package com.example.sqlite;
import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SimpleAdapter;
public class MainActivity extends ListActivity {
private SQLiteDatabase mDb;
Cursor mCursor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDb = openOrCreateDatabase("mydb1.db",MODE_PRIVATE,null);
mDb.execSQL("drop table if exists my_table");
mDb.execSQL("create table my_table(_id integer primary key autoincrement, "+"studentId int not null, score int not null)");
mDb.execSQL("insert into my_table(studentId,score) values (60092418, 100);");
mDb.execSQL("insert into my_table(studentId,score) values (60092419, 90);");
mDb.execSQL("insert into my_table(studentId,score) values (60092420, 80);");
mCursor = mDb.query(
"my_table",
new String[] {"studentId", "score"},
null,
null,
null,
null,
"_id",
"5");
ArrayList<HashMap<String,String>> mList = new ArrayList<HashMap<String,String>>();
if(mCursor != null){
if(mCursor.moveToFirst()){
do{
HashMap<String,String> item = new HashMap<String,String>();
for (int j=0; j<mCursor.getColumnCount(); j++){
item.put(mCursor.getColumnName(j), mCursor.getString(j));
}
mList.add(item);
}while(mCursor.moveToNext());
}
}
SimpleAdapter adapter = new SimpleAdapter(this,mList,android.R.layout.simple_list_item_2,
new String[] {"studentId","score"}, new int[]{android.R.id.text1, android.R.id.text2});
setListAdapter(adapter);
setContentView(R.layout.activity_main);
Button insert = (Button)findViewById(R.id.insert);
Button delete = (Button)findViewById(R.id.delete);
insert.setOnClickListener(new OnClickListener(){
public void onClick(View v){
if(v.getId()==R.id.insert){
mDb.execSQL("insert into my_table(studentId,score) values (0, 0);");
}
}
});
delete.setOnClickListener(new OnClickListener(){
public void onClick(View v){
if(v.getId()==R.id.delete){
mDb.execSQL("delete from my_table where _id=1;");
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
엊그제 SQLite에 대해서 간단하게 배웠습니다.
배운걸 이용해서 간단하게 첫번째 데이터를 지우는 기능과
데이터를 입력하는 기능을 가진 버튼 두개를 넣어 보았는데, 제대로 작동하지를 않네요..
처음 앱 실행했을때 기본 테이블이 제대로 뜨기는하는데... 왜이런건가요?
