?

創(chuàng)建數(shù)據(jù)庫：

class CreateListener implements OnClickListener{
@Override
public void onClick(View v) {
//創(chuàng)建一個(gè)DatabaseHelper對(duì)象
DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db");
//只有調(diào)用了DatabaseHelper對(duì)象的getReadableDatabase()方法，或者是getWritableDatabase()方法之后，才會(huì)創(chuàng)建，或打開一個(gè)數(shù)據(jù)庫
SQLiteDatabase db = dbHelper.getReadableDatabase();
}
}

更新數(shù)據(jù)庫

class UpdateListener implements OnClickListener{

@Override
public void onClick(View v) {
DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db",2);
SQLiteDatabase db = dbHelper.getReadableDatabase();
}

}

數(shù)據(jù)庫插入操作
class InsertListener implements OnClickListener{

@Override
public void onClick(View v) {
//生成ContentValues對(duì)象
ContentValues values = new ContentValues();
//想該對(duì)象當(dāng)中插入鍵值對(duì)，其中鍵是列名，值是希望插入到這一列的值，值必須和數(shù)據(jù)庫當(dāng)中的數(shù)據(jù)類型一致
values.put("id", 1);
values.put("name","zhangsan");
DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db",2);
SQLiteDatabase db = dbHelper.getWritableDatabase();
//調(diào)用insert方法，就可以將數(shù)據(jù)插入到數(shù)據(jù)庫當(dāng)中
db.insert("user", null, values);
}
}

數(shù)據(jù)庫更新操作

//更新操作就相當(dāng)于執(zhí)行SQL語句當(dāng)中的update語句
//UPDATE table_name SET XXCOL=XXX WHERE XXCOL=XX...
class UpdateRecordListener implements OnClickListener{

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//得到一個(gè)可寫的SQLiteDatabase對(duì)象
DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db");
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", "zhangsanfeng");
//第一個(gè)參數(shù)是要更新的表名
//第二個(gè)參數(shù)是一個(gè)ContentValeus對(duì)象
//第三個(gè)參數(shù)是where子句
db.update("user", values, "id=?", new String[]{"1"});
}
}

數(shù)據(jù)庫查詢操作

class QueryListener implements OnClickListener{

@Override
public void onClick(View v) {
System.out.println("aaa------------------");
Log.d("myDebug", "myFirstDebugMsg");

DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db");
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.query("user", new String[]{"id","name"}, "id=?", new String[]{"1"}, null, null, null);
while(cursor.moveToNext()){
String name = cursor.getString(cursor.getColumnIndex("name"));
System.out.println("query--->" + name);
}
}
}

、

?

數(shù)據(jù)庫類

package mars.sqlite3.db;

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

//DatabaseHelper作為一個(gè)訪問SQLite的助手類，提供兩個(gè)方面的功能，
//第一，getReadableDatabase(),getWritableDatabase()可以獲得SQLiteDatabse對(duì)象，通過該對(duì)象可以對(duì)數(shù)據(jù)庫進(jìn)行操作
//第二，提供了onCreate()和onUpgrade()兩個(gè)回調(diào)函數(shù)，允許我們?cè)趧?chuàng)建和升級(jí)數(shù)據(jù)庫時(shí)，進(jìn)行自己的操作

public class DatabaseHelper extends SQLiteOpenHelper {

private static final int VERSION = 1;
//在SQLiteOepnHelper的子類當(dāng)中，必須有該構(gòu)造函數(shù)
public DatabaseHelper(Context context, String name, CursorFactory factory,
int version) {
//必須通過super調(diào)用父類當(dāng)中的構(gòu)造函數(shù)
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}
public DatabaseHelper(Context context,String name){
this(context,name,VERSION);
}
public DatabaseHelper(Context context,String name,int version){
this(context, name,null,version);
}

//該函數(shù)是在第一次創(chuàng)建數(shù)據(jù)庫的時(shí)候執(zhí)行,實(shí)際上是在第一次得到SQLiteDatabse對(duì)象的時(shí)候，才會(huì)調(diào)用這個(gè)方法
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
System.out.println("create a Database");
//execSQL函數(shù)用于執(zhí)行SQL語句
db.execSQL("create table user(id int,name varchar(20))");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
System.out.println("update a Database");
}

刪除操作:

public void delete(){

DatabaseHelper databasehelper = new DatabaseHelper(Set_Music.this,"list_playr_db");
SQLiteDatabase db = databasehelper.getWritableDatabase();

db.delete("user", "name=?", new String[]{str});

}

}

轉(zhuǎn)載于:https://www.cnblogs.com/nuistlr/archive/2012/08/31/2665566.html

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