android对SQLite数据库进行操作（一）SQL语句

1.先创建一个MyOpenHelper类继承SQLiteOpenHelper用于对数据库的进行管理（创建时候的，更新时候的调用）

MyOpenHelper.java

package activty.zhanghang.com.myapplication;

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

/**
 * Created by dell-pc on 2016/2/9.
 */
public class MyOpenHelper extends SQLiteOpenHelper {
    public MyOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {  //数据库创建的时候自动调用
        String sql = "create table person(regedit integer,phone varchar(20),name varchar(20))";
        db.execSQL(sql);
        System.out.print("数据库创建");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {//数据库升级的时候自动调用
        System.out.print("数据库更新");
    }
}

MainActivity.java不变   【我们先不要操作你哟】

package activty.zhanghang.com.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

2.新建一个测试类  继承AndroidCaseTest

package activty.zhanghang.com.myapplication;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.test.AndroidTestCase;

/**
 * Created by dell-pc on 2016/2/9.
 */
public class TestCase extends AndroidTestCase {
    private MyOpenHelper openHelper;
    private SQLiteDatabase sqLiteDatabase;
    @Override
    public void setUp() throws Exception {//测试框架初始化完毕之后，在测试方法执行之前，此方法调用
        super.setUp();
        //getContext():获取一个虚拟的上下文
        openHelper = new MyOpenHelper(getContext(), "people.db", null, 1);
        //如果数据库不存在，先创建数据库，再获取可读可写的数据库对象，如果数据库存在，就直接打开
        sqLiteDatabase = openHelper.getWritableDatabase();

    }
    //测试框架完成后，进行方法的调用
    @Override
    public void tearDown() throws Exception {
        super.tearDown();
        sqLiteDatabase.close();
    }
    /**
 * 基本的对数据库进行增、删、改、查（SQL语句）
 */

 public void insert(){

        sqLiteDatabase.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"兄弟", "15200", 55454});
        sqLiteDatabase.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"儿子", 14000, "74424"});
        sqLiteDatabase.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"女孩", 14000, "74104"});
    }

    public void delete(){
        sqLiteDatabase.execSQL("delete from person where name = ?", new Object[]{"孩子"});
    }

    public void update(){
        sqLiteDatabase.execSQL("update person set phOne= ? where name = ?", new Object[]{186666, "女孩"});
    }

    public void select(){
        Cursor cursor = sqLiteDatabase.rawQuery("select name, salary from person", null);//获取一个游标指针
        while(cursor.moveToNext()){
            //通过列索引获取列的值
            String name = cursor.getString(cursor.getColumnIndex("name"));
            String salary = cursor.getString(1);
            System.out.println(name + ";" + salary);
        }
    }
}

注意：

使用小型测试框架的时候要在AndroidMainfest.xml中进行声明

    android:name="android.test.InstrumentationTestRunner"
    android:targetPackage="activty.zhanghang.com.myapplication"
    />

android:name="android.test.runner"/>