ConnectionItem 配置多种不同的数据库连接
ConnEnum 配置数据库的读写分离，依赖于ConnectionItem
DBMapper 初始化读写库
IBaseDAL、BaseDAL数据库底层操作封装类
主要暴露的操作方法有：
DapperExtensions sample：
INSERT:
void Insert(params T[] objs);
dynamic Insert(T obj);
UPDATE：
bool Update(T entity);
bool Update(dynamic updateDict, dynamic keyDict);
DELETE:
bool Delete(IPredicate predicate);
bool Delete(T entity);
bool DeleteById(dynamic id);
COUNT:
int Count(IPredicate predicate);
int Count(string sql = null, string where = null);
int Count(Expression<Func<T, bool>> predicate);
EXISTS:
bool Exists(IPredicate predicate);
bool Exists(string sql = null, string where = null);
bool Exists(Expression<Func<T, bool>> predicate);
GET:
T Get(dynamic id);
T Get(Expression<Func<T, bool>> predicate);
SELECT for simple table:
IEnumerable Where(IPredicate predicate = null, IList sort = null);
IEnumerable Where(IPredicate predicate, IList sort, int pageIndex, int pageSize);
IEnumerable Where(Expression<Func<T, bool>> predicate, string orderBy = null);
IEnumerable Where(Expression<Func<T, bool>> predicate, string orderBy, int pageIndex, int pageSize);
IEnumerable Where(string where, string orderBy = null);
IEnumerable Where(string where, string orderBy, int pageIndex, int pageSize);
SELECT for multiple table:
IEnumerable Query(string sql, int? timeout = null, bool buffered = true) where K : class
IEnumerable Query(string sql, string orderBy, int pageIndex, int pageSize, int? timeout = null, bool buffered = true) where K : class
IEnumerable Query(string sql, int? timeout = null, bool buffered = true)
IEnumerable Query(string sql, string orderBy, int pageIndex, int pageSize, int? timeout = null, bool buffered = true)
Execute Procedure:
dynamic Execute(string pName, DynamicParameters paras = null, int state = 1)