Mybatis-Flex之基础查询

1、selectOneById

/**
     * selectOneById(id)：根据主键查询数据。
     */
    @Test
    public void testSelectOneById() {
        /**
         * SELECT * FROM `tb_account` WHERE `id` = ?
         */
        Account account = accountMapper.selectOneById(10L);
        System.out.println("account = " + account);
    }

2、selectOneByMap

/**
     * selectOneByMap(whereConditions)：根据 Map 构建的条件来查询数据。查出满足条件的一条数据
     */
    @Test
    public void testSelectOneByMap() {
        Map<String, Object> condition = Map.of("age", 20);
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `tb_account`.`user_name` = ? LIMIT 1
         */
        Account account = accountMapper.selectOneByMap(condition);
        Assertions.assertNotNull(account, "用户名不存在");
    }

3、selectOneByCondition

/**
     * selectOneByCondition(whereConditions)：根据查询条件查询数据。
     */
    @Test
    public void testSelectOneByCondition() {
        QueryWrapper wrapper = QueryWrapper.create()
                .select(ACCOUNT.AGE, ACCOUNT.ID, ACCOUNT.BIRTHDAY, ACCOUNT.USER_NAME)
                .from(ACCOUNT)
                .where(ACCOUNT.AGE.eq(20));
        /**
         * 查出多条记录会报错
         * SELECT `age`, `id`, `birthday`, `user_name` FROM `tb_account` WHERE `age` = ?
         */
        Account account = accountMapper.selectOneByQuery(wrapper);
        Assertions.assertNotNull(account);
    }

4、获取表名、列名

/**
     * 获取表名、列名
     */
    @Test
    public void testGetTableName() {
        // String schema = ();
        // ("schema = " + schema);
        // 表名
        String tableName = ACCOUNT.getTableName();
        System.out.println("tableName = " + tableName);

        // 列名
        String columnName = ACCOUNT.AGE.getName();
        System.out.println("columnName = " + columnName);
    }

5、selectOneByQuery

/**
     * selectOneByQuery(queryWrapper)：根据查询条件来查询 1 条数据。
     */
    @Test
    public void testSelectOneByQuery() {
        QueryWrapper wrapper = QueryWrapper.create()
                .select(Account::getUserName)
                .from(ACCOUNT)
                .where(ACCOUNT.ID.eq(15));
        /**
         * SELECT `user_name` FROM `tb_account` WHERE `id` = ?
         */
        Account account = accountMapper.selectOneByQuery(wrapper);
        Assertions.assertNotNull(account);
    }

6、selectOneByQueryAs

/**
     * selectOneByQueryAs(queryWrapper, asType)：根据查询条件来查询 1 条数据。
     */
    @Test
    public void testSelectOneByQueryAs() {
        QueryWrapper wrapper = QueryWrapper.create()
                .select(Account::getUserName)
                .from(ACCOUNT)
                .where(ACCOUNT.ID.eq(10));
        /**
         * SELECT `user_name` FROM `tb_account` WHERE `id` = ?
         */
        AccountDTO accountDTO = accountMapper.selectOneByQueryAs(wrapper, AccountDTO.class);
        // accountDTO = AccountDTO(age=null, userName=UpdateEntity2)
        System.out.println("accountDTO = " + accountDTO);
        Assertions.assertNotNull(accountDTO);
    }

7、selectOneWithRelationsByMap

 /**
     * selectOneWithRelationsByMap(whereConditions)：根据 Map 构建的条件来查询 1 条数据。
     */
    @Test
    public void testSelectOneWithRelationsByMap() {
        Map<String, Object> condition = Map.of("age", 20);
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `tb_account`.`age` = ? LIMIT 1
         */
        Account account = accountMapper.selectOneWithRelationsByMap(condition);
        System.out.println("account = " + account);
        Assertions.assertNotNull(account);
    }

