{0}`";
                    _getIdentitySql = string.Format("SELECT LAST_INSERT_ID() AS id");
                    _getPagedListSql =
                        "Select {SelectColumns} from {TableName} {WhereClause} Order By {OrderBy} LIMIT {Offset},{RowsPerPage}";
                    break;
                default:
                    _dialect = Dialect.SQLServer;
                    _encapsulation = "[{0}]";
                    _getIdentitySql = string.Format("SELECT CAST(SCOPE_IDENTITY() AS BIGINT) AS [id]");
                    _getPagedListSql =
                        "SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY {OrderBy}) AS PagedNumber, {SelectColumns} FROM {TableName} {WhereClause}) AS u WHERE PagedNUMBER BETWEEN (({PageNumber}-1) * {RowsPerPage} + 1) AND ({PageNumber} * {RowsPerPage})";
                    break;
            }
        }

        /// <summary>
        /// <para>默认情况下查询匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// 
        /// <para>通过对Id列默认筛选器</para>
        /// <para>ID列名可以添加主键属性[Key]来覆盖</para>
        /// 
        /// <para>支持事务，命令超时</para>
        /// <para>从表T 一个ID返回一个单一的实体</para>
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connection"></param>
        /// <param name="id"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>从表T 一个ID返回一个单一的实体</returns>
        public static T Get<T>(this IDbConnection connection, object id, IDbTransaction transaction = null,
            int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            List<PropertyInfo> idProps = GetIdProperties(currenttype).ToList();

            if (!idProps.Any())
                throw new ArgumentException("Get<T> only supports an entity with a [Key] or Id property");
            if (idProps.Count() > 1)
                throw new ArgumentException("Get<T> only supports an entity with a single [Key] or Id property");

            PropertyInfo onlyKey = idProps.First();
            string name = GetTableName(currenttype);
            var sb = new StringBuilder();
            sb.Append("Select ");
            //创建类型的新空实例，以获得基本属性
            BuildSelect(sb, GetScaffoldableProperties((T) Activator.CreateInstance(typeof (T))).ToArray());
            sb.AppendFormat(" from {0}", name);
            sb.Append(" where " + GetColumnName(onlyKey) + " = @Id");

            var dynParms = new DynamicParameters();
            dynParms.Add("@id", id);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("Get<{0}>: {1} with Id: {2}", currenttype, sb, id));

            return connection.Query<T>(sb.ToString(), dynParms, transaction, true, commandTimeout).FirstOrDefault();
        }

        /// <summary>
        /// <para>默认情况下查询匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>whereConditions条件是一个匿名类型来过滤结果 ex: new {Category = 1, SubCategory=2}</para>
        /// 
        /// <para>支持事务，命令超时</para>
        /// <para>返回匹配条件的实体列表</para>
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connection"></param>
        /// <param name="whereConditions"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>获取具有可选的精确匹配的条件的实体列表</returns>
        public static IEnumerable<T> GetList<T>(this IDbConnection connection, object whereConditions,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            List<PropertyInfo> idProps = GetIdProperties(currenttype).ToList();
            if (!idProps.Any())
                throw new ArgumentException("Entity must have at least one [Key] property");

            string name = GetTableName(currenttype);

            var sb = new StringBuilder();
            PropertyInfo[] whereprops = GetAllProperties(whereConditions).ToArray();
            sb.Append("Select ");
            //创建该类型的新的空实例来获得基本属性
            BuildSelect(sb, GetScaffoldableProperties((T) Activator.CreateInstance(typeof (T))).ToArray());
            sb.AppendFormat(" from {0}", name);

            if (whereprops.Any())
            {
                sb.Append(" where ");
                BuildWhere(sb, whereprops, (T) Activator.CreateInstance(typeof (T)), whereConditions);
            }

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("GetList<{0}>: {1}", currenttype, sb));

            return connection.Query<T>(sb.ToString(), whereConditions, transaction, true, commandTimeout);
        }

