代码拉取完成,页面将自动刷新
同步操作将从 tanghc/easymybatis 强制同步,此操作会覆盖自 Fork 仓库以来所做的任何修改,且无法恢复!!!
确定后同步将在后台操作,完成时将刷新页面,请耐心等待。
easymybatis是一个mybatis增强类库,目的为简化mybatis的开发,让开发更高效。
entity文件 TUser.java
@Table(name = "t_user")
public class TUser {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@Column(name = "username")
private String username;
@Column(name = "state")
private Byte state;
@Column(name = "isdel")
private Boolean isdel;
@Column(name = "remark")
private String remark;
@Column(name = "add_time")
private Date addTime;
@Column(name = "money")
private BigDecimal money;
@Column(name = "left_money")
private Float leftMoney;
// 省略get set
}
dao文件 TUserDao.java.Dao层简单继承即可,表示这个dao具有CRUD功能
public interface TUserDao extends CrudDao<TUser> {
}
测试文件 TUserDaoTest.java
// 根据主键查询
@Test
public void testGet() {
TUser user = dao.get(3);
print(user);
}
// 根据字段查询一条记录
@Test
public void testGetByProperty() {
TUser user = dao.getByProperty("username", "王五");
print(user);
}
// 根据条件查询一条记录
@Test
public void testGetByExpression() {
// 查询ID=3的用户
Query query = Query.build().eq("id", 3);
TUser user = dao.getByExpression(query);
print(user);
}
// 条件查询
// 查询username='张三'的用户
@Test
public void testFind() {
Query query = new Query();
// 添加查询条件
query.eq("username", "张三");
List<TUser> list = dao.find(query); // 获取结果集
long count = dao.countTotal(query); // 获取总数
print("count:" + count);
for (TUser user : list) {
System.out.println(user);
}
}
// 分页查询,支持mysql,sqlserver2005+,oracle
@Test
public void testPage() {
Query query = new Query();
query.setPage(2, 2) // 设置pageIndex,pageSize
.addSort("id", "desc"); // 添加排序
;
// 查询后的结果,包含总记录数,结果集,总页数等信息
PageInfo<TUser> pageInfo = QueryUtils.query(dao, query);
List<TUser> rows = pageInfo.getList();
for (TUser user : rows) {
System.out.println(user);
}
}
// 自定义返回字段查询,只返回两个字段
// SELECT t.id,t.username FROM `t_user` t LIMIT 0,10
@Test
public void testSelfColumns() {
Query query = new Query();
// 只返回id,username
query.setColumns(Arrays.asList("t.id","t.username"));
List<TUser> list = dao.find(query);
for (TUser user : list) {
System.out.println(user);
}
}
// 多表查询,left join
// 适用场景:获取两张表里面的字段信息返回给前端
/*
* MYSQL生成如下sql:
SELECT
t.`id` , t.`username` , t.`state` , t.`isdel` , t.`remark`
, t.`add_time` , t.`money` , t.`left_money`
, t2.city , t2.address
FROM `t_user` t left join user_info t2 on t.id = t2.user_id
WHERE t2.id = ?
ORDER BY id ASC
LIMIT ?,?
