DbUtils

package com.example.day_17dbutils;

import java.util.ArrayList;

import java.util.List;

import com.lidroid.xutils.DbUtils;

import com.lidroid.xutils.db.sqlite.Selector;

import com.lidroid.xutils.db.sqlite.WhereBuilder;

import com.lidroid.xutils.exception.DbException;

import android.os.Bundle;

import android.app.Activity;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.util.Log;

import android.view.Menu;

import android.view.View;

public class MainActivity extends Activity {

private DbUtils dbUtils;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

dbUtils = DbUtils.create(this, "user.db");

}

// 插入

public void insert(View v) {

List<User> list = new ArrayList<User>();

User user = new User("宽叔", "n", "99");

list.add(user);

for (int i = 0; i < 3; i++) {

User user2 = new User("宽叔" + i, "n" + i, "99" + i);

list.add(user2);

}

/*

* user.age="18"; user.name="宽叔"; user.sex="??";

*/

try {

// 单条保存,以对象的形式

// dbUtils.save(user);

// 保存一个集合

dbUtils.saveAll(list);

} catch (DbException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

// dbUtils.saveAll(entities);

}

// 删

public void delete(View v) {

try {

// 所有以User类型保存的都删

dbUtils.deleteAll(User.class);

// dbUtils.delete(new User(15,null,null,null));//通过Id删除

// dbUtils.delete(User.class, WhereBuilder.b("age", "=", "990").

// and("", "","").or(columnName, op, value));//条件删除

/*

* List<User> list=new ArrayList<User>();//无效 User user=new

* User("宽叔","n","99"); User user2=new User(22,null,null,null);

* list.add(user); list.add(user2); dbUtils.deleteAll(list);

*/

// 指定类型,通过id删除

// dbUtils.deleteById(User.class, 14);

} catch (DbException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 改

public void update(View v) {

try {

// 通过id修改,指定影响的列,默认id是约束条件

// dbUtils.update(new User(22,"王主任","===","30"),

// "name","sex","age");

// 通过约束条件修改(参数二),参数一是修改后的数据,对主键id不起作用

// dbUtils.update(new User(0,"王院","男","992"),

// WhereBuilder.b("name", "=", "程院"), "name","sex","age");

List<User> list = new ArrayList<User>();

User user = new User(31, "宽叔1111", "n1111", "991111");

User user2 = new User(32, "宽叔2222", "n2222", "9922222");

list.add(user2);

list.add(user);

// User user2=new User(22,null,null,null);

// 修改,集合里的数据就是修改后的数据,默认主键id是约束条件

dbUtils.updateAll(list, "name", "sex", "age");

} catch (DbException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 查

public void select(View v) {

try {

// 根据类型查询

List<User> findAll = dbUtils.findAll(User.class);

// 精确匹配除id外的数据

List<User> findAll2 = dbUtils.findAll(new User(0, "宽叔", "n", "99"));

List<User> findAll3 = dbUtils.findAll(

User.class,

WhereBuilder.b("sex", "=", "n2").or("name", "=", "宽叔0")

.or("name", "like", "%1%"));

System.out.println(findAll3.size());

for (User user : findAll3) {

System.out.println(user.toString());

}

User findFirst = dbUtils.findFirst(User.class);

System.out.println(findFirst.toString()+"]]]]]]]]]]]]]]]]]]]]]]");

// dbUtils.findFirst(Selector.from(User.class).);

} catch (DbException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

=========================================================================================

/**

*

*/

package com.example.day_17dbutils;

/**

* @author WJL

*

*/

public class User {

public User() {

super();

// TODO Auto-generated constructor stub

}

public User(String name, String sex, String age) {

this.name = name;

this.sex = sex;

this.age = age;

}

public User(int id, String name, String sex, String age) {

super();

this.id = id;

this.name = name;

this.sex = sex;

this.age = age;

}

public int id;

public String name;

public String sex;

public String age;

@Override

public String toString() {

return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", age="

+ age + "]";

}

}