SQLiteOpenHelper

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添加数据

ContentValues cv = new ContentValues();  
cv.put("name",user.getName());  
cv.put("password", user.getPassword());  

SQLiteDatabase db = getWritableDatabase();
db.insert("user", null,cv);  

查询数据

查询全部

String sql = "select * from user;"
SQLiteDatabase db = dbHelper.getReadableDatabase();  
Cursor cursor = db.rawQuery(sql, null);  
while(cursor.moveToNext()){  
    User user = new User();  
    user.setName(cursor.getString(cursor.getColumnIndex("name")));  
    user.setPassword(cursor.getString(cursor.getColumnIndex("password")));  
    list.add(user);  
}  

条件查询

String sql = "select * from user where _ID=?";
String[] selectionArgs = {String.valueOf(id)};   
SQLiteDatabase db = dbHelper.getReadableDatabase();  
Cursor cursor = db.rawQuery(sql,selectionArgs);  
User user = new User();  
while(cursor.moveToNext()){  
    user.setName(cursor.getString(cursor.getColumnIndex("name")));  
    user.setPassword(cursor.getString(cursor.getColumnIndex("password")));  
} 

更新数据

删除数据

String[] whereArgs = {String.valueOf(id)};  
SQLiteDatabase db = dbHelper.getWritableDatabase();  
db.delete("user", "_ID=?", whereArgs);