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通用dao的demo

2024-08-06 12:00:57   218人阅读

 

 
 
 
 

代码片段

1. [代码]整型映射工具     

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package org.dave.common.database.convert;
 
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 * 整型映射工具
 * @author David Day
 */
public class IntegerConverter implements ResultConverter<Integer> {
 
    @Override
    public Integer convert(ResultSet rs) throws SQLException {
        return rs.getInt(1);
    }
 
}

2. [代码]长整型映射工具     

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package org.dave.common.database.convert;
 
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 * 长整型映射工具
 * @author 戴威
 */
public class LongConverter implements ResultConverter<Long> {
 
    @Override
    public Long convert(ResultSet rs) throws SQLException {
        return rs.getLong(1);
    }
 
}

3. [代码]数据模型的demo     

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package org.dave.demo.model;
 
import org.dave.common.database.DataModel;
 
@SuppressWarnings("serial")
public class Demo extends DataModel {
     
    private Long id;
     
    private String name;
     
    private String pass;
     
    private String email;
 
    public Demo() {
        super();
    }
 
    public Demo(Long id) {
        super();
        this.id = id;
    }
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public String getPass() {
        return pass;
    }
 
    public void setPass(String pass) {
        this.pass = pass;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }
 
}

4. [代码]demo数据模型转换     

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package org.dave.demo.convert;
 
import java.sql.ResultSet;
import java.sql.SQLException;
 
import org.dave.common.database.convert.ResultConverter;
import org.dave.demo.model.Demo;
 
public class DemoConverter implements ResultConverter<Demo> {
 
    @Override
    public Demo convert(ResultSet rs) throws SQLException {
        Demo demo = new Demo(rs.getLong(1));
        demo.setName(rs.getString(2));
        demo.setPass(rs.getString(3));
        demo.setEmail(rs.getString(4));
        return demo;
    }
 
}

5. [代码]dao的demo     

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package org.dave.demo.dao;
 
import java.sql.Connection;
import java.util.List;
 
import org.dave.common.database.access.DataAccess;
import org.dave.common.database.convert.IntegerConverter;
import org.dave.common.database.convert.LongConverter;
import org.dave.demo.convert.DemoConverter;
import org.dave.demo.model.Demo;
 
public class DemoDao extends DataAccess {
     
    public DemoDao(Connection conn) {
        super(conn);
    }
     
    /**
     * 增加
     * @param name
     * @param pass
     * @param email
     * @return
     */
    public Long add(String name, String pass, String email) {
        return super.insert("INSERT INTO demo(name,pass,email) values(?,?,?)",
                new LongConverter(), name, pass, email);
    }
     
    /**
     * 修改
     * @param id
     * @param name
     * @param pass
     * @param email
     */
    public void update(Long id, String name, String pass, String email) {
        super.update("UPDATE demo SET name=?,pass=?,email=? WHERE id=?",
                name, pass, email, id);
    }
     
    /**
     * 删除
     * @param id
     */
    public void delete(Long id) {
        super.update("DELETE FROM demo WHERE id=?", id);
    }
     
    /**
     * 根据ID查询
     * @param id
     * @return
     */
    public Demo findById(Long id) {
        return super.queryForObject("SELECT id,name,pass,email FROM demo WHERE id=?",
                new DemoConverter(), id);
    }
     
    /**
     * 查询所有
     * @return
     */
    public List<Demo> findAll() {
        return super.queryForList("SELECT id,name,pass,email FROM demo", new DemoConverter());
    }
     
    /**
     * 查询总记录数
     * @return
     */
    public Integer getCount() {
        return super.queryForObject("SELECT COUNT(*) FROM demo", new IntegerConverter());
    }
     
    /**
     * 分页查询
     * @param start
     * @param size
     * @return
     */
    public List<Demo> findByRange(int start, int size) {
        return super.queryForList("SELECT id,name,pass,email FROM demo limit ?,?",
                new DemoConverter(), start, size);
    }
 
}

6. [代码]基础service     

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package org.dave.common;
 
import java.sql.Connection;
 
import org.dave.common.database.DatabaseTransaction;
 
public abstract class BaseService {
     
    private DatabaseTransaction trans;
     
    protected BaseService(DatabaseTransaction trans) {
        this.trans = trans;
    }
     
    protected BaseService() { }
 
    protected DatabaseTransaction getTransaction() {
        return trans;
    }
     
    protected Connection getConnection() {
        return trans.getConnection();
    }
 