8、selectOneWithRelationsByCondition

/**
     * selectOneWithRelationsByCondition(whereConditions)：根据查询条件查询 1 条数据。
     */
    @Test
    public void testSelectOneWithRelationsByCondition() {
        QueryCondition condition = ACCOUNT.ID.eq(10L);
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `id` = ? LIMIT 1
         */
        Account account = accountMapper.selectOneWithRelationsByCondition(condition);
        Assertions.assertNotNull(account);
    }

9、selectOneWithRelationsByQuery

/**
     * selectOneWithRelationsByQuery(queryWrapper)：根据查询条件来查询 1 条数据。
     */
    @Test
    public void testSelectOneWithRelationsByQuery() {
        QueryWrapper wrapper = QueryWrapper.create().select(Account::getId, Account::getUserName)
                .from(ACCOUNT)
                .where(ACCOUNT.ID.ge(6))
                .orderBy(Account::getBirthday)
                .asc()
                .limit(1);
        /**
         * SELECT `id`, `user_name` FROM `tb_account` WHERE `id` >= ? ORDER BY `birthday` ASC LIMIT 1
         */
        Account account = accountMapper.selectOneWithRelationsByQuery(wrapper);
        Assertions.assertNotNull(account);
    }

10、selectOneWithRelationsByQueryAs

/**
     * selectOneWithRelationsByQueryAs(queryWrapper, asType)：根据查询条件来查询 1 条数据。
     */
    @Test
    public void testSelectOneWithRelationsByQueryAs() {
        QueryWrapper wrapper = QueryWrapper.create().select(ACCOUNT.DEFAULT_COLUMNS)
                .from(ACCOUNT)
                .where(ACCOUNT.ID.ge(6))
                .groupBy(ACCOUNT.ID)
                .having(ACCOUNT.AGE.le(30))
                .orderBy(Account::getBirthday)
                .desc()
                .limit(1);
        /**
         * SELECT `id`, `age`, `birthday`, `user_name` FROM `tb_account` WHERE `id` >= ? GROUP BY `id` HAVING `age` <= ? ORDER BY `birthday` DESC LIMIT 1
         */
        AccountDTO accountDTO = accountMapper.selectOneWithRelationsByQueryAs(wrapper, AccountDTO.class);
        Assertions.assertNotNull(accountDTO);
    }

11、selectListByIds

 /**
     * selectListByIds(ids)：根据多个主键来查询多条数据。
     */
    @Test
    public void testSelectListByIds() {
        List<Integer> ids = List.of(2, 4, 6, 8, 10);
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `id` = ? OR `id` = ? OR `id` = ? OR `id` = ? OR `id` = ?
         */
        List<Account> accounts = accountMapper.selectListByIds(ids);
        Assertions.assertTrue(accounts.size() > 0);
        System.out.println("accounts = " + accounts);
    }

12、selectListByMap

/**
     * selectListByMap(whereConditions)：根据 Map 来构建查询条件，查询多条数据。
     */
    @Test
    public void testSelectListByMap() {
        // 注意这里的key要和数据库的列名column对应
        Map<String, Object> condition = Map.of("age", 20, "user_name", "zs");
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `tb_account`.`user_name` = ? AND `tb_account`.`age` = ?
         */
        List<Account> accounts = accountMapper.selectListByMap(condition);
        Assertions.assertTrue(accounts.size() > 0);
        System.out.println("accounts = " + accounts);
    }

13、selectListByMap

/**
     * selectListByMap(whereConditions, count)：根据 Map 来构建查询条件，查询多条数据。
     */
    @Test
    public void testSelectListByMapAndCount() {
        int count = 2;
        Map<String, Object> condition = Map.of("age", 20);
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `tb_account`.`age` = ? LIMIT 2
         */
        List<Account> accounts = accountMapper.selectListByMap(condition, count);
        Assertions.assertEquals(2, accounts.size());
        System.out.println("accounts = " + accounts);
    }

14、selectListByCondition

/**
     * selectListByCondition(whereConditions)：根据查询条件查询多条数据。
     */
    @Test
    public void testSelectListByCondition() {
        QueryCondition condition = ACCOUNT.ID.eq(5).and(ACCOUNT.AGE.ge(20));
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `id` = ? AND `age` >= ?
         */
        List<Account> accounts = accountMapper.selectListByCondition(condition);
        Assertions.assertTrue(accounts.size() > 0);
        System.out.println("accounts = " + accounts);
    }