        /// <summary>
        /// <para>默认情况下查询匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>条件是一个SQL where子句 和/或ORDER BY子句 ex: "where name='bob'"</para>
        /// <para>支持事务，命令超时</para>
        /// <para>返回匹配条件的实体列表</para>
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connection"></param>
        /// <param name="conditions"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>获取实体具有可选的SQL where条件列表</returns>
        public static IEnumerable<T> GetList<T>(this IDbConnection connection, string conditions,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            List<PropertyInfo> idProps = GetIdProperties(currenttype).ToList();
            if (!idProps.Any())
                throw new ArgumentException("Entity must have at least one [Key] property");

            string name = GetTableName(currenttype);

            var sb = new StringBuilder();
            sb.Append("Select ");
            //创建该类型的新空实例来获得基本属性
            BuildSelect(sb, GetScaffoldableProperties((T) Activator.CreateInstance(typeof (T))).ToArray());
            sb.AppendFormat(" from {0}", name);

            sb.Append(" " + conditions);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("GetList<{0}>: {1}", currenttype, sb));

            return connection.Query<T>(sb.ToString(), null, transaction, true, commandTimeout);
        }

        public static IEnumerable<T> GetList<T>(this IDbConnection connection)
        {
            return connection.GetList<T>(new {});
        }

        public static IEnumerable<T> GetListPaged<T>(this IDbConnection connection, int pageNumber, int rowsPerPage,
            string conditions, string orderby, IDbTransaction transaction = null, int? commandTimeout = null)
        {
            if (string.IsNullOrEmpty(_getPagedListSql))
                throw new Exception("GetListPage is not supported with the current SQL Dialect");

            if (pageNumber < 1)
                throw new Exception("Page must be greater than 0");

            Type currenttype = typeof (T);
            List<PropertyInfo> idProps = GetIdProperties(currenttype).ToList();
            if (!idProps.Any())
                throw new ArgumentException("Entity must have at least one [Key] property");

            string name = GetTableName(currenttype);
            var sb = new StringBuilder();
            string query = _getPagedListSql;
            if (string.IsNullOrEmpty(orderby))
            {
                orderby = GetColumnName(idProps.First());
            }

            //创建类型的新空实例，以获得基本属性
            BuildSelect(sb, GetScaffoldableProperties((T) Activator.CreateInstance(typeof (T))).ToArray());
            query = query.Replace("{SelectColumns}", sb.ToString());
            query = query.Replace("{TableName}", name);
            query = query.Replace("{PageNumber}", pageNumber.ToString());
            query = query.Replace("{RowsPerPage}", rowsPerPage.ToString());
            query = query.Replace("{OrderBy}", orderby);
            query = query.Replace("{WhereClause}", conditions);
            query = query.Replace("{Offset}", ((pageNumber - 1)*rowsPerPage).ToString());

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("GetListPaged<{0}>: {1}", currenttype, query));

            return connection.Query<T>(query, null, transaction, true, commandTimeout);
        }

        /// <summary>
        /// <para>插入行到数据库</para>
        /// <para>默认情况下插入到匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>将过滤掉Id列，任何[Key]属性的列</para>
        /// <para>标有[Editable(false)] 属性和复杂类型的属性被忽略</para>
        /// <para>支持事务，命令超时</para>
        /// <para>
        /// 如果是identity的int?类型，返回新插入的记录的ID（主键）,否则返回null
        /// </para>
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="entityToInsert"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>如果是identity的int?类型，返回新插入的记录的ID（主键）,否则返回null</returns>
        public static int? Insert(this IDbConnection connection, object entityToInsert,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            return Insert<int?>(connection, entityToInsert, transaction, commandTimeout);
        }

        /// <summary>
        /// <para>插入行到数据库</para>
        /// <para>默认情况下插入到匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>将过滤掉Id列，任何[Key]属性的列</para>
        /// <para>标有[Editable(false)] 属性和复杂类型的属性被忽略</para>
        /// <para>支持事务，命令超时</para>
        /// <para>
        /// 如果是identity的int?类型，返回新插入的记录的ID（主键）,否则返回null
        /// </para>
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="entityToInsert"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>如果是identity的int?类型，返回新插入的记录的ID（主键）,否则返回null</returns>
        public static TKey Insert<TKey>(this IDbConnection connection, object entityToInsert,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            List<PropertyInfo> idProps = GetIdProperties(entityToInsert).ToList();

