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v1.0.0 rc1 release
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开源海哥
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111
readme.md
111
readme.md
@ -68,76 +68,44 @@ class HelloWorld {
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e.g.2: query list
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```java
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class HelloWorld {
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public static void main(String... args) {
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//use QueryWrapper to build query conditions
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("zhang").or(ACCOUNT.USER_NAME.like("li")));
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HikariDataSource dataSource = new HikariDataSource();
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dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex");
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dataSource.setUsername("username");
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dataSource.setPassword("password");
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MybatisFlexBootstrap.getInstance()
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.setDatasource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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//use QueryWrapper to build query conditions
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("zhang").or(ACCOUNT.USER_NAME.like("li")));
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// execute SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%zhang%' OR `tb_account`.`user_name` LIKE '%li%' )
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List<Account> accounts = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.selectListByQuery(query)
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);
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}
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}
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// execute SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%zhang%' OR `tb_account`.`user_name` LIKE '%li%' )
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List<Account> accounts = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.selectListByQuery(query)
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);
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```
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e.g.3: paging query
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```java
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class HelloWorld {
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public static void main(String... args) {
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//use QueryWrapper to build query conditions
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("zhang").or(ACCOUNT.USER_NAME.like("li")))
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.orderBy(ACCOUNT.ID.desc());
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HikariDataSource dataSource = new HikariDataSource();
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dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex");
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dataSource.setUsername("username");
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dataSource.setPassword("password");
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MybatisFlexBootstrap.getInstance()
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.setDatasource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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//use QueryWrapper to build query conditions
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("zhang").or(ACCOUNT.USER_NAME.like("li")))
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.orderBy(ACCOUNT.ID.desc());
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// execute SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%zhang%' OR `tb_account`.`user_name` LIKE '%li%' )
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// ORDER BY `tb_account`.`id` DESC
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// LIMIT 40,10
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Page<Account> accountPage = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.paginate(5, 10, query)
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);
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}
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}
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// execute SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%zhang%' OR `tb_account`.`user_name` LIKE '%li%' )
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// ORDER BY `tb_account`.`id` DESC
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// LIMIT 40,10
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Page<Account> accountPage = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.paginate(5, 10, query)
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);
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```
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## QueryWrapper Samples
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@ -223,7 +191,7 @@ QueryWrapper queryWrapper=QueryWrapper.create()
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// SELECT * FROM tb_account
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// WHERE tb_account.id >= ?
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// AND EXIST (
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// SELECT 1 FROM tb_article WHERE tb_article.id >= ?
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// SELECT 1 FROM tb_article WHERE tb_article.id >= ?
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// )
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```
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@ -272,6 +240,21 @@ QueryWrapper queryWrapper=QueryWrapper.create()
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// HAVING tb_account.age BETWEEN ? AND ?
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```
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### orderBy
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```java
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QueryWrapper queryWrapper=QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.orderBy(ACCOUNT.AGE.asc(), ACCOUNT.USER_NAME.desc().nullsLast());
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// SQL:
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// SELECT * FROM `tb_account`
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// ORDER BY `age` ASC, `user_name` DESC NULLS LAST
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```
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### join
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```java
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QueryWrapper queryWrapper = QueryWrapper.create()
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33
readme_zh.md
33
readme_zh.md
@ -306,31 +306,31 @@ Db + Row 工具类，提供了在 Entity 实体类之外的数据库操作能力
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```java
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//使用原生 SQL 插入数据
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String sql="insert into tb_account(id,name) value (?, ?)";
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Db.insertBySql(sql,1,"michael");
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Db.insertBySql(sql,1,"michael");
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//使用 Row 插入数据
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Row account=new Row();
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account.set("id",100);
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account.set("name","Michael");
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Db.insertRow("tb_account",account);
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Row account=new Row();
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account.set("id",100);
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account.set("name","Michael");
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Db.insertRow("tb_account",account);
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//根据主键查询数据
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Row row=Db.selectOneById("tb_account","id",1);
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Row row=Db.selectOneById("tb_account","id",1);
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//Row 可以直接转换为 Entity 实体类，且性能极高
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Account account=row.toEntity(Account.class);
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Account account=row.toEntity(Account.class);
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//查询所有大于 18 岁的用户
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String listsql="select * from tb_account where age > ?"
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List<Row> rows=Db.selectListBySql(sql,18);
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String listsql="select * from tb_account where age > ?"
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List<Row> rows=Db.selectListBySql(sql,18);
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//分页查询：每页 10 条数据，查询第 3 页的年龄大于 18 的用户
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QueryWrapper query=QueryWrapper.create()
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.where(ACCOUNT.AGE.ge(18));
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Page<Row> rowPage=Db.paginate("tb_account",3,10,query);
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QueryWrapper query=QueryWrapper.create()
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.where(ACCOUNT.AGE.ge(18));
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Page<Row> rowPage=Db.paginate("tb_account",3,10,query);
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```
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> Db 工具类还提供了更多 增、删、改、查和分页查询等方法。
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@ -354,23 +354,22 @@ update(T entity,boolean ignoreNulls)
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```java
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Account account=UpdateEntity.of(Account.class);
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account.setId(1);
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account.setId(100);
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account.setUserName(null);
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account.setSex(1);
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accountMapper.update(account,false);
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```
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以上的示例中，会把 id 为 1 这条数据中的 user_name 字段更新为 null，sex 字段更新为 1，其他字段不会被更新。也就是说，通过 `UpdateEntity`
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以上的示例中，会把 id 为 100 这条数据中的 user_name 字段更新为 null，sex 字段更新为 1，其他字段不会被更新。也就是说，通过 `UpdateEntity`
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创建的对象，只会更新调用了 setter 方法的字段，若不调用 setter 方法，不管这个对象里的属性的值是什么，都不会更新到数据库。
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其生成的 sql 内容如下：
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```sql
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update tb_account
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set user_name = ?,
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sex = ?
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where id = ? #params: null,1,1
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set user_name = ?, sex = ? where id = ?
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#params: null,1,100
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```
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## 多主键
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