Ibatisnet的xml映射文件主要包括这几个部分,resultMaps,parameterMaps,下面分别说一下IBatisnet的映射文件中的Elements及其Attributes.
一、Statements 简单的说,这一部分里放的是对数据库操作的SQL语句及存储过程等,它包括以下子元素:| Statement Element | Attributes | Child Elements | Methods |
|---|---|---|---|
| <statement> | id parameterClass resultClass listClass parameterMap resultMap cacheModel | All dynamic elements | Insert Update Delete All query methods |
| <insert> | id parameterClass parameterMap | All dynamic elements | Insert Update Delete |
| <update> | id parameterClass parameterMap extends | All dynamic elements | Insert Update Delete |
| <delete> | id parameterClass parameterMap extends | All dynamic elements | Insert Update Delete |
| <select> | id parameterClass resultClass listClass parameterMap resultMap cacheModel extends | All dynamic elements | All query methods |
| <procedure> | id parameterMap resultClass resultMap cacheModel | All dynamic elements | Insert Update Delete All query methods |
< parameterMaps > < parameterMap id ="simpleinsert" class ="Employees" > < parameter property ="id" /> < parameter property ="empcode" /> </ parameterMap > </ parameterMaps > < statement id ="insertEmployee" parameterMap ="simpleinsert" > insert into Employees (Id, EmpCode) values (?,?); </ statement > 上面代码中的parameterMap中我们定义了两个参数id,empcode，而在下面的statement中的insert语句的第一个?就会被id的值所取代，第二个?的值为empcode的值。当然IBatisnet中并不是这样一种参数的定义方式，另外还有两种inline,named方式。
3、parameterClass 还是看上面的例子，如果我们没有对statement指定parameterMap，我们还可以通过指定parameterClass并使用inline parameter来完成同样的目的。如下： < statement id ="insertEmployee" parameterClass ="OPS.Domain.Employees,OPS.Domain" > insert into Employees (Id, EmpCode) values (#Id#,#EmpCode#); </ statement > parameterClass也可以直接写成Employees。
< statement id ="insertEmployee" parameterClass ="Employees" > insert into Employees (Id, EmpCode) values (#Id#,#EmpCode#); </ statement > 4、resultMap
通过设置resultMap，我们可以控制如何从查询的结果集中提取数据。比如我们只需要结果集中的某几列就可以来设置resultMap中的result来完成。 < resultMaps > < resultMap id ="SelectResult" class ="Employees" > < result property ="Id" column ="id" /> < result property ="EmpCode" column ="empcode" /> < result property ="EmpPassword" column ="emppassword" /> < result property ="EmpName" column ="empname" /> < result property ="EmpSex" column ="empsex" /> < result property ="EmpAge" column ="empage" /> < result property ="EmpMail" column ="empmail" /> < result property ="EmpPhoneNo" column ="empphoneno" /> < result property ="Description" column ="description" /> < result property ="IsAdmin" column ="isadmin" /> < result property ="IsDelete" column ="isdelete" /> </ resultMap > </ resultMaps >
< statement id ="SelectEmployees" resultMap ="Employees" > select * from Employees </ statement > 上面这个statement的查询结果就返回Employees的所有列，如果你只想返回其中几列，只需要更改resultMap就可以了。
5、resultClass 对于控制查询结果的返回值，我们也可以通过设置resultClass来代替resultMap。指定的resultClass将自动对应到查询结果的列。 < select id ="SelectEmployees" parameterClass ="int" resultClass ="Employees" > Select id as Id, empcode as EmpCode, emppassword as EmpPassword, empname as EmpName, empsex as EmpSex, empage as EmpAge, empmail as EmpMail, empphoneno as EmpPhoneNo, description as Description, isadmin as IsAdmin, isdelete as IsDelete From Employees </ select > Employees.cs应包括Id,EmpCode,EmpPassword,EmpName,EmpSex,EmpAge,EmpMail,EmpPhoneNo,Description,IsAdmin,IsDelete这些属性。
Employee.cs using System;namespace OPS.Domain
{ 
/**//// <summary>
/// Employees 