            if (!idProps.Any())
                throw new ArgumentException("Insert<T> only supports an entity with a [Key] or Id property");
            if (idProps.Count() > 1)
                throw new ArgumentException("Insert<T> only supports an entity with a single [Key] or Id property");

            bool keyHasPredefinedValue = false;
            Type baseType = typeof (TKey);
            Type underlyingType = Nullable.GetUnderlyingType(baseType);
            Type keytype = underlyingType ?? baseType;
            if (keytype != typeof (int) && keytype != typeof (uint) && keytype != typeof (long) &&
                keytype != typeof (ulong) && keytype != typeof (short) && keytype != typeof (ushort) &&
                keytype != typeof (Guid))
            {
                throw new Exception("Invalid return type");
            }

            string name = GetTableName(entityToInsert);
            var sb = new StringBuilder();
            sb.AppendFormat("insert into {0}", name);
            sb.Append(" (");
            BuildInsertParameters(entityToInsert, sb);
            sb.Append(") ");
            sb.Append("values");
            sb.Append(" (");
            BuildInsertValues(entityToInsert, sb);
            sb.Append(")");

            if (keytype == typeof (Guid))
            {
                var guidvalue = (Guid) idProps.First().GetValue(entityToInsert, null);
                if (guidvalue == Guid.Empty)
                {
                    Guid newguid = SequentialGuid();
                    idProps.First().SetValue(entityToInsert, newguid, null);
                }
                else
                {
                    keyHasPredefinedValue = true;
                }
                sb.Append(";select '" + idProps.First().GetValue(entityToInsert, null) + "' as id");
            }

            if ((keytype == typeof (int) || keytype == typeof (long)) &&
                Convert.ToInt64(idProps.First().GetValue(entityToInsert, null)) == 0)
            {
                sb.Append(";" + _getIdentitySql);
            }
            else
            {
                keyHasPredefinedValue = true;
            }

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("Insert: {0}", sb));

            IEnumerable<dynamic> r = connection.Query(sb.ToString(), entityToInsert, transaction, true, commandTimeout);

            if (keytype == typeof (Guid) || keyHasPredefinedValue)
            {
                return (TKey) idProps.First().GetValue(entityToInsert, null);
            }
            return (TKey) r.First().id;
        }

        /// <summary>
        /// <para>更新数据库中的单条记录或多条记录</para>
        /// <para>默认情况下更新匹配类名的表</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para> 更新 Id属性和[Key]属性 在数据库中匹配的 记录 </para>
        /// <para>标有[Editable(false)] 属性和复杂类型的属性被忽略</para>
        /// <para>支持事务，命令超时</para>
        /// <para>返回影响的行数</para>
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="entityToUpdate"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>影响的行数</returns>
        public static int Update(this IDbConnection connection, object entityToUpdate, IDbTransaction transaction = null,
            int? commandTimeout = null)
        {
            List<PropertyInfo> idProps = GetIdProperties(entityToUpdate).ToList();

            if (!idProps.Any())
                throw new ArgumentException("Entity must have at least one [Key] or Id property");

            string name = GetTableName(entityToUpdate);

            var sb = new StringBuilder();
            sb.AppendFormat("update {0}", name);

            sb.AppendFormat(" set ");
            BuildUpdateSet(entityToUpdate, sb);
            sb.Append(" where ");
            BuildWhere(sb, idProps, entityToUpdate);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("Update: {0}", sb));

            return connection.Execute(sb.ToString(), entityToUpdate, transaction, commandTimeout);
        }

        /// <summary>
        /// <para> 删除数据库中匹配传入的对象的单条记录或多条记录</para>
        /// <para> 默认删除匹配类名的表中的记录</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>支持事务，命令超时</para>
        /// <para>返回影响的行数</para>
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connection"></param>
        /// <param name="entityToDelete"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>The number of records effected</returns>
        public static int Delete<T>(this IDbConnection connection, T entityToDelete, IDbTransaction transaction = null,
            int? commandTimeout = null)
        {
            List<PropertyInfo> idProps = GetIdProperties(entityToDelete).ToList();


            if (!idProps.Any())
                throw new ArgumentException("Entity must have at least one [Key] or Id property");

            string name = GetTableName(entityToDelete);

            var sb = new StringBuilder();
            sb.AppendFormat("delete from {0}", name);

            sb.Append(" where ");
            BuildWhere(sb, idProps, entityToDelete);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("Delete: {0}", sb));

            return connection.Execute(sb.ToString(), entityToDelete, transaction, commandTimeout);
        }

