Nuget调用简单封装.

1. 项目引用Dapper作为直接访问, 为了使用方便, 封装一下.达到效果:
- 数据库连接配置在webconfig.xml中. 
- 常用调用方法封装.

调用: //可以采用单例模式.

//全局实例

        public static DapperEntity DBI
        {
            get
            {
                return DapperEntity.Instance;
            }
        }

//调用
        public static  DateTime GetDBDateTime()
        {
            return DBI.QueryFirst("SELECT GETDATE()");
        }

参考单例:

private static object syncObj = new object();

        private static DapperEntity instance;
        public static DapperEntity Instance
        {
            get
            {
                if (instance == null)
                {
                    lock (syncObj)
                    {
                        if (instance == null)
                        {
                            instance = DapperEntity.Instance
                        }
                    }
                }
                return instance;
            }
        }

封装类:

    //配置在webconfig.xml中

public class DapperEntity
	{
		private static DapperEntity instance;
		private string ConnectionString;
		private IDbConnection DefineConnection;
		private IDbConnection DefaultConnection;
		private IDbTransaction Transaction;
		public static DapperEntity Instance
		{
			get
			{
				return new DapperEntity("");
			}
		}
		public IDbConnection Connection
		{
			get
			{
				IDbConnection result;
				if (this.DefineConnection != null)
				{
					result = this.DefineConnection;
				}
				else
				{
					if (this.DefaultConnection == null)
					{
						this.DefaultConnection = new SqlConnection(this.ConnectionString);
					}
					result = this.DefaultConnection;
				}
				return result;
			}
		}
		public DapperEntity(string connectionStr = "")
		{
			if (string.IsNullOrEmpty(connectionStr))
			{
				connectionStr = ConfigurationManager.ConnectionStrings["TSQLDBConnectionString"].ConnectionString;
			}
			this.ConnectionString = connectionStr;
		}
		public DapperEntity(IDbConnection connection)
		{
			this.DefineConnection = connection;
		}
		public DataBaseType GetDataBaseType()
		{
			string name = this.Connection.GetType().Name;
			string text = name;
			DataBaseType result;
			if (text != null)
			{
				if (text == "SQLiteConnection")
				{
					result = DataBaseType.SQLiteConnection;
					return result;
				}
				if (!(text == "SqlConnection"))
				{
				}
			}
			result = DataBaseType.SqlConnection;
			return result;
		}
}

完整包括方法如下:

public class DapperEntity
	{
		private static DapperEntity instance;
		private string ConnectionString;
		private IDbConnection DefineConnection;
		private IDbConnection DefaultConnection;
		private IDbTransaction Transaction;
		public static DapperEntity Instance
		{
			get
			{
				return new DapperEntity("");
			}
		}
		public IDbConnection Connection
		{
			get
			{
				IDbConnection result;
				if (this.DefineConnection != null)
				{
					result = this.DefineConnection;
				}
				else
				{
					if (this.DefaultConnection == null)
					{
						this.DefaultConnection = new SqlConnection(this.ConnectionString);
					}
					result = this.DefaultConnection;
				}
				return result;
			}
		}
		public DapperEntity(string connectionStr = "")
		{
			if (string.IsNullOrEmpty(connectionStr))
			{
				connectionStr = ConfigurationManager.ConnectionStrings["TSQLDBConnectionString"].ConnectionString;
			}
			this.ConnectionString = connectionStr;
		}
		public DapperEntity(IDbConnection connection)
		{
			this.DefineConnection = connection;
		}
		public DataBaseType GetDataBaseType()
		{
			string name = this.Connection.GetType().Name;
			string text = name;
			DataBaseType result;
			if (text != null)
			{
				if (text == "SQLiteConnection")
				{
					result = DataBaseType.SQLiteConnection;
					return result;
				}
				if (!(text == "SqlConnection"))
				{
				}
			}
			result = DataBaseType.SqlConnection;
			return result;
		}
		public object GetArrayFirst(object param)
		{
			object result;
			if (param.GetType().BaseType.Name == "Array")
			{
				object[] array = param as object[];
				if (array.Length == 0)
				{
					throw new Exception("数组不能为空");
				}
				result = array[0];
			}
			else
			{
				result = null;
			}
			return result;
		}
		private string BindQueryPageSql(string sql, PageQueryParams pqp)
		{
			int num = (pqp.PageIndex - 1) * pqp.PageSize;
			int num2 = num + pqp.PageSize;
			return string.Concat(new object[]
			{
				"select * from (select row_number()over(order by ",
				pqp.OrderField,
				" ",
				pqp.OrderDirection.ToString(),
				")rownumber,* from (",
				sql,
				")t1)t2 WHERE rownumber>",
				num,
				" and rownumber<=",
				num2
			});
		}
		public PageQueryModel OQueryPage(PageQueryParams pageQueryParams, string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
		{
			int total = Convert.ToInt32(this.Connection.ExecuteScalar("select count(*) from (" + sql + ")a", param, transaction, commandTimeout, commandType));
			sql = this.BindQueryPageSql(sql, pageQueryParams);
			return new PageQueryModel
			{
				Total = total,
				Data = this.Connection.Query(sql, param, transaction, buffered, commandTimeout, commandType)
			};
		}
		[return: Dynamic(new bool[]
		{
			false,
			true
		})]
		public PageQueryModel OQueryPage(PageQueryParams pageQueryParams, string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
		{
			int total = Convert.ToInt32(this.Connection.ExecuteScalar("select count(*) from (" + sql + ")a", param, transaction, commandTimeout, commandType));
			sql = this.BindQueryPageSql(sql, pageQueryParams);
			return new PageQueryModel