mybatis的curd

「爱情、让人受尽委屈。」 2022-05-08 03:30 170阅读 0赞

mabatis\_config.xml

1.  `<?xml version="1.0" encoding="UTF-8" ?>`
2.  `<!DOCTYPE configuration`
3.  `PUBLIC "-//mybatis.org//DTD Config 3.0//EN"`
4.  `"http://mybatis.org/dtd/mybatis-3-config.dtd">`
5.  `<configuration>`
6.  `<properties resource="curd.properties"></properties>`
7.  `<typeAliases>`
8.  `<typeAlias alias="Category" type="mybatis.curd.model.Category" />`
9.  `</typeAliases>`
10. `<environments default="development">`
11. `<environment id="development">`
12. `<transactionManager type="JDBC" />`
13. `<dataSource type="POOLED">`
14. `<property name="driver" value="${driver}" />`
15. `<property name="url" value="${url}" />`
16. `<property name="username" value="${username}" />`
17. `<property name="password" value="${password}" />`
18. `</dataSource>`
19. `</environment>`
20. `</environments>`
21. `<mappers>`
22. `<mapper resource="mybatis/curd/dao/sql/category.xml" />`
23. `</mappers>`
24. `</configuration>`

curd.properties

1.  `driver=com.mysql.jdbc.Driver`
2.  `url=jdbc:mysql://localhost:3306/db_mybatis_test?Unicode=true&characterEncoding=UTF-8`
3.  `username=root`
4.  `password=`

简单的mybatis工具类封装，获取sqlSessionFactory  
MybatisUtil.java

1.  `package mybatis.curd.util;`
2.  
3.  `import java.io.IOException;`
4.  `import java.io.InputStream;`
5.  
6.  `import org.apache.ibatis.io.Resources;`
7.  `import org.apache.ibatis.session.SqlSessionFactory;`
8.  `import org.apache.ibatis.session.SqlSessionFactoryBuilder;`
9.  
10. `public class MybatisUtil {`
11. `private static SqlSessionFactory sqlSessionFactory = null;`
12. 
13. `static {`
14. `try {`
15. `String resource = "mybatis_config.xml";`
16. `InputStream is = Resources.getResourceAsStream(resource);`
17. `sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);`
18. `} catch (IOException e) {`
19. `e.printStackTrace();`
20. `}`
21. `}`
22. 
23. `public static SqlSessionFactory getSqlSessionFactory() {`
24. `return sqlSessionFactory;`
25. `}`
26. `}`

定义实体bean  
Category.java

1.  `package mybatis.curd.model;`
2.  
3.  `/**`
4.  `* POJO`
5.  `*`
6.  `* @author guxingke`
7.  `* */`
8.  `public class Category {`
9.  `private Integer id;`
10. `private String name;`
11. 
12. `public Integer getId() {`
13. `return id;`
14. `}`
15. 
16. `public void setId(Integer id) {`
17. `this.id = id;`
18. `}`
19. 
20. `public String getName() {`
21. `return name;`
22. `}`
23. 
24. `public void setName(String name) {`
25. `this.name = name;`
26. `}`
27. 
28. `@Override`
29. `public String toString() {`
30. `return "Category [id=" + id + ", name=" + name + "]";`
31. `}`
32. `}`

数据库操作接口  
CategoryDao.java

1.  `package mybatis.curd.dao;`
2.  
3.  `import java.util.List;`
4.  
5.  `import mybatis.curd.model.Category;`
6.  
7.  `/**`
8.  `* 定义接口，与具体持久化操作无关`
9.  `*`
10. `* @author guxingke`
11. `* */`
12. `public interface CategoryDao {`
13. `public Category getCategory(Integer id);`
14. 
15. `public void saveCategory(Category category);`
16. 
17. `public void updateCategory(Category category);`
18. 
19. `public void deleteCategory(Integer id);`
20. 
21. `public List<Category> selectAll();`
22. 
23. `public List<Category> fuzzyQuery(String name);`
24. `}`

mybatis的持久化操作mapper映射文件  
category.xml

1.  `<?xml version="1.0" encoding="UTF-8" ?>`
2.  `<!DOCTYPE mapper`
3.  `PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"`
4.  `"http://mybatis.org/dtd/mybatis-3-mapper.dtd">`
5.  
6.  `<mapper namespace="mybatis.curd.dao.CategoryDao">`
7.  ``
8.  `<insert id="saveCategory" parameterType="Category">`
9.  `insert into`
10. `t_category(name) values(#{name})`
11. `</insert>`
12. ``
13. `<select id="getCategory" parameterType="int" resultType="Category">`
14. `select *`
15. `from t_category where id = #{id}`
16. `</select>`
17. ``
18. `<update id="updateCategory" parameterType="Category">`
19. `update t_category set`
20. `name = #{name} where id = #{id}`
21. `</update>`
22. ``
23. `<select id="selectAll" resultType="Category">`
24. `select * from t_category`
25. `</select>`
26. ``
27. `<select id="fuzzyQuery" resultType="Category" parameterType="java.lang.String">`
28. `select *`
29. `from t_category where name like "%"#{name}"%"`
30. `</select>`
31. ``
32. `<delete id="deleteCategory" parameterType="int">`
33. `delete from t_category`
34. `where`
35. `id = #{id}`
36. `</delete>`
37. `</mapper>`