        /// <summary>
        /// <para>根据ID删除数据库中单条记录或多条记录</para>
        /// <para>默认删除匹配类名的表中的记录</para>
        /// <para>表名称可以通过在你的类增加一个属性[Table("YourTableName")]被覆盖</para>
        /// <para>删除其中ID属性和 [Key]属性 匹配数据库中的记录</para>
        /// <para>影响的行数</para>
        /// 支持事务，命令超时
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connection"></param>
        /// <param name="id"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <returns>影响的行数</returns>
        public static int Delete<T>(this IDbConnection connection, object id, IDbTransaction transaction = null,
            int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            List<PropertyInfo> idProps = GetIdProperties(currenttype).ToList();


            if (!idProps.Any())
                throw new ArgumentException("Delete<T> only supports an entity with a [Key] or Id property");
            if (idProps.Count() > 1)
                throw new ArgumentException("Delete<T> only supports an entity with a single [Key] or Id property");

            PropertyInfo onlyKey = idProps.First();
            string name = GetTableName(currenttype);

            var sb = new StringBuilder();
            sb.AppendFormat("Delete from {0}", name);
            sb.Append(" where " + GetColumnName(onlyKey) + " = @Id");

            var dynParms = new DynamicParameters();
            dynParms.Add("@id", id);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("Delete<{0}> {1}", currenttype, sb));

            return connection.Execute(sb.ToString(), dynParms, transaction, commandTimeout);
        }

        public static int DeleteList<T>(this IDbConnection connection, object whereConditions,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            string name = GetTableName(currenttype);

            var sb = new StringBuilder();
            PropertyInfo[] whereprops = GetAllProperties(whereConditions).ToArray();
            sb.AppendFormat("Delete from {0}", name);
            if (whereprops.Any())
            {
                sb.Append(" where ");
                BuildWhere(sb, whereprops, (T) Activator.CreateInstance(typeof (T)));
            }

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("DeleteList<{0}> {1}", currenttype, sb));

            return connection.Execute(sb.ToString(), whereConditions, transaction, commandTimeout);
        }

        public static int DeleteList<T>(this IDbConnection connection, string conditions,
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            if (string.IsNullOrEmpty(conditions))
                throw new ArgumentException("DeleteList<T> requires a where clause");
            if (!conditions.ToLower().Contains("where"))
                throw new ArgumentException("DeleteList<T> requires a where clause and must contain the WHERE keyword");

            Type currenttype = typeof (T);
            string name = GetTableName(currenttype);

            var sb = new StringBuilder();
            sb.AppendFormat("Delete from {0}", name);
            sb.Append(" " + conditions);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("DeleteList<{0}> {1}", currenttype, sb));

            return connection.Execute(sb.ToString(), null, transaction, commandTimeout);
        }

        /// <summary>
        /// <para>默认查询匹配类名的表中的记录</para>
        /// <para>从表T根据一个ID返回一个条数</para>
        /// </summary>
        public static int RecordCount<T>(this IDbConnection connection, string conditions = "",
            IDbTransaction transaction = null, int? commandTimeout = null)
        {
            Type currenttype = typeof (T);
            string name = GetTableName(currenttype);
            var sb = new StringBuilder();
            sb.Append("Select count(1)");
            sb.AppendFormat(" from {0}", name);
            sb.Append(" " + conditions);

            if (Debugger.IsAttached)
                Trace.WriteLine(String.Format("RecordCount<{0}>: {1}", currenttype, sb));

            return connection.Query<int>(sb.ToString(), null, transaction, true, commandTimeout).Single();
        }

        //构建基于实体列表update语句
        private static void BuildUpdateSet(object entityToUpdate, StringBuilder sb)
        {
            PropertyInfo[] nonIdProps = GetUpdateableProperties(entityToUpdate).ToArray();

            for (int i = 0; i < nonIdProps.Length; i++)
            {
                PropertyInfo property = nonIdProps[i];

                sb.AppendFormat("{0} = @{1}", GetColumnName(property), property.Name);
                if (i < nonIdProps.Length - 1)
                    sb.AppendFormat(", ");
            }
        }

