SQLite数据库的创建、常用方法增删改查

package com.example.util;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DBcreat extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "users.db";

public DBcreat(Context context) {
super(context, DATABASE_NAME, null, 1);

}

@Override
public void onCreate(SQLiteDatabase db) {
// 创建表格
String str = new String(
"create table user (id integer primary key autoincrement , name varchar(20))");
String str2 = new String(
"create table unuser (id integer primary key autoincrement , name varchar(20))");
//执行
db.execSQL(str);
db.execSQL(str2);
String str21 = new String("insert into unuser(name) values (?)");

db.execSQL(str21, new String[] { "历史回眸" });
db.execSQL(str21, new String[] { "社员风采" });
String str1 = new String("insert into user(name) values (?)");

db.execSQL(str1, new String[] { "社内简介" });
db.execSQL(str1, new String[] { "本社介绍" });
db.execSQL(str1, new String[] { "履行职能" });
db.execSQL(str1, new String[] { "自身建设" });

}

@Override//版本更新
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub

}

}

package com.example.util;

import java.util.ArrayList;
import java.util.List;

import com.example.bean.Unuser;
import com.example.bean.User;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

public class Dbutil {
private SQLiteDatabase db;

public Dbutil(Context context) {
DBcreat dBcreat = new DBcreat(context);
db = dBcreat.getWritableDatabase();

}

// 添加
public void addAll(User user) {
String name = user.getName();
String str = new String("insert into user(name) values (?)");

db.execSQL(str, new String[] { name });
Log.e("", "添加成功");
}

// 查询
public List<User> findAll() {
List<User> list = new ArrayList<User>();
Cursor cursor = db.query("user", null, null, null, null, null, null);
if (cursor != null) {
int columnIndexid = cursor.getColumnIndex("id");
int columnIndexname = cursor.getColumnIndex("name");
while (cursor.moveToNext()) {
int id = cursor.getInt(columnIndexid);
String name = cursor.getString(columnIndexname);
User user = new User(id, name);
list.add(user);
Log.e("", "查询成功");
}
}

return list;

}

// 删除
public void deleteAll(User user) {
String name = user.getName();
String str = new String("delete from user where name=?");
db.execSQL(str, new String[] { name });
}

// 修改
public void updateAll(String name, int id) {
String str = "update user set name =? where id=?";
db.execSQL(str, new Object[] { name, id });
}
}