如何使用Jorm增删查改数据库

这篇文章主要介绍“如何使用JORM增删查改数据库”，在日常操作中，相信很多人在如何使用Jorm增删查改数据库问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何使用Jorm增删查改数据库”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

> 准备
以Mysql为例，执行下面的sql建立数据表
CREATE TABLE `t_user` (               
        `id` int(11) NOT NULL,              
        `name` varchar(50) DEFAULT NULL,    
        `sex` char(4) DEFAULT NULL,         
        `age` int(11) DEFAULT NULL,         
        `career` varchar(100) DEFAULT NULL, 
        PRIMARY KEY (`id`)                  
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

> 引入jar或Maven依赖，需要jar包
gerald-jorm-1.0.5.jar 最新版本下载：
commons-logging-1.1.1.jar
log4j-1.2.14.jar
mysql-connector-java-5.1.6.jar
javassist-3.11.0.GA.jar 或 cglib-nodep-2.2.2.jar (根据实际情况选择性加入)

> 配置文件
在你的java工程的classpath下建立config.properties和jdbc.cfg.xml文件
config.properties内容：
# 下面路径可以根据实际情况指定，为相对classpath的路径地址
jdbc.config.path=jdbc.cfg.xml

jdbc.cfg.xml内容：
<?xml version='1.0' encoding="UTF-8"?>
<jdbc-configuration>

  <constant name="show_sql" value="true" />
  <constant name="jdbc.batch_size" value="600" />
  <constant name="bytecode.provider" value="cglib" />
 
  <connections default="simple">
 
    <connection name="simple">
      <property name="connection.implementation">org.javaclub.jorm.jdbc.connection.impl.SimpleConnection</property>
      <property name="connection.dialect">MySQLDialect</property>
      <property name="connection.driver">com.mysql.jdbc.Driver</property>
      <property name="connection.jdbcurl">jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&amp;characterEncoding=UTF-8</property>
      <property name="connection.database">test</property>
      <property name="connection.username">root</property>
      <property name="connection.passWord">root</property>
    </connection>

    <connection name="c3p0">
      <property name="connection.implementation">org.javaclub.jorm.jdbc.connection.impl.PooledConnection</property>
      <property name="connection.dialect">MySQLDialect</property>
      <property name="connection.driver">com.mysql.jdbc.Driver</property>
      <property name="connection.jdbcurl">jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&amp;characterEncoding=UTF-8</property>
      <property name="connection.database">test</property>
      <property name="connection.username">root</property>
      <property name="connection.password">root</property>
      <property name="connection.pool.min">1</property>
      <property name="connection.pool.max">8</property>
      <property name="connection.test.sql">select 1</property>
    </connection>
   
  </connections>

</jdbc-configuration>

> 实体类User.java
@PK(value = "id")
@Entity(table="t_user")
public class User {
   
    @Id
    private int id;

    private String name;

    private String sex;

    private Integer age;

    private String career;
   
    @NoColumn
    private int kvalue;
   
    public User() {
        super();
    }

    public User(String name, String sex, Integer age, String career) {
        super();
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.career = career;
    }

    public User(Integer id, String name, String sex, Integer age, String career) {
        super();
        this.id = id;
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.career = career;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getCareer() {
        return career;
    }

    public void setCareer(String career) {
        this.career = career;
    }

    public int getKvalue() {
        return kvalue;
    }

    public void setKvalue(int kvalue) {
        this.kvalue = kvalue;
    }

    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("[" + id + ", " + name + ", " + sex + ", " + age + ", " + career + "]");
        return sb.toString();
    }

}

这里字段和java实体类User的属性在命名上是一致的，如果不一致，比如如果表创建sql为：
CREATE TABLE `t_user` (               
        `user_id` int(11) NOT NULL,              
        `user_name` varchar(50) DEFAULT NULL,    
        `sex` char(4) DEFAULT NULL,         
        `col_age` int(11) DEFAULT NULL,         
        `career_job` varchar(100) DEFAULT NULL, 
        PRIMARY KEY (`id`)                  
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

那么对应的实体User应该写成：
@PK(value = "id")
@Entity(table="t_user")
public class User {
   
    @Id
    @Column("user_id")
    private int id;

    @Column("user_name")
    private String name;
       
    // 与数据库字段命名一致，可以不指定@Column
    private String sex;

    @Column("col_age")
    private Integer age;

    @Column("career_job")
    private String career;
   
    @NoColumn
    private int kvalue;
   
    public User() {
        super();
    }

    public User(String name, String sex, Integer age, String career) {
        super();
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.career = career;
    }

    public User(Integer id, String name, String sex, Integer age, String career) {
        super();
        this.id = id;
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.career = career;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getCareer() {
        return career;
    }

    public void setCareer(String career) {
        this.career = career;
    }

    public int getKvalue() {
        return kvalue;
    }

    public void setKvalue(int kvalue) {
        this.kvalue = kvalue;
    }

    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("[" + id + ", " + name + ", " + sex + ", " + age + ", " + career + "]");
        return sb.toString();
    }

}

> 对User的增删查改，UserCrudTest.java，记得引入junit-4.8.2.jar
public class UserCrudTest {

    static Session session;
   
    @BeforeClass
    public static void before() {
        session = Jorm.getSession();
    }
   
    @AfterClass
    public static void after() {
        Jorm.free();
    }
   
    @Test
    public void save_user() {
        session.clean(User.class);
        User user = null;
        for (int i = 0; i < 600; i++) {
            String sex = (i % 2 == 0 ? "男" : "女");
            user = new User(Strings.fixed(5), sex, Numbers.random(98), Strings.random(8));
            session.save(user);
        }
    }
   
    @Test // 批量保存
    public void batch_save_user() {
        session.clean(User.class);
        JdbcBatcher batcher = session.createBatcher();
        User user = null;
        for (int i = 0; i < 600; i++) {
            String sex = (i % 2 == 0 ? "男" : "女");
            user = new User(Strings.fixed(5), sex, Numbers.random(98), Strings.random(8));
            batcher.save(user);
        }
        batcher.execute();
    }
   
    @Test
    public void loadUser() {
        User user = session.read(User.class, 1);
        // 这里user是一个代理对象，因为@Entity(table="t_user", lazy = true)
        System.out.println(user.getCareer());// 发出查询sql
    }
   
    @Test
    public void deletUser() {
        User user = session.read(User.class, 1);
        if(null != user) {
            session.delete(user);
        }
        user = session.read(User.class, 1);
        System.out.println(user);
    }
   
    @Test
    public void test_update_proxy() {
       
        User u;
        u = session.read(User.class, 2);
        Assert.assertNotNull(u);
        Assert.assertTrue(u instanceof JormProxy);
       
        u.setName("Gerald.Chen");
        session.update(u);
        System.out.println(u.getName());
        u = session.read(User.class, 2);
        Assert.assertTrue("Gerald.Chen".equals(u.getName()));
    }
   
    @Test
    public void queryUser() {
        SqlParams<User> params = new SqlParams<User>();
        params.setObjectClass(User.class);
        params.setFirstResult(8);
        params.setMaxResults(20);
        List<User> users = session.list(params);
        System.out.println(users.size());
        System.out.println(users);
    }
   
}

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