        //build select clause based on list of properties skipping ones with the IgnoreSelect attribute
        //建立SELECT子句 基于属性列表 跳过那些IgnoreSelect属性
        private static void BuildSelect(StringBuilder sb, IEnumerable<PropertyInfo> props)
        {
            IList<PropertyInfo> propertyInfos = props as IList<PropertyInfo> ?? props.ToList();
            bool addedAny = false;
            for (int i = 0; i < propertyInfos.Count(); i++)
            {
                if (
                    propertyInfos.ElementAt(i)
                        .GetCustomAttributes(true)
                        .Any(attr => attr.GetType().Name == "IgnoreSelectAttribute")) continue;

                if (addedAny)
                    sb.Append(",");
                sb.Append(GetColumnName(propertyInfos.ElementAt(i)));
                //如果有一个自定义的列名添加一个“as 自定义列名”的项，以便它映射正确
                if (
                    propertyInfos.ElementAt(i)
                        .GetCustomAttributes(true)
                        .SingleOrDefault(attr => attr.GetType().Name == "ColumnAttribute") != null)
                    sb.Append(" as " + propertyInfos.ElementAt(i).Name);
                addedAny = true;
            }
        }

        private static void BuildWhere(StringBuilder sb, IEnumerable<PropertyInfo> idProps, object sourceEntity,
            object whereConditions = null)
        {
            PropertyInfo[] propertyInfos = idProps.ToArray();
            for (int i = 0; i < propertyInfos.Count(); i++)
            {
                bool useIsNull = false;

                //通过列属性将模型类型转换为数据库列名
                PropertyInfo propertyToUse = propertyInfos.ElementAt(i);
                PropertyInfo[] sourceProperties = GetScaffoldableProperties(sourceEntity).ToArray();
                for (int x = 0; x < sourceProperties.Count(); x++)
                {
                    if (sourceProperties.ElementAt(x).Name == propertyInfos.ElementAt(i).Name)
                    {
                        propertyToUse = sourceProperties.ElementAt(x);

                        if (whereConditions != null && propertyInfos.ElementAt(i).CanRead &&
                            (propertyInfos.ElementAt(i).GetValue(whereConditions, null) == null ||
                             propertyInfos.ElementAt(i).GetValue(whereConditions, null) == DBNull.Value))
                        {
                            useIsNull = true;
                        }
                        break;
                    }
                }
                sb.AppendFormat(
                    useIsNull ? "{0} is null" : "{0} = @{1}",
                    GetColumnName(propertyToUse),
                    propertyInfos.ElementAt(i).Name);

                if (i < propertyInfos.Count() - 1)
                    sb.AppendFormat(" and ");
            }
        }


        //建立插入值，其中包括类的所有属性：
        //不是命名Id
        //不标记Editable(false)的属性
        //不标记[Key]的属性(非必须属性)
        //不标记[IgnoreInsert]
        private static void BuildInsertValues(object entityToInsert, StringBuilder sb)
        {
            PropertyInfo[] props = GetScaffoldableProperties(entityToInsert).ToArray();
            for (int i = 0; i < props.Count(); i++)
            {
                PropertyInfo property = props.ElementAt(i);
                if (property.PropertyType != typeof (Guid)
                    && property.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "KeyAttribute")
                    && property.GetCustomAttributes(true).All(attr => attr.GetType().Name != "RequiredAttribute"))
                    continue;
                if (property.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "IgnoreInsertAttribute"))
                    continue;
                if (
                    property.GetCustomAttributes(true)
                        .Any(attr => attr.GetType().Name == "ReadOnlyAttribute" && IsReadOnly(property))) continue;

                if (property.Name == "Id" &&
                    property.GetCustomAttributes(true).All(attr => attr.GetType().Name != "RequiredAttribute") &&
                    property.PropertyType != typeof (Guid)) continue;
                sb.AppendFormat("@{0}", property.Name);
                if (i < props.Count() - 1)
                    sb.Append(", ");
            }
            if (sb.ToString().EndsWith(", "))
                sb.Remove(sb.Length - 2, 2);
        }