/// </summary> [Serializable] public class Employees { public Employees() { } private int id; /**////<sumary> /// Id ///</sumary> public int Id { get{ return id;} set{id = value;} } private string empcode; /**////<sumary> /// EmpCode ///</sumary> public string EmpCode { get{ return empcode;} set{empcode = value;} } private string emppassword; /**////<sumary> /// EmpPassword ///</sumary> public string EmpPassword { get{ return emppassword;} set{emppassword = value;} } private string empname; /**////<sumary> /// EmpName ///</sumary> public string EmpName { get{ return empname;} set{empname = value;} } private string empsex; /**////<sumary> /// EmpSex ///</sumary> public string EmpSex { get{ return empsex;} set{empsex = value;} } private int? empage; /**////<sumary> /// EmpAge ///</sumary> public int? EmpAge { get{ return empage;} set{empage = value;} } private string empmail; /**////<sumary> /// EmpMail ///</sumary> public string EmpMail { get{ return empmail;} set{empmail = value;} } private string empphoneno; /**////<sumary> /// EmpPhoneNo ///</sumary> public string EmpPhoneNo { get{ return empphoneno;} set{empphoneno = value;} } private string description; /**////<sumary> /// Description ///</sumary> public string Description { get{ return description;} set{description = value;} } private string isadmin; /**////<sumary> /// IsAdmin ///</sumary> public string IsAdmin { get{ return isadmin;} set{isadmin = value;} } private string isdelete; /**////<sumary> /// IsDelete ///</sumary> public string IsDelete { get{ return isdelete;} set{isdelete = value;} } }
} 6、listClass 为了提供返回IList of Objects的能力，statement中可以使用强类型的自定义集合类来做为listClass Attribute的值。这个类必须实现System.Collections.CollectionBase。当然statement还需指定resultClass，使得DataMapper知道如何在集合中处理这种类型。使用方法如下：
EmployeeCollection using System;using System.Collections;using System.Text;namespace OPS.Domain{ public class EmployeeCollection : CollectionBase { public EmployeeCollection() { } public Employees this[int index] { get { return (Employees)List[index]; } set { List[index] = value; } } public int Add(Employees value) { return List.Add(value); } public void AddRange(Employees[] value) { for (int i = 0; i < value.Length; i++) { Add(value[i]); } } public void AddRange(EmployeeCollection value) { for (int i = 0; i < value.Count; i++) { Add(value[i]); } } public bool Contains(Employees value) { return List.Contains(value); } public void CopyTo(Employees[] array, int index) { List.CopyTo(array, index); } public int IndexOf(Employees value) { return List.IndexOf(value); } public void Insert(int index, Employees value) { List.Insert(index, value); } public void Remove(Employees value) { List.Remove(value); } }}
< select id = " SelectEmployees " parameterClass = " int " resultClass = " Employess " listClass = " EmployeeCollection " > Select id as Id, empcode as EmpCode, emppassword as EmpPassword, empname as EmpName, empsex as EmpSex, empage as EmpAge, empmail as EmpMail, empphoneno as EmpPhoneNo, description as Description, isadmin as IsAdmin, isdelete as IsDelete From Employees </ select > < cacheModel id ="employee-cache" implementation ="LRU" > < flushInterval hours ="24" /> < flushOnExecute statement ="insertEmployee" /> < flushOnExecute statement ="updateEmployee" /> < flushOnExecute statement ="deleteEmployee" /> < property name ="size" value ="1000" /> </ cacheModel > < statement id ="selectAllEmployees" cacheModel ="employee-cache" > select * from Employees </ statement > < select id ="SelectEmployees" parameterClass ="int" resultMap ="SelectResult" > Select id, empcode, emppassword, empname, empsex, empage, empmail, empphoneno, description, isadmin, isdelete From Employees </ select > <!-- 员工列表 --> < select id ="EmployeeList" parameterClass ="int" resultMap ="SelectResult" extends ="SelectEmployees" > Where isdelete='n' </ select > <!-- 员工明细 --> < select id ="EmployeeDetail" parameterClass ="int" resultMap ="SelectResult" extends ="SelectEmployees" > Where id=#Id# </ select > <!-- 登录验证 --> < select id ="Login" parameterClass ="int" resultMap ="SelectResult" extends ="SelectEmployees" > Where empcode=#EmpCode# and emppassword=#EmpPassword# and isdelete='n' </ select > <!-- 判断员工编号是否重复 --> < select id ="CheckEmpCode" parameterClass ="String" resultMap ="SelectResult" extends ="SelectEmployees" > Where empcode=#EmpCode# and isdelete='n' </ select >