测试mybatis3推荐的持久化操作方式  
CategoryDaoTest2.java

1.  `package mybatis.curd.dao;`
2.  
3.  `import java.util.List;`
4.  
5.  `import mybatis.curd.model.Category;`
6.  `import mybatis.curd.util.MybatisUtil;`
7.  
8.  `import org.apache.ibatis.session.SqlSession;`
9.  `import org.junit.After;`
10. `import org.junit.Before;`
11. `import org.junit.Test;`
12. 
13. `/**`
14. `* 测试mybatis3推荐的方式`
15. `*`
16. `* @author guxingke`
17. `* */`
18. `public class CategoryDaoTest2 {`
19. 
20. `@Test`
21. `public void testGetCategory() {`
22. `category = categoryDao.getCategory(1);`
23. `System.out.println(category);`
24. `}`
25. 
26. `@Test`
27. `public void testSaveCategory() {`
28. `category.setName("demo");`
29. `categoryDao.saveCategory(category);`
30. `}`
31. 
32. `@Test`
33. `public void testUpdateCategory() {`
34. `category.setId(3);`
35. `category.setName("test update id=3");`
36. `categoryDao.updateCategory(category);`
37. `}`
38. 
39. `@Test`
40. `public void testDeleteCategory() {`
41. `categoryDao.deleteCategory(2);`
42. `}`
43. 
44. `@Test`
45. `public void testSelectAll() {`
46. `List<Category> categories = categoryDao.selectAll();`
47. `for (Category category : categories) {`
48. `System.out.println(category);`
49. `}`
50. `}`
51. 
52. `@Test`
53. `public void testFuzzyQuery() {`
54. `List<Category> categories = categoryDao.fuzzyQuery("test");`
55. `for (Category category : categories) {`
56. `System.out.println(category);`
57. `}`
58. `}`
59. 
60. `@Before`
61. `public void setUp() {`
62. `session = MybatisUtil.getSqlSessionFactory().openSession();`
63. `category = new Category();`
64. `categoryDao = session.getMapper(CategoryDao.class);`
65. `}`
66. 
67. `@After`
68. `public void tearDown() {`
69. `session.commit();`
70. `session.close();`
71. `}`
72. 
73. `SqlSession session = null;`
74. `Category category = null;`
75. `CategoryDao categoryDao = null;`
76. `}`

测试mybatis3之前的持久化操作方式  
CategoryDaoTest.java

1.  `package mybatis.curd.dao;`
2.  
3.  `import java.util.List;`
4.  
5.  `import mybatis.curd.model.Category;`
6.  `import mybatis.curd.util.MybatisUtil;`
7.  
8.  `import org.apache.ibatis.session.SqlSession;`
9.  `import org.junit.After;`
10. `import org.junit.Before;`
11. `import org.junit.Test;`
12. 
13. `/**`
14. `* 测试mybatis3之前的操作方式`
15. `*`
16. `* @author guxingke`
17. `* */`
18. `public class CategoryDaoTest {`
19. 
20. `@Test`
21. `public void testGetCategory() {`
22. `category = session.selectOne(`
23. `"mybatis.curd.dao.CategoryDao.getCategory", 1);`
24. `System.out.println(category);`
25. `}`
26. 
27. `@Test`
28. `public void testSaveCategory() {`
29. `category.setName("curd");`
30. `session.insert("mybatis.curd.dao.CategoryDao.saveCategory", category);`
31. `}`
32. 
33. `@Test`
34. `public void testUpdateCategory() {`
35. `category.setName("update di =3");`
36. `category.setId(3);`
37. `session.update("mybatis.curd.dao.CategoryDao.updateCategory", category);`
38. `}`
39. 
40. `@Test`
41. `public void testDeleteCategory() {`
42. `session.delete("mybatis.curd.dao.CategoryDao.deleteCategory", 2);`
43. `}`
44. 
45. `@Test`
46. `public void testSelectAll() {`
47. `List<Category> categories = session`
48. `.selectList("mybatis.curd.dao.CategoryDao.selectAll");`
49. `for (Category category : categories) {`
50. `System.out.println(category);`
51. `}`
52. `}`
53. 
54. `@Test`
55. `public void testFuzzyQuery() {`
56. `List<Category> categories = session.selectList(`
57. `"mybatis.curd.dao.CategoryDao.fuzzyQuery", "y");`
58. `for (Category category : categories) {`
59. `System.out.println(category);`
60. `}`
61. `}`
62. 
63. `@Before`
64. `public void setUp() {`
65. `session = MybatisUtil.getSqlSessionFactory().openSession();`
66. `category = new Category();`
67. `}`
68. 
69. `@After`
70. `public void tearDown() {`
71. `session.commit();`
72. `session.close();`
73. `}`
74. 
75. `SqlSession session = null;`
76. `Category category = null;`
77. `}`

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