IDAL: data access layer interface, the interface is a series of 'function' of the statement or list, no interface implementation details.
IDAL's role is to implement separate access to the data with the client, in line with "Program to an interface, not an implementation" design principle, this
1. The client does not depend on the specific implementation class DAL
2. By factory class / class configuration settings change the specific implementation (such as from Oracle to SQLServer)
1. The client does not depend on the specific implementation class DAL
2. By factory class / class configuration settings change the specific implementation (such as from Oracle to SQLServer)
DAL: data access layer, primarily used for data logic processing, specifically providing data services to business logic or presentation layer.
IDAL's first look at the design:
ICustom.cs
public interface ICustom
{
/// <summary>
/// 添加一条记录
/// </summary>
/// <param name="Custom"></param>
/// <returns></returns>
int Addcustom(custom Custom);
/// <summary>
/// 概据帐户名获取用户的信息
/// </summary>
/// <param name="nename"></param>
/// <returns></returns>
custom Getsinglecname(string nename);
/// <summary>
/// 更样用户的密码
/// </summary>
/// <param name="Custom"></param>
void Updatepassword(custom Custom);
/// <summary>
/// 获取用户列表
/// </summary>
/// <returns></returns>
List<custom> Getcustom();
/// <summary>
/// 根据ID删除用户记录
/// </summary>
/// <param name="nid"></param>
void Deletecustom(int nid);
/// <summary>
/// 根据ID获取用户信息
/// </summary>
/// <param name="nid"></param>
/// <returns></returns>
custom Getcustomer(int nid);
/// <summary>
/// 更新用户信息
/// </summary>
/// <param name="Custom"></param>
void updatecustom(custom Custom);
/// <summary>
/// 根据部门ID获取部门员工列表
/// </summary>
/// <param name="nid"></param>
/// <returns></returns>
List<custom> Getdepartcustom(int nid); }
With corresponding customSQL.cs want to design:
public class customSQL:ICustom
{
public int Addcustom(custom Custom)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@cname",SqlDbType.NVarChar,50,Custom.cname),
sqlHelper .CreateInParam("@departID",SqlDbType.Int ,4,Custom.departID),
sqlHelper .CreateInParam("@age",SqlDbType.Int,4,Custom.age),
sqlHelper.CreateInParam("@ename",SqlDbType.NVarChar,50,Custom.ename),
sqlHelper.CreateInParam("@password",SqlDbType.NVarChar,50,Custom.password)
};
try
{
return (sqlHelper.RunProc("spInsertCustom", ParamList));
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public custom Getsinglecname(string nename)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] Paramlist = {
sqlHelper.CreateInParam("ename",SqlDbType.NVarChar,50,nename)
};
SqlDataReader dr = null;
try
{
sqlHelper.RunProc("spGetsingleename", Paramlist, out dr);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
custom Custom = new custom();
while (dr.Read())
{
Custom.id = Int32.Parse(dr["id"].ToString());
Custom.cname = dr["cname"].ToString();
Custom.ename = dr["ename"].ToString();
Custom.departID = int.Parse(dr["departID"].ToString());
Custom.password = dr["password"].ToString();
Custom.age = int.Parse(dr["age"].ToString());
}
dr.Dispose();
return Custom;
}
public void Updatepassword(custom Custom)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@id",SqlDbType.Int,4,Custom.id),
sqlHelper.CreateInParam("@cname",SqlDbType.NVarChar,50,Custom.cname),
sqlHelper .CreateInParam("@departID",SqlDbType.Int ,4,Custom.departID),
sqlHelper .CreateInParam("@age",SqlDbType.Int,4,Custom.age),
sqlHelper.CreateInParam("@ename",SqlDbType.NVarChar,50,Custom.ename),
sqlHelper.CreateInParam("@password",SqlDbType.NVarChar,50,Custom.password)
};
try
{
sqlHelper.RunProc("spUpdatepassword", ParamList);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public List<custom> Getcustom()
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlDataReader dr = null;
try
{
sqlHelper.RunProc("spGetcustom", out dr);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
return ConvertDrToCustomList(dr);
}
public void Deletecustom(int nid)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] Paramlist = {
sqlHelper.CreateInParam("id",SqlDbType.Int,4,nid)
};
try
{
sqlHelper.RunProc("spDeletecustom", Paramlist);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public custom Getcustomer(int nid)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] Paramlist = {
sqlHelper.CreateInParam("id",SqlDbType.Int,4,nid)
};
SqlDataReader dr = null;
try
{
sqlHelper.RunProc("spGetcustomer", Paramlist, out dr);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
dr.Dispose();
return ConvertDrToCustom(dr);
}
public void updatecustom(custom Custom)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@id",SqlDbType.Int,4,Custom.id),
sqlHelper.CreateInParam("@cname",SqlDbType.NVarChar,50,Custom.cname),
sqlHelper .CreateInParam("@departID",SqlDbType.Int ,4,Custom.departID),
sqlHelper .CreateInParam("@age",SqlDbType.Int,4,Custom.age),
sqlHelper.CreateInParam("@ename",SqlDbType.NVarChar,50,Custom.ename)
};
try
{
sqlHelper.RunProc("spupdatecustom", ParamList);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public List<custom> Getdepartcustom(int nid)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlDataReader dr = null;
SqlParameter[] Paramlist = {
sqlHelper.CreateInParam("departID",SqlDbType.Int,4,nid)
};
try
{
sqlHelper.RunProc("spGetdepartcustom", Paramlist, out dr);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