*/
@Test
public void testJoin() {
Query query = new Query();
// 添加第二张表的字段,跟主表字段一起返回
query.addOtherColumns(
"t2.city"
,"t2.address"
);
// 左连接查询,主表的alias默认为t
query.join("left join user_info t2 on t.id = t2.user_id");
//添加条件
query.eq("t2.id", 2);
query.addSort("t.id");
List<TUser> list = dao.find(query);
System.out.println("==============");
for (TUser user : list) {
System.out.println(
user.getId()
+ " " + user.getUsername()
// 下面两个字段是第二张表里面的
+ " " + user.getCity()
+ " " + user.getAddress()
);
}
System.out.println("==============");
}
/*
* 聚合查询
* 按state分组统计money和,并且按照state升序
* 并且money大于200的state
*
* SELECT
* state AS s , SUM(money) AS m
* FROM `t_user` t
* WHERE money > 0
* GROUP BY state
* HAVING m > 200
* ORDER BY state asc
*/
@Test
public void testProjection() {
ProjectionQuery query = new ProjectionQuery();
// 添加列
query.addProjection(Projections.column("state", "s"));
query.addProjection(Projections.sum("money", "m"));
// 添加where
query.addExpression(new ValueExpression("money",">",0));
// 添加group by
query.addGroupBy("state");
// 添加having
query.addHaving(new ValueExpression("SUM(money)", ">" ,200));
query.addSort("state", "asc");
List<Map<String, Object>> list = dao.findProjection(query);
Assert.notEmpty(list);
print(list);
}
// 自定义sql,见TUserDao.xml
// 注意mapper文件名必须跟Dao类一致
@Test
public void testSelfSql() {
TUser user = dao.selectByName("张三");
print(user);
}
// 添加-保存所有字段
@Test
public void testInsert() {
TUser user = new TUser();
user.setAddTime(new Date());
user.setIsdel(false);
user.setLeftMoney(22.1F);
user.setMoney(new BigDecimal(100.5));
user.setRemark("备注");
user.setState((byte)0);
user.setUsername("张三");
dao.save(user);
print("添加后的主键:" + user.getId());
print(user);
}
// 添加-保存非空字段
@Test
public void testInsertIgnoreNull() {
TUser user = new TUser();
user.setAddTime(new Date());
user.setIsdel(true);
user.setMoney(new BigDecimal(100.5));
user.setState((byte)0);
user.setUsername("张三notnull");
user.setLeftMoney(null);
user.setRemark(null);
dao.saveIgnoreNull(user);
print("添加后的主键:" + user.getId());
print(user);
}
// 批量添加
/*
* 支持mysql,sqlserver2008。如需支持其它数据库使用saveMulti方法
* INSERT INTO person (id, name, age)
VALUES
(1, 'Kelvin', 22),
(2, 'ini_always', 23);
*/
@Test
public void testInsertBatch() {
List<TUser> users = new ArrayList<>();
for (int i = 0; i < 3; i++) { // 创建3个对象
TUser user = new TUser();
user.setUsername("username" + i);
user.setMoney(new BigDecimal(i));
user.setRemark("remark" + i);
user.setState((byte)0);
user.setIsdel(false);
user.setAddTime(new Date());
user.setLeftMoney(200F);
users.add(user);
}
int i = dao.saveBatch(users); // 返回成功数
System.out.println("saveBatch --> " + i);
}
/**
* 批量添加,兼容更多数据库版本,采用union all
* INSERT INTO [t_user] ( [username] , [state] , [isdel]
, [remark] , [add_time] , [money] , [left_money] )
* SELECT ? , ? , ? , ? , ? , ? , ?
* UNION ALL SELECT ? , ? , ? , ? , ? , ? , ?
* UNION ALL SELECT ? , ? , ? , ? , ? , ? , ?
*/
@Test
public void testInsertMulti() {
List<TUser> users = new ArrayList<>();
for (int i = 0; i < 3; i++) { // 创建3个对象
TUser user = new TUser();
user.setUsername("username" + i);
user.setMoney(new BigDecimal(i));
user.setRemark("remark" + i);
user.setState((byte)3);
user.setIsdel(false);
user.setAddTime(new Date());
user.setLeftMoney(200F);
users.add(user);
}
int i = dao.saveMulti(users); // 返回成功数
System.out.println("saveMulti --> " + i);
}
// 批量添加指定字段,仅支持msyql,sqlserver2008,如需支持其它数据库使用saveMulti方法
@Test
public void testInsertBatchWithColumns() {
List<TUser> users = new ArrayList<>();
for (int i = 0; i < 3; i++) { // 创建3个对象
TUser user = new TUser();
user.setUsername("usernameWithColumns" + i);
user.setMoney(new BigDecimal(i));
user.setAddTime(new Date());
users.add(user);
}
/*
* INSERT INTO `t_user` ( username , money , add_time )
* VALUES ( ? , ? , ? ) , ( ? , ? , ? ) , ( ? , ? , ? )
*/
int i= dao.saveBatchWithColumns(Arrays.asList(
new Column("username", "username") // 第一个是数据库字段,第二个是java字段
,new Column("money", "money")
,new Column("add_time", "addTime")
), users);
System.out.println("saveBatchWithColumns --> " + i);
}
/*
* // 批量添加指定字段,兼容
* INSERT INTO [t_user] ( [username] , [money] , [add_time] )
* SELECT ? , ? , ?