        //build insert parameters which include all properties in the class that are not:
        //建立插入参数，其中包括类的所有属性，除了：
        //标记为 Editable(false)属性
        //标记为 [Key] 属性
        //标记为 [IgnoreInsert]
        //名为 Id的属性
        private static void BuildInsertParameters(object entityToInsert, StringBuilder sb)
        {
            PropertyInfo[] props = GetScaffoldableProperties(entityToInsert).ToArray();

            for (int i = 0; i < props.Count(); i++)
            {
                PropertyInfo property = props.ElementAt(i);
                if (property.PropertyType != typeof (Guid)
                    && property.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "KeyAttribute")
                    && property.GetCustomAttributes(true).All(attr => attr.GetType().Name != "RequiredAttribute"))
                    continue;
                if (property.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "IgnoreInsertAttribute"))
                    continue;

                if (
                    property.GetCustomAttributes(true)
                        .Any(attr => attr.GetType().Name == "ReadOnlyAttribute" && IsReadOnly(property))) continue;
                if (property.Name == "Id" &&
                    property.GetCustomAttributes(true).All(attr => attr.GetType().Name != "RequiredAttribute") &&
                    property.PropertyType != typeof (Guid)) continue;
                sb.Append(GetColumnName(property));
                if (i < props.Count() - 1)
                    sb.Append(", ");
            }
            if (sb.ToString().EndsWith(", "))
                sb.Remove(sb.Length - 2, 2);
        }

        //得到一个实体的所有属性
        private static IEnumerable<PropertyInfo> GetAllProperties(object entity)
        {
            if (entity == null) entity = new {};
            return entity.GetType().GetProperties();
        }

        //Get all properties that are not decorated with the Editable(false) attribute
        //获取未用Editable(false)装饰的所有属性
        private static IEnumerable<PropertyInfo> GetScaffoldableProperties(object entity)
        {
            IEnumerable<PropertyInfo> props =
                entity.GetType()
                    .GetProperties()
                    .Where(
                        p =>
                            p.GetCustomAttributes(true)
                                .Any(attr => attr.GetType().Name == "EditableAttribute" && !IsEditable(p)) == false);
            return props.Where(p => p.PropertyType.IsSimpleType() || IsEditable(p));
        }

        //fake the funk and try to mimick EditableAttribute in System.ComponentModel.DataAnnotations 
        //This allows use of the DataAnnotations property in the model and have the SimpleCRUD engine just figure it out without a reference
        //确定属性有AllowEdit键和返回它的boolean状态
        //并尝试致力于模拟EditableAttribute在System.ComponentModel.DataAnnotations
        //这允许在模型中使用DataAnnotations，不引用并已在SimpleCRUD引擎弄清楚
        private static bool IsEditable(PropertyInfo pi)
        {
            object[] attributes = pi.GetCustomAttributes(false);
            if (attributes.Length > 0)
            {
                dynamic write = attributes.FirstOrDefault(x => x.GetType().Name == "EditableAttribute");
                if (write != null)
                {
                    return write.AllowEdit;
                }
            }
            return false;
        }

        //fake the funk and try to mimick ReadOnlyAttribute in System.ComponentModel 
        //This allows use of the DataAnnotations property in the model and have the SimpleCRUD engine just figure it out without a reference
        //确定属性是否有IsReadOnly键和返回它的boolean状态
        //并尝试致力于模拟ReadOnlyAttribute在System.ComponentModel
        //这允许在模型中使用DataAnnotations，不引用并已在SimpleCRUD引擎只是弄清楚
        private static bool IsReadOnly(PropertyInfo pi)
        {
            object[] attributes = pi.GetCustomAttributes(false);
            if (attributes.Length > 0)
            {
                dynamic write = attributes.FirstOrDefault(x => x.GetType().Name == "ReadOnlyAttribute");
                if (write != null)
                {
                    return write.IsReadOnly;
                }
            }
            return false;
        }

