Anroid——第三方数据库SQLite——SQLiteOpenHelper+SQLiteDatabase
Anroid——第三方数据库SQLite——SQLiteOpenHelper+SQLiteDatabase
package com.example.jreduch08.DataBaseHelpp;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.support.ConnectionSource;
import com.j256.ormlite.table.TableUtils;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
public class DatabaseHelper extends OrmLiteSqliteOpenHelper {
private static final String TABLE_NAME = "ormtest.db";
private Map daos = new HashMap();
private static DatabaseHelper instance;
private DatabaseHelper(Context context) {
super(context, TABLE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase database,
ConnectionSource connectionSource) {
try {
TableUtils.createTable(connectionSource, User.class);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase database,
ConnectionSource connectionSource, int oldVersion, int newVersion) {
try {
TableUtils.dropTable(connectionSource, User.class, true);
onCreate(database, connectionSource);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 单例获取该Helper
*
* @param context
* @return
*/
public static synchronized DatabaseHelper getHelper(Context context) {
context = context.getApplicationContext();
if (instance == null) {
synchronized (DatabaseHelper.class) {
if (instance == null) {
instance = new DatabaseHelper(context);
}
}
}
return instance;
}
public synchronized Dao getDao(Class clazz) throws SQLException {
Dao dao = null;
String className = clazz.getSimpleName();
if (daos.containsKey(className)) {
dao = daos.get(className);
}
if (dao == null) {
dao = super.getDao(clazz);
daos.put(className, dao);
}
return dao;
}
/**
* 释放资源
*/
@Override
public void close() {
super.close();
for (String key : daos.keySet()) {
Dao dao = daos.get(key);
dao = null;
}
}
} package com.example.jreduch08.DataBaseHelpp;
import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.table.DatabaseTable;
/**
* Created by 冲天之峰 on 2016/8/23.
*/
@DatabaseTable (tableName = "user")//表名
public class User {
@DatabaseField(id=true) //主键
private String userId;
@DatabaseField //(columnName = "userName")
private String name;
@DatabaseField
private int age;
public User(){}
public User(String userId, String name, int age) {
this.userId = userId;
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUserId() {
return userId;
}
public String setUserId(String userId) {
this.userId = userId;
return userId;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
package com.example.jreduch08.DataBaseHelpp;
import android.content.Context;
import com.j256.ormlite.dao.Dao;
import java.sql.SQLException;
import java.util.List;
/**
* Created by 冲天之峰 on 2016/8/23.
*/
public class UserDaoOrm {
private Context context;
private Dao userDao;
private DatabaseHelper helper;
public UserDaoOrm(Context context){
this.context=context;
helper=DatabaseHelper.getHelper(context);
try {
userDao=helper.getDao(User.class);
} catch (SQLException e) {
e.printStackTrace();
}
}
public void add(User user){
try {
userDao.createOrUpdate(user);
} catch (SQLException e) {
e.printStackTrace();
}
}
//查询全部
public List select() {
try {
return userDao.queryForAll();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
public void delete(User user){
try {
userDao.delete(user);
} catch (SQLException e) {
e.printStackTrace();
}
}
public User selectUser(String id){
try {
return userDao.queryBuilder().where()
.eq("userId",id)
.queryForFirst();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
}
package com.example.jreduch08.DataBaseHelpp;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.example.jreduch08.R;
import java.util.ArrayList;
import java.util.List;
public class UserDaoTestActivity extends AppCompatActivity {
private EditText name,age,userId;
private Button button1,button2,button4,button5,button6;
private TextView tv;
private Spinner sp;
private UserDaoOrm userDaoOrm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_dao_test);
name= (EditText) findViewById(R.id.name);
age= (EditText) findViewById(R.id.age);
userId= (EditText) findViewById(R.id.userId);
button1= (Button) findViewById(R.id.button1);
button2= (Button) findViewById(R.id.button2);
button6= (Button) findViewById(R.id.button6);
button4= (Button) findViewById(R.id.button4);
button5= (Button) findViewById(R.id.button5);
sp= (Spinner) findViewById(R.id.sp);
tv= (TextView) findViewById(R.id.tv);
userDaoOrm=new UserDaoOrm(this);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
User user=new User();
user.setUserId(userId.getText().toString());
user.setName(name.getText().toString());
user.setAge(Integer.parseInt(age.getText().toString()));
userDaoOrm.add(user);
Toast.makeText(getBaseContext(),"新增成功",Toast.LENGTH_SHORT).show();
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
List list=userDaoOrm.select();
String text="";
List myData=new ArrayList();
for (User u:list){
myData.add(u.getUserId()+":"+u.getName()+":"+u.getAge());
text=text+u.getUserId()+":"+u.getName()+":"+u.getAge()+"\n";
}
ArrayAdapter aa=new ArrayAdapter(getBaseContext(),android.R.layout
.simple_list_item_1,myData);
sp.setAdapter(aa);
tv.setText(text);
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
User user=new User();
user.setUserId(userId.getText().toString());
user.setName(name.getText().toString());
user.setAge(Integer.parseInt(age.getText().toString()));
userDaoOrm.delete(user);
Toast.makeText(getBaseContext(),"删除成功",Toast.LENGTH_SHORT).show();
}
});
button5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
User user=new User();
String id="";
id= userId.getText().toString();
tv.setText(userDaoOrm.selectUser(id).getUserId()+":"+userDaoOrm.selectUser(id).getName()+
":"+userDaoOrm.selectUser(id).getAge());
user=userDaoOrm.selectUser(id);
name.setText(user.getName().toString());
age.setText(user.getAge()+"");
Toast.makeText(getBaseContext(),"查询一个成功",Toast.LENGTH_SHORT).show();
}
});
button6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!userId.getText().toString().equals("")){
User u=new User();
u.setUserId(userId.getText().toString());
userDaoOrm.delete(u);
Toast.makeText(getBaseContext(), "删除一个成功", Toast.LENGTH_SHORT).show();
}
}
});
}
}