关系数据库Ormlite

package com.example.ormlite;

import java.util.List;
import com.j256.ormlite.dao.Dao;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener{
EditText ed1=null;
EditText ed2=null;
EditText ed3=null;
EditText ed4=null;
Button btn1=null;
Button btn2=null;
Dao<students, Integer> mUserDao;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ed1=(EditText) findViewById(R.id.edittextname);
ed2=(EditText) findViewById(R.id.edittextid);
ed3=(EditText) findViewById(R.id.edittextage);
ed4=(EditText) findViewById(R.id.edittextgender);
btn1=(Button) findViewById(R.id.buttonadd);
btn1.setOnClickListener(this);
btn2=(Button) findViewById(R.id.buttonchaxun);
btn2.setOnClickListener(this);

ORMLiteDatabaseHelper mDatabaseHelper = ORMLiteDatabaseHelper.getInstance(MainActivity.this);
mUserDao= mDatabaseHelper.getUserDao();

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonadd:
add();
break;
case R.id.buttonchaxun:
query();
break;
default:
break;
}

}
public void add(){
students user = new students();
user.students_id =Integer.parseInt(ed2.getText().toString());
user.age = Integer.parseInt(ed3.getText().toString());
user.name =ed1.getText().toString();
user.gender=ed4.getText().toString();
try {
mUserDao.createOrUpdate(user);
} catch (Exception e) {
}
}
public void query(){
List<students> users = null;

// 全局查询
try {
users = mUserDao.queryForAll();
} catch (Exception e) {
e.printStackTrace();
}

for (students user : users) {
Log.d("数据库数据",user.students_id+","+user.name+","+user.age+","+user.gender);
}

}
}

package com.example.ormlite;

import java.sql.SQLException;

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

public class ORMLiteDatabaseHelper extends OrmLiteSqliteOpenHelper {

private static ORMLiteDatabaseHelper mDatabaseHelper = null;
private Dao<students, Integer> mUserDao = null;

private final static String DataBase_NAME = "ormlite.db";
private final static int DataBase_VERSION = 1;

public ORMLiteDatabaseHelper(Context context, String databaseName,CursorFactory factory, int databaseVersion) {
super(context, DataBase_NAME, factory, DataBase_VERSION);
}

public static ORMLiteDatabaseHelper getInstance(Context context) {
if (mDatabaseHelper == null) {
mDatabaseHelper = new ORMLiteDatabaseHelper(context, DataBase_NAME,null, DataBase_VERSION);
}

return mDatabaseHelper;
}

@Override
public void onCreate(SQLiteDatabase arg0, ConnectionSource connectionSource) {

Log.d(this.getClass().getName(), "ORMLite数据库 -> onCreate");

try {
TableUtils.createTableIfNotExists(connectionSource, students.class);
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onUpgrade(SQLiteDatabase database, ConnectionSource arg1,
int arg2, int arg3) {

}

public Dao<students, Integer> getUserDao() {
if (mUserDao == null) {
try {
mUserDao = getDao(students.class);
} catch (SQLException e) {
e.printStackTrace();
}
}

return mUserDao;
}

@Override
public void close() {
super.close();
mUserDao = null;
}
}

package com.example.ormlite;

import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.table.DatabaseTable;

@DatabaseTable(tableName = "users")
public class students {

public students() {

}

@DatabaseField(id = true, columnName = "students_id")
public int students_id;

@DatabaseField(columnName = "name")
public String name;

@DatabaseField(columnName = "age")
public int age;

@DatabaseField(columnName = "gender")
public String gender;
}

<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.ormlite.MainActivity" >

<EditText
android:id="@+id/edittextname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/name"/>
<EditText
android:id="@+id/edittextid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/id"/>
<EditText
android:id="@+id/edittextage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/age"/>
<EditText
android:id="@+id/edittextgender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/gender"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<Button
android:id="@+id/buttonadd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/add"/>
<Button
android:id="@+id/buttonchaxun"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/chaxun"/>
</LinearLayout>
</LinearLayout >