Sqlite的基本用法

import java.sql.ResultSet;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;


public class MyOpenHelper extends SQLiteOpenHelper {


public MyOpenHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}


//数据库创建时，此方法会调用
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table person(_id integer primary key autoincrement, name char(10), salary char(20), phone integer(20))");


}


//数据库升级时，此方法会调用
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
System.out.println("数据库升级了");
}




}

创建Test测试框架

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


public class TestCase extends AndroidTestCase {


//此时测试框架还没有初始化完毕，没有虚拟上下文对象
// private MyOpenHelper oh = new MyOpenHelper(getContext(), "people.db", null, 1);
private MyOpenHelper oh;
private SQLiteDatabase db;
public void test(){
//getContext():获取一个虚拟的上下文
MyOpenHelper oh = 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 db = oh.getWritableDatabase();
//如果存储空间满了，那么返回只读数据库对象
// SQLiteDatabase db = oh.getReadableDatabase();
}

//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
@Override
protected void setUp() throws Exception {
super.setUp();

oh = new MyOpenHelper(getContext(), "people.db", null, 1);
db = oh.getWritableDatabase();
}


//测试方法执行完毕之后，此方法调用
@Override
protected void tearDown() throws Exception {
// TODO Auto-generated method stub
super.tearDown();
db.close();
}

public void insert(){

// db.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"luo[1]", "13000", 138438});
// db.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"luo", 14000, "13888"});
db.execSQL("insert into person (name, salary, phone)values(?, ?, ?)", new Object[]{"luo", 14000, "13888"});
}

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

public void update(){
db.execSQL("update person set phone = ? where name = ?", new Object[]{186666, "luo"});
}

public void select(){
Cursor cursor = db.rawQuery("select name, salary from person", null);

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);
}
}

public void insertApi(){
//把要插入的数据全部封装至ContentValues对象
ContentValues values = new ContentValues();
values.put("name", "luo1");
values.put("phone", "15999");
values.put("salary", 16000);
db.insert("person", null, values);
}

public void deleteApi(){
int i = db.delete("person", "name = ? and _id = ?", new String[]{"1111", "3"});
System.out.println(i);
}

public void updateApi(){
ContentValues values = new ContentValues();
values.put("salary", 26000);
int i = db.update("person", values, "name = ?", new String[]{"11111"});
System.out.println(i);
}

public void selectApi(){
Cursor cursor = db.query("person", null, null, null, null, null, null, null);
while(cursor.moveToNext()){
String name = cursor.getString(cursor.getColumnIndex("name"));
String phone = cursor.getString(cursor.getColumnIndex("phone"));
String salary = cursor.getString(cursor.getColumnIndex("salary"));
System.out.println(name + ";" + phone + ";" + salary);
}
}

public void transaction(){
try{
//开启事务
db.beginTransaction();
ContentValues values = new ContentValues();
values.put("salary", 12000);
db.update("person", values, "name = ?", new String[]{"111"});

values.clear();
values.put("salary", 16000);
db.update("person", values, "name = ?", new String[]{"11111"});

int i = 3/0;
//设置  事务执行成功
db.setTransactionSuccessful();
}
finally{
//关闭事务，同时提交，如果已经设置事务执行成功，那么sql语句就生效了，反之，sql语句回滚
db.endTransaction();
}
}
}