1、SQLiteDataBase对象的query()接口
public Cursor query (String table, String[] columns, String selection, String[] selectionArgs,String groupBy, String having,String orderBy,String limit)
示例：
ContentValues cv = new ContentValues();
String[] args = {String.valueOf("a")};
query("user",new String[] { "username","password" },"username=?", args,null,null,null, null);
2、SQLiteDataBase对象的insert()接口：
publiclong insert (String table, String nullColumnHack, ContentValues values)
示例：
ContentValues cv = new ContentValues();
cv.put("username", "lanxiaofang");
cv.put("password", "123456");
insert("user", null,cv);
3、SQLiteDataBase对象的update()接口：
publicint update (String table, ContentValues values, String whereClause, String[] whereArgs)
示例：
ContentValues cv = new ContentValues();
cv.put("username", "lanxiao");
cv.put("password", "123456");
String[] args = {String.valueOf("lanxiaofang")};
update("user",cv, "username=?",args)
4、SQLiteDataBase对象的delete()接口：
publicint delete (String table, String whereClause, String[] whereArgs)
示例：
ContentValues cv = new ContentValues();
String[] args = {String.valueOf("lanxiaofang")};
delete("user", "username=?",args);
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