HaishenDB第一个例子

 PersonTest.Table t = new PersonTest.Table();
 ISelectCause sel1 = dao.newCause();
 sel1.select(t.ALL_).from(t).where().eq(t.id,"a").or().gt(t.age, 5).orderby().asc(t.age);

 

以上java语句将产生以下的sql语句。

SELECT t1.* FROM t_person AS t1 WHERE t1.Id = ? OR t1.Age > ? ORDER BY t1.Age ASC

 

完整的service代码如下。

public class ITestImpl implements ITest
{
    private IDAO dao;
    public void setDao(IDAO dao)
    {
        this.dao = dao;
    }
    @Override 
    public List<Map> findLs()
    {
        PersonTest.Table t = new PersonTest.Table();
        ISelectCause sel1 = dao.newCause();
        sel1.select(t.ALL_).from(t).where().eq(t.id,"a").or().gt(t.age, 5).orderby().asc(t.age);
        
        return dao.findList(sel1);
    }
    @Override 
    public List<PersonTest> findLsPersonTest(String pId,int pAge)
    {
        ICriteria criteria = dao.newCriteria();
        criteria.eq(t.id,pId).or().gt(t.age, pAge).orderby().asc(t.age);
        
        return dao.findList(PersonTest.class,criteria);
    }
}

PersonTest的代码。有点复杂，具体规则后续会讲。总之，这不是一个简单的java bean。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.haishen.test.bean;

import com.haishen.db.api.IPreparedStatementCallBack;
import com.haishen.db.bean.AbstractBean;
import com.haishen.db.bean.TableMetadata;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 *
 * @author hicen
 */
public class PersonTest extends AbstractBean {
    private final static PersonTest.Table  tableTmp = new PersonTest.Table();
    public static class Table extends PersonTestTable { }

    public PersonTest() {
        super(tableTmp);
    }

    public void setId(final String id) {
        this.id = id;
        IPreparedStatementCallBack pscb = new IPreparedStatementCallBack() {

            @Override
            public void setValue(PreparedStatement psmt, int pintIndex) throws SQLException {
                psmt.setString(pintIndex, id);
            }
        };
        this.put(tableTmp.id.getName(), pscb);
    }

    public void setName(final String name) {
        this.name = name;
        IPreparedStatementCallBack pscb = new IPreparedStatementCallBack() {

            @Override
            public void setValue(PreparedStatement psmt, int pintIndex) throws SQLException {
                psmt.setString(pintIndex, name);
            }
        };
        this.put(tableTmp.name.getName(), pscb);
    }

    public void setAge(final int age) {
        this.age = age;
        IPreparedStatementCallBack pscb = new IPreparedStatementCallBack() {

            @Override
            public void setValue(PreparedStatement psmt, int pintIndex) throws SQLException {
                psmt.setInt(pintIndex, age);
            }
        };
        this.put(tableTmp.age.getName(), pscb);
    }

    @Override
    public void iniFromDB(ResultSet rs) throws SQLException {
        this.id = rs.getString(tableTmp.id.getName());
        this.name = rs.getString(tableTmp.name.getName());
        this.age = rs.getInt(tableTmp.age.getName());
    }

    @Override
    public String getIdName() {
        return tableTmp.id.getFullName();
    }

    @Override
    public String getIdValue() {
        return this.id;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        
        return age; 
    }
    private String id;
    private String name;
    private int age;
}
class PersonTestTable extends TableMetadata {

    public PersonTestTable() {
        super("t_person"); 
    }
    public  StringCol id  = new StringCol("Id");
    public  StringCol name = new StringCol("Name");
    public  IntegerCol age = new IntegerCol("Age");
    
}