15、selectListByCondition

/**
     * selectListByCondition(whereConditions, count)：根据查询条件查询多条数据。
     */
    @Test
    public void testSelectListByConditionAndCount() {
        QueryCondition condition = ACCOUNT.ID.eq(5).and(ACCOUNT.AGE.ge(20));
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `id` = ? AND `age` >= ? LIMIT 2
         */
        List<Account> accounts = accountMapper.selectListByCondition(condition, 2);
        Assertions.assertEquals(2, accounts.size());
        System.out.println("accounts = " + accounts);
    }

16、selectListByQuery

 /**
     * selectListByQuery(queryWrapper)：根据查询条件查询数据列表。
     */
    @Test
    public void testSelectListByQuery() {
        /**
         * SELECT * FROM `tb_account` WHERE id >= 10
         */
        List<Account> accounts = accountMapper.selectListByQuery(QueryWrapper.create().select(ACCOUNT.ALL_COLUMNS).from(ACCOUNT).where("id >= " + 10));
        Assertions.assertTrue(accounts.size() > 0);
    }

17、selectListByQuery

/**
     * selectListByQuery(queryWrapper, consumers)：根据查询条件查询数据列表。
     */
    @Test
    public void testSelectListByQueryAndConsumers() {
        // 暂时没整明白consumers参数的用处
        Consumer<FieldQueryBuilder<Account>> consumer = (builder) -> {
            builder.nestedField(Account::getUserName);
        };
        /**
         * SELECT * FROM `tb_account` WHERE `age` >= ?
         */
        List<Account> accounts = accountMapper.selectListByQuery(QueryWrapper.create().select(ACCOUNT.ALL_COLUMNS)
                .from(ACCOUNT).where(ACCOUNT.AGE.ge(15)), consumer);
        Assertions.assertTrue(accounts.size() > 0);
        System.out.println("accounts = " + accounts);
    }

18、selectCursorByQuery

/**
     * selectCursorByQuery(queryWrapper)：根据查询条件查询游标数据，该方法必须在事务中才能正常使用，非事务下无法获取数据。
     */
    @Transactional
    @Test
    public void testSelectCursorByQuery() {
        /**
         * SELECT * FROM `tb_account` WHERE `age` <= ?
         */
        Cursor<Account> accounts = accountMapper.selectCursorByQuery(QueryWrapper.create().select(ACCOUNT.ALL_COLUMNS).from(ACCOUNT).where(ACCOUNT.AGE.le(18)));
        accounts.forEach(item -> {
            System.out.println("item = " + item);
        });
        Assertions.assertNotNull(accounts);
    }

19、selectRowsByQuery

/**
     * selectRowsByQuery(queryWrapper)：根据查询条件查询 Row 数据。
     */
    @Test
    public void testSelectRowsByQuery() {
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE `user_name` = ?
         */
        List<Row> rows = accountMapper.selectRowsByQuery(QueryWrapper.create().where(ACCOUNT.USER_NAME.eq("zs")));
        rows.stream().parallel().forEach(item -> {
            Object id = item.get("id");
            System.out.println("id = " + id);
            System.out.println("item = " + item);
        });
        Assertions.assertTrue(rows.size() > 0);
        System.out.println("rows = " + rows);
    }

20、selectListByQueryAs

/**
     * selectListByQueryAs(queryWrapper, asType)：根据查询条件查询数据列表，要求返回的数据为 asType。这种场景一般用在 left join 时，有多出了实体类本身的字段内容，可以转换为 dto、vo 等场景
     */
    @Test
    public void testSelectListByQueryAs() {
        /**
         *SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account` WHERE age >=20
         */
        List<AccountDTO> accountDTOS = accountMapper.selectListByQueryAs(QueryWrapper.create().where("age >=" + 20), AccountDTO.class);
        Assertions.assertTrue(accountDTOS.size() > 0);
        System.out.println("accountDTOS = " + accountDTOS);
    }

