Slardar is a frame of data persistence layer,whitch features are similar to mybatis , hibernate etc... Slardar use javascript to build dynamic sql,whitch is easier for some one who familiar with javascript. It also provides annotaions to build relational mapping. Simplicity is the biggest advantage of the Slardar data mapper over object relational mapping tools.
- use javascript to build dynamic sql。
- support simple inerface define to map your sql, or simply use native jdbc interface.
- connection pool is supported by default, or the third pool (now contains DBCP and Druid)
<dependency>
<groupId>org.easyarch</groupId>
<artifactId>slardar</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>Assume you have a table named: t_user. A query demo like this:
First create a class: java User
package org.easyarch.test.pojo;
import org.easyarch.slardar.annotation.entity.Column;
import org.easyarch.slardar.annotation.entity.Table;
@Table(tableName = "user")
public class User {
@Column(name = "client_id")
private String clientId;
@Column(name = "username")
private String userName;
@Column(name = "password")
private String password;
@Column(name = "phone")
private String phone;
public String getClientId() {
return clientId;
}
public void setClientId(String clientId) {
this.clientId = clientId == null ? null : clientId.trim();
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
}Then you finish object-relational mapping,next to create an mapper:
package org.easyarch.test.dao;
import org.easyarch.slardar.annotation.sql.SqlParam;
import org.easyarch.test.pojo.User;
import java.util.List;
public interface UserMapper {
public User findById(@SqlParam(name = "id") String id);
public List<User> findByUser(User user);
}Use slardar's api: java DBSession,
create a class:
public class UserService {
private UserMapper mapper;
private DBSession session;
public UserService(){
try {
DBSessionFactory sessionFactory = new DBSessionFactoryBuilder().build(
ResourcesUtil.getResourceAsStream("/config.xml"));
session = sessionFactory.newDelegateSession();
mapper = session.getMapper(UserMapper.class);
} catch (Exception e) {
e.printStackTrace();
}
}
public User getUser(String id){
return mapper.findById(id);
}
public List<User> getUsers(User user){
return mapper.findByUser(user);
}
}Finally make some configurations: First make some configuration to init db,create resources/db.properties:
username = *****
password = *****
url = jdbc:mysql://localhost:3306/testdb?useUnicode=true&characterEncoding=utf8&useSSL=false
driverClassName = com.mysql.jdbc.Driver
maxActive =200
minIdle = 10
initialSize = 50
maxWait = 6000and resources/config.xml
<configuration>
<interface package="org.easyarch.test.dao" />
<mapper location="classpath:mapper/" />
<datasource location="classpath:db.properties" class=""/>
</configuration>write your sql in resources/mapper/usermapper.java
ctx.namespace = "org.easyarch.test.dao.UserMapper";
function findById(params){
return "select * from t_user where client_id = $id$";
}
function findByUser(params) {
var sql = "select * from user" + ctx.where;
if (params.username != undefined){
sql += " and username = $username";
}
if (params.phone != undefined){
sql += " and phone = $phone$";
}
if (params.client_id != undefined){
sql += " and client_id = $client_id";
}
return sql;
}Write a main function to test it:
public class Main{
public static void main(String[] args){
UserService service = new UserService();
System.out.println(service.getUser("123456"));
User user = new User();
user.setUserName("code4j");
user.setPhone("13600000000");
System.out.println(service.getUsers(user));
}
}more infomation in Chinese go to:
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