        //得到的所有属性：
        //非名称为 Id
        //没有标记 Key 的属性
        //没有标记 ReadOnly
        //没有标记 IgnoreInsert
        private static IEnumerable<PropertyInfo> GetUpdateableProperties(object entity)
        {
            IEnumerable<PropertyInfo> updateableProperties = GetScaffoldableProperties(entity);
            //根据ID删除一个
            updateableProperties = updateableProperties.Where(p => p.Name != "Id");
            //根据key属性删除一个
            updateableProperties =
                updateableProperties.Where(
                    p => p.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "KeyAttribute") == false);
            //删除readonly的所有
            updateableProperties =
                updateableProperties.Where(
                    p =>
                        p.GetCustomAttributes(true)
                            .Any(attr => (attr.GetType().Name == "ReadOnlyAttribute") && IsReadOnly(p)) == false);
            //根据IgnoreUpdate属性删除
            updateableProperties =
                updateableProperties.Where(
                    p =>
                        p.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "IgnoreUpdateAttribute") == false);

            return updateableProperties;
        }

        //获取 被命名ID的或Key特性的所有属性
        //为了插入和更新
        private static IEnumerable<PropertyInfo> GetIdProperties(object entity)
        {
            Type type = entity.GetType();
            return GetIdProperties(type);
        }

        //获取被命名ID的或Key特性的所有属性
        //对于获取（ID）和删除（ID），我们没有一个实体，正好类型，以便使用此方法
        private static IEnumerable<PropertyInfo> GetIdProperties(Type type)
        {
            List<PropertyInfo> tp =
                type.GetProperties()
                    .Where(p => p.GetCustomAttributes(true).Any(attr => attr.GetType().Name == "KeyAttribute"))
                    .ToList();
            return tp.Any() ? tp : type.GetProperties().Where(p => p.Name == "Id");
        }

        //该实体 获取表名
        //插入和更新，我们有一个完整的实体因此使用这种方法
        //默认使用类名和覆盖，如果类有一个Table属性
        private static string GetTableName(object entity)
        {
            Type type = entity.GetType();
            return GetTableName(type);
        }

        //该实体 获取表名
        //对于获取（ID）和删除（ID），我们没有一个实体，正好类型，以便使用此方法
        //使用动态类型，以便能够同时处理我们的表属性和DataAnnotation
        //默认使用类名和覆盖，如果类有一个Table属性
        private static string GetTableName(Type type)
        {
            //var tableName = String.Format("[{0}]", type.Name);
            string tableName = Encapsulate(type.Name);

            var tableattr =
                type.GetCustomAttributes(true).SingleOrDefault(attr => attr.GetType().Name == "TableAttribute") as
                    dynamic;
            if (tableattr != null)
            {
                //tableName = String.Format("[{0}]", tableattr.Name);
                tableName = Encapsulate(tableattr.Name);
                try
                {
                    if (!String.IsNullOrEmpty(tableattr.Schema))
                    {
                        //tableName = String.Format("[{0}].[{1}]", tableattr.Schema, tableattr.Name);
                        string schemaName = Encapsulate(tableattr.Schema);
                        tableName = String.Format("{0}.{1}", schemaName, tableName);
                    }
                }
                catch (RuntimeBinderException)
                {
                    //架构不存在这个这个属性。
                }
            }

            return tableName;
        }

        private static string GetColumnName(PropertyInfo propertyInfo)
        {
            string columnName = Encapsulate(propertyInfo.Name);

            var columnattr =
                propertyInfo.GetCustomAttributes(true).SingleOrDefault(attr => attr.GetType().Name == "ColumnAttribute")
                    as dynamic;
            if (columnattr != null)
            {
                columnName = Encapsulate(columnattr.Name);
                Trace.WriteLine(String.Format("Column name for type overridden from {0} to {1}", propertyInfo.Name,
                    columnName));
            }
            return columnName;
        }

        private static string Encapsulate(string databaseword)
        {
            return string.Format(_encapsulation, databaseword);
        }

        /// <summary>
        /// 生成基于所述当前日期/时间的guid
        /// </summary>
        /// <returns></returns>
        public static Guid SequentialGuid()
        {
            Guid tempGuid = Guid.NewGuid();
            byte[] bytes = tempGuid.ToByteArray();
            DateTime time = DateTime.Now;
            bytes[3] = (byte) time.Year;
            bytes[2] = (byte) time.Month;
            bytes[1] = (byte) time.Day;
            bytes[0] = (byte) time.Hour;
            bytes[5] = (byte) time.Minute;
            bytes[4] = (byte) time.Second;
            return new Guid(bytes);
        }
    }

