第一步，引用Maven依赖：

com.github.braisdom

objective-sql

1.3.4

第二步，使用Annotation 定义一个DomainModel ：

import com.github.braisdom.objsql.annotations.Column;

import com.github.braisdom.objsql.annotations.DomainModel;

import com.github.braisdom.objsql.annotations.Queryable;

import com.github.braisdom.objsql.annotations.Relation;

import com.github.braisdom.objsql.relation.RelationType;

import java.util.List;

@DomainModel

public class Member {

@Queryable

@Column(updatable = false)

private String no;

@Queryable

private String name;

private Integer gender;

private String mobile;

private String otherInfo;

@Relation(relationType = RelationType.HAS_MANY)

private List orders;

}

第三步：定义ConnectionFactory 并注入ObjectiveSQL:

private static class MySQLConnectionFactory implements ConnectionFactory {

@Override

public Connection getConnection(String dataSourceName) throws SQLException {

String url = "jdbc:mysql://localhost:4406/objective_sql?serverTimezone=Asia/Shanghai";

String user = "root";

String password = "123456";

Connection connection;

try {

Class.forName("com.mysql.cj.jdbc.Driver").newInstance();

connection = DriverManager.getConnection(url, user, password);

} catch (InstantiationException | IllegalAccessException | ClassNotFoundException ex) {

throw new IllegalStateException(ex.getMessage(), ex);

}

return connection;

}

}

Databases.installConnectionFactory(new MySQLConnectionFactory());

第四步：执行数据库操作

1) 创建会员

Member newMember = new Member();

newMember.setNo("100000")

.setName("Pamela")

.setGender(1)

.setRegisteredAtWithJoda(DateTime.now())

.setUpdatedAt(Timestamp.valueOf("2020-10-05 00:00:00"))

.setMobile("15011112222");

Member member = Member.create(newMember, true);

INSERT INTO `members` (`no`,`name`,`gender`,`mobile`,`extended_attributes`,`registered_at`,`updated_at`)

VALUES (?,?,?,?,?,?,?), with: [100000,Pamela,1,15011112222,null,2020-10-08 11:01:57.368,2020-10-05 00:00:00.0]

2) 统计会员数量

long count = Member.count("id > ?", 10);

SELECT COUNT(*) AS count_rows FROM `members`