软件简介

jdao是轻量级orm工具包，生成与数据表对应的dao类，持久层dao对象操作，同时也支持原生sql语句操作，支持多数据源，对象缓存等.

jdao 初始化：
DaoFactory.setDefaultDataSource(getDataSource());
jdao初始化 设置数据源，一步完成。

getDataSource()获取数据源方法：
如：ActionTest1_1_2.java 中：
public static DataSource getDataSource() throws Exception {
Properties p = new Properties();
p.load(ActionTest1_1_2.class.getClassLoader().getResourceAsStream(“druid.properties”));
return DruidDataSourceFactory.createDataSource(p);}

例如：对 数据库表名为 hstest的操作
CREATE TABLE hstest (
id int(10) DEFAULT NULL,
value varchar(50) DEFAULT ‘’,
rowname varchar(50) DEFAULT ‘’
)

一.生成dao对象,生成Hstest.java
public void createDao() throws Exception {
Class.forName(“com.mysql.jdbc.Driver”);
String driverUrl = “jdbc:mysql://127.0.0.1:3306/test”;
String path = System.getProperty(“user.dir”) + “/test/com/jdao/action”;
CreateDaoUtil.createFile(“com.jdao.action”,
“hstest”,path,DriverManager.getConnection(driverUrl, “root”, “123456”),
“utf-8”);
//com.jdao.action 为 Hstest的包名
//hstest为表名
}

二.对Hstest对象的操作 查询 SQL: select value,rowname from hstest where id
between 2 and 10;
jdao对象操作如下：
Hstest t = new Hstest();
t.where(Hstest.ID.BETWEEN(2, 10));
t.query(Hstest.VALUE, Hstest.ROWNAME);

插入 SQL: insert into hstest (id,rowname,value)
values(1,”donnie”,”wuxiaodong”)
jdao对象操作如下：
Hstest t = new Hstest();
t.setId(1);
t.setRowname(“donnie”);
t.setValue(“wuxiaodong”);
t.save();

批量插入 SQL: insert into hstest (id,rowname,value)
values(1,”donnie1”,”wuxiaodong1”),(2,”donnie2”,”wuxiaodong2”),(3,”donnie3”,”wuxiaodong3”)
jdao对象操作如下：
Hstest t = new Hstest();
t.setId(1);
t.setRowname(“donnie1”);
t.setValue(“wuxiaodong1”);
t.addBatch();
t.setId(2);
t.setRowname(“donnie2”);
t.setValue(“wuxiaodong2”);
t.addBatch();
t.setId(3);
t.setRowname(“donnie3”);
t.setValue(“wuxiaodong3”);
t.addBatch();
t.batchForSave();

更新 SQL: update hstest set rowname=”wuxiaodong”,value=”wuxiaodong” where
id=10
jdao对象操作如下：
Hstest t = new Hstest();
t.setRowname(“wuxiaodong”);
t.setValue(“wuxiaodong”);
t.where(Hstest.ID.EQ(10));
t.update();
删除 SQL: delete from hstest where id=2
jdao对象操作如下:
Hstest t = new Hstest();
t.where(Hstest.ID.EQ(2));
t.delete();
三.支持SQL操作 DBUtils
DBUtils> db=new DBUtils();
db.select(“select * from hstest where id=? limit 1”,1);
System.out.println(db.getString(“value”));
int i = db.execute(“insert into hstest(rowname,value)values(?,?)”,1,2);
四.自定义类继承 DBUtils
任何子类继承自DBUtils 都可以设置与其对应的数据源，同时支持sql编写，支持翻页
如：class RsTest extends DBUtils {}
//翻页
public static void testSelectListPage() throws Exception {
RsTest rt = new RsTest();
// 分页查询方法
rt.selectListPage(0, 20, “select * from hstest”);
System.out.println(rt.rsList().size());
// selectListPage 会返回 totalcount
List list = rt.rsList();
for (RsTest r : list) {
System.out.println(r.getString(“value”));
}
}

//单行返回
public static void testSelect() throws Exception {
RsTest rt = new RsTest();
rt.select(“select * from hstest where id=?”, 1);
System.out.println(rt.getString(“value”));
rt.select(“select * from hstest where id=?”, 2);
System.out.println(rt.getString(“value”));
}

//插入
public static void testInsert() throws Exception {
RsTest rt = new RsTest();
System.out.println(rt.execute(“insert into
hstest(value,rowname)values(?,?),(?,?) “, “wu1”, “11”, “wu2”, “22”));
}

//生成dao 的翻页测试类
public static void testPageTurn() throws Exception {
Hstest ht = new Hstest();
ht.setPageTurn(true); //翻页
ht.where(Hstest.ID.GE(0));
List list = ht.query();
System.out.println(“totalcount:” + list.get(0).getTotalcount());
for (Hstest h : list) {
System.out.println(h.getRowname() + ” ” + h.getValue());
}
}

//PageDao类测试
public static void testPageDao() throws Exception {
Hstest ht = new Hstest();
ht.where(Hstest.ID.GE(1));
PageDao pd = ht.selectListPage();
System.out.println(“totalcount:” + pd.getTotalcount());
List list = pd.getList();
for (Hstest h : list) {
System.out.println(h.getRowname() + ” ” + h.getValue());
}
}
五.事务
Transaction t = new Transaction(getDataSource());
Hstest hstest = new Hstest();
hstest.setTransaction(t);
hstest.setRowname(“wu”);
hstest.setValue(“dong”);
hstest.save();
Hstest hstest2 = new Hstest();
hstest2.setTransaction(t);
hstest2.setRowname(“wu2”);
hstest2.setValue(“dong2”);
hstest2.save();
DBUtils rt = new DBUtils();
rt.setTransaction(t);
rt.execute(“insert into hstest(rowname,value)values(?,?)”, 1, 2);
t.rollBackAndClose();