使用mybatis框架实现带条件查询-多条件

在实际的项目开发中,使用mybatis框架查询的时候,不可能是只有一个条件的,大部分情况下是有多个条件的,那么多个条件应该怎样传入参数;

思考:

 需求:根据用户姓名(模糊查询),和用户角色对用户表进行查询

UserMapper.xml

1 <!-- 按照名称查询,用户角色,查询用户列表 mybatis给最基础的数据类型都内建了别名,对大小写是不敏感的-->
2     <select id="getUserListByUserName2" parameterType="User" resultType="User" >
3         select * from smbms_user
4          where username like CONCAT ('%',#{userName},'%') 
5          and userRole = #{userRole}
6     </select>

UserMapper.java

 1 public interface UserMapper {
 2     //查询用户表中的数据
 3     //特别要注意的一点是:Mapper接口中的方法名要和Mapper.xml文件中sql语句的id名称要相同,否则是不行滴
 4     public List<User> getUserList();
 5     
 6     //根据用户姓名模糊查询用户表  注意入参要和mapper.xml配置文件中入参保持一致
 7     public List<User> getUserListByUserName(String userName);
 8     
 9     //根据用户姓名模糊查询,用户角色,查询用户表  注意:现在的入参一定是对象
10     public List<User> getUserListByUserName2(User user);
11 
12 
13 }

User.java 实体类

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 1 package cn.smbms.dao.pojo;
 2 
 3 import java.util.Date;
 4 
 5 public class User {
 6     private Integer id; //id 
 7     private String userCode; //鐢ㄦ埛缂栫爜
 8     private String userName; //鐢ㄦ埛鍚嶇О
 9     private String userPassword; //鐢ㄦ埛瀵嗙爜
10     private Integer gender;  //鎬у埆
11     private Date birthday;  //鍑虹敓鏃ユ湡
12     private String phone;   //鐢佃瘽
13     private String address; //鍦板潃
14     private Integer userRole;    //鐢ㄦ埛瑙掕壊
15     private Integer createdBy;   //鍒涘缓鑰?
16     private Date creationDate; //鍒涘缓鏃堕棿
17     private Integer modifyBy;     //鏇存柊鑰?
18     private Date modifyDate;   //鏇存柊鏃堕棿
19     
20     public Integer getId() {
21         return id;
22     }
23     public void setId(Integer id) {
24         this.id = id;
25     }
26     public String getUserCode() {
27         return userCode;
28     }
29     public void setUserCode(String userCode) {
30         this.userCode = userCode;
31     }
32     public String getUserName() {
33         return userName;
34     }
35     public void setUserName(String userName) {
36         this.userName = userName;
37     }
38     public String getUserPassword() {
39         return userPassword;
40     }
41     public void setUserPassword(String userPassword) {
42         this.userPassword = userPassword;
43     }
44     public Integer getGender() {
45         return gender;
46     }
47     public void setGender(Integer gender) {
48         this.gender = gender;
49     }
50     public Date getBirthday() {
51         return birthday;
52     }
53     public void setBirthday(Date birthday) {
54         this.birthday = birthday;
55     }
56     public String getPhone() {
57         return phone;
58     }
59     public void setPhone(String phone) {
60         this.phone = phone;
61     }
62     public String getAddress() {
63         return address;
64     }
65     public void setAddress(String address) {
66         this.address = address;
67     }
68     public Integer getUserRole() {
69         return userRole;
70     }
71     public void setUserRole(Integer userRole) {
72         this.userRole = userRole;
73     }
74     public Integer getCreatedBy() {
75         return createdBy;
76     }
77     public void setCreatedBy(Integer createdBy) {
78         this.createdBy = createdBy;
79     }
80     public Date getCreationDate() {
81         return creationDate;
82     }
83     public void setCreationDate(Date creationDate) {
84         this.creationDate = creationDate;
85     }
86     public Integer getModifyBy() {
87         return modifyBy;
88     }
89     public void setModifyBy(Integer modifyBy) {
90         this.modifyBy = modifyBy;
91     }
92     public Date getModifyDate() {
93         return modifyDate;
94     }
95     public void setModifyDate(Date modifyDate) {
96         this.modifyDate = modifyDate;
97     }
98 }

编写测试类:

 1 @Test
 2     public void test6() {
 3         String userNameString="赵";
 4         Integer userRole=2;
 5         User user=new User();
 6         user.setUserName(userNameString);
 7         user.setUserRole(userRole);
 8         SqlSession sqlSession = null;
 9         java.util.List<User> userList2 = new ArrayList<User>();
10         try {
11             sqlSession = MyBatisUtil.createSqlSession();
12             //使用mapper映射的方式实现
13             //userList2 = sqlSession.selectList("cn.smbms.dao.user.UserMapper.getUserListByUserName",userNameString);
14             //调用mapper接口的方式实现
15             userList2 = sqlSession.getMapper(UserMapper.class).getUserListByUserName2(user);
16             int size = userList2.size();
17             mlogger.info("获取到的记录数是:" + size);
18 
19         } catch (Exception e) {
20             // TODO: handle exception
21         } finally {
22             // 最后一定要注意:关闭会话
23             MyBatisUtil.closeSqlSession(sqlSession);
24 
25         }
26 
27         for (User user2 : userList2) {
28             mlogger.info("用户名:" + user2.getUserName() + ",密码:" + user2.getUserPassword());
29         }
30 
31     }

最终的运行结果:

这里要强调一下,以上的都是数据库字段的名称和实体类的名称是相一致的。

不一致的情况在下面会进行讨论。

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转载自www.cnblogs.com/dongyaotou/p/11783146.html