属性类：

 /// <summary>
    /// 可选表属性
    /// 您可以使用System.ComponentModel.DataAnnotations版本在它的地方指定POCO的表名
    /// </summary>
    [AttributeUsage(AttributeTargets.Class)]
    public class TableAttribute : Attribute
    {
        /// <summary>
        /// 可选表属性
        /// </summary>
        /// <param name="tableName"></param>
        public TableAttribute(string tableName)
        {
            Name = tableName;
        }

        /// <summary>
        /// 该表的名称
        /// </summary>
        public string Name { get; private set; }

        /// <summary>
        /// 该模式的名字
        /// </summary>
        public string Schema { get; set; }
    }

    /// <summary>
    /// 可选列属性
    /// 您可以使用System.ComponentModel.DataAnnotations版本在它的地方指定POCO的表名
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class ColumnAttribute : Attribute
    {
        /// <summary>
        /// 可选列属性
        /// </summary>
        /// <param name="columnName"></param>
        public ColumnAttribute(string columnName)
        {
            Name = columnName;
        }

        /// <summary>
        /// 列名
        /// </summary>
        public string Name { get; private set; }
    }

   /// <summary>
    /// 可选的键属性
    /// 您可以使用System.ComponentModel.DataAnnotations版本在它的地方指定POCO的主键
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class KeyAttribute : Attribute
    {
    }

    /// <summary>
    /// 可选的键属性
    /// 您可以使用System.ComponentModel.DataAnnotations版本在它的地方指定POCO的必需的属性
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class RequiredAttribute : Attribute
    {
    }

    /// <summary>
    /// 可选的可编辑属性
    /// 您可以使用System.ComponentModel.DataAnnotations版本在它的地方，以指定的属性编辑
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class EditableAttribute : Attribute
    {
        /// <summary>
        /// 可选的可编辑属性
        /// </summary>
        /// <param name="iseditable"></param>
        public EditableAttribute(bool iseditable)
        {
            AllowEdit = iseditable;
        }

        /// <summary>
        /// 这属性是否持久化到数据库
        /// </summary>
        public bool AllowEdit { get; private set; }
    }

    /// <summary>
    /// 可选的只读属性
    /// 您可以使用System.ComponentModel版本在它的地方，以指定可编辑的属性
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class ReadOnlyAttribute : Attribute
    {
        /// <summary>
        /// 可选的只读属性
        /// </summary>
        /// <param name="isReadOnly"></param>
        public ReadOnlyAttribute(bool isReadOnly)
        {
            IsReadOnly = isReadOnly;
        }

        /// <summary>
        /// 这属性是否持久化到数据库
        /// </summary>
        public bool IsReadOnly { get; private set; }
    }

    /// <summary>
    /// 可选的忽略选择属性
    /// 自定义的Dapper.SimpleCRUD排除在选择方法的属性
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class IgnoreSelectAttribute : Attribute
    {
    }

    /// <summary>
    /// 可选的忽略插入属性
    /// 自定义的Dapper.SimpleCRUD排除从插入方法属性
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class IgnoreInsertAttribute : Attribute
    {
    }

    /// <summary>
    /// 可选的忽略更新属性
    /// 自定义的Dapper.SimpleCRUD排除来自更新方法属性
    /// </summary>
    [AttributeUsage(AttributeTargets.Property)]
    public class IgnoreUpdateAttribute : Attribute
    {
    }

类型异常：

internal static class TypeExtension
{
    //您不能插入或更新复杂类型。让我们筛选出来。
    public static bool IsSimpleType(this Type type)
    {
        Type underlyingType = Nullable.GetUnderlyingType(type);
        type = underlyingType ?? type;
        var simpleTypes = new List<Type>
        {
            typeof (byte),
            typeof (sbyte),
            typeof (short),
            typeof (ushort),
            typeof (int),
            typeof (uint),
            typeof (long),
            typeof (ulong),
            typeof (float),
            typeof (double),
            typeof (decimal),
            typeof (bool),
            typeof (string),
            typeof (char),
            typeof (Guid),
            typeof (DateTime),
            typeof (DateTimeOffset),
            typeof (byte[])
        };
        return simpleTypes.Contains(type) || type.IsEnum;
    }
}