}

7. [代码]service的demo     

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package org.dave.demo.service;
 
import java.util.List;
 
import org.dave.common.BaseService;
import org.dave.common.data.Pager;
import org.dave.common.database.DatabaseTransaction;
import org.dave.demo.dao.DemoDao;
import org.dave.demo.model.Demo;
 
public class DemoService extends BaseService {
 
    public DemoService(DatabaseTransaction trans) {
        super(trans);
    }
 
    public DemoService() {
        super();
    }
     
    /**
     * 增加
     * @param demo
     * @return
     */
    public Demo add(Demo demo) {
        DemoDao dao = new DemoDao(getConnection());
        Long id = dao.add(demo.getName(), demo.getPass(), demo.getEmail());
        return dao.findById(id);
    }
     
    /**
     * 更新
     * @param demo
     */
    public void update(Demo demo) {
        new DemoDao(getConnection()).update(demo.getId(), demo.getName(), demo.getPass(), demo.getEmail());
    }
     
    /**
     * 删除
     * @param id
     */
    public void delete(Long id) {
        new DemoDao(getConnection()).delete(id);
    }
     
    /**
     * 通过id查询
     * @param id
     * @return
     */
    public Demo findById(Long id) {
        return new DemoDao(getConnection()).findById(id);
    }
     
    /**
     * 查询所有
     * @return
     */
    public List<Demo> findAll() {
        return new DemoDao(getConnection()).findAll();
    }
     
    /**
     * 分页查询
     * @param page
     * @return
     */
    public List<Demo> findByPage(Pager page) {
        DemoDao dao = new DemoDao(getConnection());
        page.setTotalResults(dao.getCount());
        return dao.findByRange(page.getStartResults(), page.getPageSize());
    }
     
}

8. [代码]action的demo     

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package org.dave.demo.action;
 
import java.util.List;
 
import org.dave.common.data.Pager;
import org.dave.common.database.DatabaseTransaction;
import org.dave.demo.model.Demo;
import org.dave.demo.service.DemoService;
 
public class DemoAction {
     
    public String add() {
        DatabaseTransaction trans = new DatabaseTransaction(true);
        try {
            new DemoService(trans).add(demo);
            trans.commit();
        } catch (Exception e) {
            trans.rollback();
            return "error";
        } finally {
            trans.close();
        }
        return "toList";
    }
     
    public String update() {
        DatabaseTransaction trans = new DatabaseTransaction(true);
        try {
            new DemoService(trans).update(demo);
            trans.commit();
        } catch (Exception e) {
            trans.rollback();
            return "error";
        } finally {
            trans.close();
        }
        return "toList";
    }
     
    public String info() {
        DatabaseTransaction trans = new DatabaseTransaction(true);
        try {
            demo = new DemoService(trans).findById(demo.getId());
        } catch (Exception e) {
            return "error";
        } finally {
            trans.close();
        }
        return "info";
    }
     
    public String findByPage() {
        DatabaseTransaction trans = new DatabaseTransaction(true);
        try {
            demoList = new DemoService(trans).findByPage(page);
        } catch (Exception e) {
            return "error";
        } finally {
            trans.close();
        }
        return "page";
    }
     
    public String findAll() {
        DatabaseTransaction trans = new DatabaseTransaction(true);
        try {
            demoList = new DemoService(trans).findAll();
        } catch (Exception e) {
            return "error";
        } finally {
            trans.close();
        }
        return "list";
    }
     
    private Pager page;
     
    private Demo demo;
     
    private List<Demo> demoList;
 
    public Pager getPage() {
        return page;
    }
 
    public void setPage(Pager page) {
        this.page = page;
    }
 
    public Demo getDemo() {
        return demo;
    }
 
    public void setDemo(Demo demo) {
        this.demo = demo;
    }
 
    public List<Demo> getDemoList() {
        return demoList;
    }
 
}

9. [文件] 源码和试例包 ~ 13KB     下载(556)     

http://www.oschina.net/code/snippet_86510_4466

通用dao的demo


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