今天闲来无事，做了个简易的ORM 感觉有点像ActiveRecord作业风格，又有点像iBatis
今天闲来无事，做了个的ORM
感觉有点像ActiveRecord作业风格，又有点像iBatis
先上数据表结构图：
然后建立一个简单的POCO类，字段名称和类型应与数据库对应。
1
using
JDML.TestPoco;
2
using
JDML.StaticExtensions;
3
4
namespace
JDML.TestPoco
5
{
6
public
class
User_Role
7
{
8
public
int
?
User_Role_ID {
get
;
set
; }
9
public
string
User_Role_Name {
get
;
set
; }
10
public
string
User_Role_Permission {
get
;
set
; }
11
public
string
User_Role_Remark {
get
;
set
; }
12
public
DateTime
?
UpdateTime {
get
;
set
; }
13
}
14
}
15
基本操作
Insert:
1
User_Role user_role
=
new
User_Role() { User_Role_Name
=
"
Manage
"
};
2
user_role.UpdateTime
=
DateTime.Now;
3
user_role.Insert();
4
无需配置，一跳数据就添加到了User_Role表中了。
Update:
1
User_Role role
=
new
User_Role() { User_Role_ID
=
17
};
2
role.Load();
3
role.User_Role_Name
=
"
zjj
"
;
4
role.User_Role_Permission
=
"
agg
"
;
5
role.Update();
6
读取：
Read:
单条记录：
1
User_Role role
=
new
User_Role() { User_Role_ID
=
17
};
2
role.Load();
3
多条：
1
User_Role role
=
new
User_Role();
2
//
role.ID = 1;
3
role.User_Role_Name
=
"
Sales
"
;
4
IList
<
Object
>
list
=
role.Find();
5
foreach
(Object one
in
list)
6
{
7
UserRole onerole
=
one
as
UserRole;
8
Console.WriteLine(
"
Role_ID:
"
+
onerole.User_Role_ID
+
"
, Role_Name:
"
+
onerole.User_Role_Name
+
"
, Role_Permission:
"
+
onerole.User_Role_Permission
+
"
, UpdateTime:
"
+
onerole.UpdateTime.GetValueOrDefault().ToString());
9
}
10
表映射：
1
using
JDML.Attributes;
2
3
namespace
JDML.TestPoco
4
{
5
6
[Table(
"
User_Role
"
)]
7
public
class
UserRole
8
{
9
//
[Field("User_Role_ID", true)]
10
[Field(FieldName
=
"
User_Role_ID
"
, PrimaryKey
=
true
)]
11
public
int
?
ID {
get
;
set
; }
12
[Field(FieldName
=
"
User_Role_Name
"
, PrimaryKey
=
true
)]
13
public
string
Name {
get
;
set
; }
14
[Field(
"
User_Role_Permission
"
)]
15
public
string
Permission {
get
;
set
; }
16
public
DateTime
?
UpdateTime {
get
;
set
; }
17
}
18
}
19
只要用Table和Field特性定义表名称以及字段名称，就能自己映射。
让我们再来做点复杂点的查询：
添加特性声明：
1
[SQL(MappingClass.SQLCmdType.Select,
"
byID
"
,
"
Select * from User_Role where User_Role_ID > @ID
"
)]
2
public
class
UserRole
3
查询并显示：
1
UserRole role
=
new
UserRole();
2
role.ID
=
50
;
3
IList
<
Object
>
list
=
role.Find(
"
byID
"
);
4
foreach
(Object one
in
list)
5
{
6
UserRole onerole
=
one
as
UserRole;
7
Console.WriteLine(
"
Role_ID:
"
+
onerole.ID
+
"
, Role_Name:
"
+
onerole.Name
+
"
, Role_Permission:
"
+
onerole.Permission
+
"
, UpdateTime:
"
+
onerole.UpdateTime.GetValueOrDefault().ToString());
8
}
9
这样，ID大于50的所有User_Role表中的行都会输出到vs的输出栏中。
更复杂点：
不与表一对一映射：
像 iBatis一样，自定义 Select Insert Update Delete 操作的SQL语句：
1
[SQL(MappingClass.SQLCmdType.Insert,
"
Insert Into User_Role (User_Role_Name,User_Role_Permission) values (@Name,@Permission)
"
)]
2
[SQL(MappingClass.SQLCmdType.Select,
"
Select * from User_Role where User_Role_ID=@ID
"
)]
3
[SQL(MappingClass.SQLCmdType.Select,
"
byName
"
,
"
Select * from User_Role where User_Role_Name=@Name
"
)]
4
[SQL(MappingClass.SQLCmdType.Update,
"
update User_Role set User_Role_Permission=@Permission where User_Role_ID=@ID
"
)]
5
[SQL(MappingClass.SQLCmdType.Delete,
"
delete from User_Role where User_Role_ID=@ID
"
)]
6
然后，再来进行调用试试看：
UserRole role = new UserRole() { ID = 8 };
role.Load();
看User_Role_ID 为 8 的行，载入了！
总共有public boolLoad() 载入单条数据，数据行小于1，返回null，数据行大于2，报错
Public bool Find(string SqlCmdName = “”); 其中sqlcmdname参数为上面定义的
[SQL(MappingClass.SQLCmdType.Select, "byName","Select * from User_Role whereUser_Role_Name=@Name")]
Bool Insert() bool Update() bool Delete()则分别调用
[SQL(MappingClass.SQLCmdType.Insert, "InsertInto User_Role (User_Role_Name,User_Role_Permission) values(@Name,@Permission)")]
[SQL(MappingClass.SQLCmdType.Update, "updateUser_Role set User_Role_Permission=@Permission where User_Role_ID=@ID")]
[SQL(MappingClass.SQLCmdType.Delete,"delete from User_Role whereUser_Role_ID=@ID")]
如果SQL是这样的
[SQL(MappingClass.SQLCmdType.Delete, “byName”,"delete from User_Role where User_Role_Name=@Name")]
则可以这样调用： bool successful =role.Delete(“byName”);
不好意思，代码多了点。框架还没完成。
等完成了会拿出来Share的！！
多谢支持了！！