* UNION ALL SELECT ? , ? , ?
* UNION ALL SELECT ? , ? , ?
*/
@Test
public void testInsertMultiWithColumns() {
List<TUser> users = new ArrayList<>();
for (int i = 0; i < 3; i++) { // 创建3个对象
TUser user = new TUser();
user.setUsername("usernameWithColumns" + i);
user.setMoney(new BigDecimal(i));
user.setAddTime(new Date());
users.add(user);
}
int i= dao.saveMultiWithColumns(Arrays.asList(
new Column("username", "username") // 第一个是数据库字段,第二个是java字段
,new Column("money", "money")
,new Column("add_time", "addTime")
), users);
System.out.println("saveMultiWithColumns --> " + i);
}
// 更新所有字段
@Test
public void testUpdate() {
TUser user = dao.get(3);
user.setUsername("李四");
user.setMoney(user.getMoney().add(new BigDecimal(0.1)));
user.setIsdel(true);
int i = dao.update(user);
print("testUpdate --> " + i);
}
// 更新不为null的字段
/*
*UPDATE [t_user] SET [username]=?, [isdel]=? WHERE [id] = ?
*/
@Test
public void updateIgnoreNull() {
TUser user = new TUser();
user.setId(3);
user.setUsername("王五");
user.setIsdel(false);
int i = dao.updateIgnoreNull(user);
print("updateNotNull --> " + i);
}
// 根据条件更新
// UPDATE t_user SET remark = '批量修改备注' WHERE state = 0
@Test
public void testUpdateNotNullByExpression() {
Query query = new Query();
query.eq("state", 0);
TUser user = new TUser();
user.setRemark("批量修改备注");
int i = dao.updateIgnoreNullByExpression(user, query);
print("testUpdateNotNullByExpression --> " + i);
}
// 删除
@Test
public void testDel() {
TUser user = new TUser();
user.setId(14);
int i = dao.del(user);
print("del --> " + i);
}
// 根据条件删除
// DELETE FROM `t_user` WHERE state = ?
@Test
public void delByExpression() {
Query query = new Query();
query.eq("state", 3);
int i = dao.delByExpression(query);
print("delByExpression --> " + i);
}
更多列子可以查看demo中的测试用例。
maven依赖:
<dependency>
<groupId>net.oschina.durcframework</groupId>
<artifactId>easymybatis</artifactId>
<version>最新版本</version>
</dependency>
替换org.mybatis.spring.SqlSessionFactoryBean即可
<!-- 替换SqlSessionFactoryBean -->
<bean id="sqlSessionFactory"
class="net.oschina.durcframework.easymybatis.ext.SqlSessionFactoryBeanExt">
<property name="dataSource" ref="dataSource" />
<property name="configLocation">
<value>classpath:mybatis/mybatisConfig.xml</value>
</property>
<property name="mapperLocations">
<list>
<value>classpath:mybatis/mapper/*.xml</value>
</list>
</property>
<!-- dao所在的包名,跟MapperScannerConfigurer的basePackage一致
多个用;隔开
-->
<property name="basePackage" value="com.myapp.dao" />
</bean>
QQ群:328419269
此处可能存在不合适展示的内容,页面不予展示。您可通过相关编辑功能自查并修改。
如您确认内容无涉及 不当用语 / 纯广告导流 / 暴力 / 低俗色情 / 侵权 / 盗版 / 虚假 / 无价值内容或违法国家有关法律法规的内容,可点击提交进行申诉,我们将尽快为您处理。