21、selectAll

/**
     * selectAll()：查询全部数据。
     */
    @Test
    public void testSelectAll() {
        /**
         * SELECT `id`, `user_name`, `age`, `birthday` FROM `tb_account`
         */
        List<Account> accounts = accountMapper.selectAll();
        Assertions.assertTrue(accounts.size() > 0);
        System.out.println("accounts = " + accounts);
    }

22、selectObjectByQuery

 /**
     * selectObjectByQuery(queryWrapper)：查询第一列返回的数据，QueryWrapper 执行的结果应该只有 1 列，例如：().select().where(...);
     */
    @Test
    public void testSelectObjectByQuery() {
        String where = String.format("id = %d", 10);
        QueryWrapper wrapper = QueryWrapper.create().select(ACCOUNT.USER_NAME).where(where);
        /**
         *  SELECT `user_name` FROM `tb_account` WHERE id = 10
         */
        String userName = (String) accountMapper.selectObjectByQuery(wrapper);
        Assertions.assertNotNull(StringUtil.trimOrNull(userName));
        System.out.println("userName = " + userName);
    }

23、selectObjectByQueryAs

/**
     * selectObjectByQueryAs(queryWrapper, asType)：查询第一列返回的数据，QueryWrapper 执行的结果应该只有 1 列，例如：().select().where(...);
     */
    @Test
    public void testSelectObjectByQueryAs() {
        String where = String.format("id = %d", 10);
        /**
         * SELECT `user_name` FROM `tb_account` WHERE id = 10
         */
        QueryWrapper wrapper = QueryWrapper.create().select(ACCOUNT.USER_NAME).where(where);
        String res = accountMapper.selectObjectByQueryAs(wrapper, String.class);
        Assertions.assertNotNull(res);
        System.out.println("res = " + res);
    }

24、selectObjectListByQuery

/**
     * selectObjectListByQuery(queryWrapper)：查询第一列返回的数据集合，QueryWrapper 执行的结果应该只有 1 列，例如：().select().where(...);
     */
    @Test
    public void testSelectObjectListByQuery() {
        /**
         * SELECT `age` FROM `tb_account` WHERE `age` = ?
         */
        List<Object> objects = accountMapper.selectObjectListByQuery(QueryWrapper.create().select(ACCOUNT.AGE).where(ACCOUNT.AGE.eq(20)));
        Assertions.assertNotNull(objects);
        Assertions.assertTrue(objects.size() > 0);
        System.out.println("objects = " + objects);
    }

25、testSelectObjectListByQueryAs

/**
     * selectObjectListByQueryAs(queryWrapper, asType)：查询第一列返回的数据集合，QueryWrapper 执行的结果应该只有 1 列，例如：().select().where(...);
     */
    @Test
    public void testSelectObjectListByQueryAs() {
        /**
         * SELECT `user_name` FROM `tb_account` WHERE `age` = ?
         */
        List<String> userNameList = accountMapper.selectObjectListByQueryAs(QueryWrapper.create().select(ACCOUNT.USER_NAME).where(ACCOUNT.AGE.eq(20)), String.class);
        Assertions.assertNotNull(userNameList);
        Assertions.assertTrue(userNameList.size() > 0);
        System.out.println("userNameList = " + userNameList);
    }

26、selectCountByQuery

/**
     * selectCountByQuery(queryWrapper)：查询数据量。
     */
    @Test
    public void testSelectCountByQuery() {
        /**
         * SELECT COUNT(*) FROM `tb_account` WHERE `id` > ?
         */
        long count = accountMapper.selectCountByQuery(QueryWrapper.create().select(ACCOUNT.ID));
        Assertions.assertTrue(count > 0);
        System.out.println("count = " + count);
    }

27、selectCountByCondition

/**
     * selectCountByCondition(whereConditions)：根据条件查询数据总量。
     */
    @Test
    public void test() {
        long count = accountMapper.selectCountByCondition(ACCOUNT.ID.ge(0));
        Assertions.assertTrue(count > 0);
        System.out.println("count = " + count);
    }