return ConvertDrToCustomList(dr);
}
private custom ConvertDrToCustom(SqlDataReader dr)
{
custom Custom = new custom();
while (dr.Read())
{
departmentSQL DepartmentSQL = new departmentSQL();
department Department = new department();
Department = DepartmentSQL.Getsingledepartment(Int32.Parse(dr["departID"].ToString()));
Custom.id = Int32.Parse(dr["id"].ToString());
Custom.ename = dr["ename"].ToString();
Custom.cname = dr["cname"].ToString();
Custom.age = Int32.Parse(dr["age"].ToString());
Custom.departID = Int32.Parse(dr["departID"].ToString());
Custom.departname = Department.departname;
Custom.password = dr["password"].ToString();
}
dr.Dispose();
return Custom;
}
private List<custom> ConvertDrToCustomList(SqlDataReader dr)
{
List<custom> Customlist = new List<custom>();
while (dr.Read())
{
departmentSQL DepartmentSQL = new departmentSQL();
department Department = new department();
Department = DepartmentSQL.Getsingledepartment(Int32.Parse(dr["departID"].ToString()));
custom Custom = new custom();
Custom.id = Int32.Parse(dr["id"].ToString());
Custom.ename = dr["ename"].ToString();
Custom.cname = dr["cname"].ToString();
Custom.age = Int32.Parse(dr["age"].ToString());
Custom.departID = Int32.Parse(dr["departID"].ToString());
Custom.departname = Department.departname;
Custom.password = dr["password"].ToString();
Customlist.Add(Custom);
Custom = null;
}
dr.Dispose();
return Customlist;
}
}
Then look at IDepartment.cs design:
public interface IDepartment
{
/// <summary>
/// 增加一条部门数据
/// </summary>
/// <param name="Department"></param>
/// <returns></returns>
int Adddepartment(department Department);
/// <summary>
/// 获取部门列表
/// </summary>
/// <returns></returns>
List<department> Getdepartment();
/// <summary>
/// 根据部门ID获取部门信息
/// </summary>
/// <param name="nid"></param>
/// <returns></returns>
department Getsingledepartment(int nid);
/// <summary>
/// 根据部门名称获取部门信息
/// </summary>
/// <param name="ndepartname"></param>
/// <returns></returns>
department Getdepartmenter(string ndepartname);
/// <summary>
/// 更新部门信息
/// </summary>
/// <param name="Department"></param>
void Updatepartment(department Department);
/// <summary>
/// 根据ID删除部门信息
/// </summary>
/// <param name="nid"></param>
void Deletedepart(int nid); }
Correspondingly departmentSQL.cs design:
public class departmentSQL:IDepartment
{
public int Adddepartment(department Department)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@departname",SqlDbType.NVarChar,50,Department.departname),
sqlHelper .CreateInParam("@description",SqlDbType.NVarChar,50,Department.description)
};
try
{
return (sqlHelper.RunProc("spInsertDepartment", ParamList));
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public List<department> Getdepartment()
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlDataReader dr = null;
try
{ sqlHelper.RunProc("spGetAlldepartment", out dr); }
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
return ConvertDrToListDepartment(dr);
}
private List<department> ConvertDrToListDepartment(SqlDataReader dr)
{
List<department> Departmentlist = new List<department>();
while (dr.Read())
{
department Department = new department();
Department.id = Int32.Parse(dr["id"].ToString());
Department.departname = dr["departname"].ToString();
Department.description = dr["description"].ToString();
Departmentlist.Add(Department);
Department = null;
}
dr.Dispose();
return Departmentlist;
}
public department Getsingledepartment(int nid)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@id",SqlDbType.Int,4,nid)
};
SqlDataReader dr = null;
try
{ sqlHelper.RunProc("spGetdepartment",ParamList,out dr); }
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
return ConvertDrToDepartment(dr);
}
public department Getdepartmenter(string ndepartname)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@departname",SqlDbType.NVarChar,50,ndepartname)
};
SqlDataReader dr = null;
try
{ sqlHelper.RunProc("spGetdepartmenter", ParamList, out dr); }
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
return ConvertDrToDepartment(dr);
}
public void Updatepartment(department Department)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@id",SqlDbType.Int,4,Department.id),
sqlHelper.CreateInParam("@departname",SqlDbType.NVarChar,50,Department.departname),
sqlHelper .CreateInParam("@description",SqlDbType.NVarChar,50,Department.description)
};
try
{
sqlHelper.RunProc("spupdatedepart", ParamList);
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
public void Deletedepart(int nid)
{
SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();
SqlParameter[] ParamList = {
sqlHelper.CreateInParam("@id",SqlDbType.Int,4,nid)
};
try
{ sqlHelper.RunProc("spdeletedepart", ParamList); }
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
throw new Exception(ex.Message, ex);
}
}
private department ConvertDrToDepartment(SqlDataReader dr)
{
department Department = new department();
while (dr.Read())
{
Department.id = Int32.Parse(dr["id"].ToString());
Department.departname = dr["departname"].ToString();
Department.description = dr["description"].ToString();
}
dr.Dispose();
return Department;
}
}
DAL layer design we finished, then we started designing the BLL, and welcome Paizhuan.
Your continued attention is me going was the best motivation.
Reproduced in: https: //www.cnblogs.com/springyangwc/archive/2011/03/26/1996025.html