Android数据库的创建

package com.example.mi.dateBase;

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

/**
* Created by Administrator on 2018/4/1.
*/

public class MyDatebaseHelper extends SQLiteOpenHelper {

//构造方法,用于确定数据库的名称,版本号等
public MyDatebaseHelper(Context context) {
super(context, "mydb",null,1);
}

//创建数据库时调用一次,初始化表中数据
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("create table users(id integer primary key autoincrement,username text,password text)");
}

//数据库版本更新时回调
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}

package com.example.mi.dateBase;

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

/**
* Created by Administrator on 2018/4/1.
*/

public class MyDatebaseHelper extends SQLiteOpenHelper {

//构造方法,用于确定数据库的名称,版本号等
public MyDatebaseHelper(Context context) {
super(context, "mydb",null,1);
}

//创建数据库时调用一次,初始化表中数据
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("create table users(id integer primary key autoincrement,username text,password text)");
}

//数据库版本更新时回调
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}