データベースを更新して、データベース内の重複フィールドをチェックする方法を知りたいです。曜日と時間が別の行で同じである場合、エラーが発生する必要があります。
DBヘルパー:
package me.wouter.schoolwork;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Schedule {
public static final String KEY_ROWID = "_id"; //Row Id
public static final String KEY_HOUR = "schedule_hour";
public static final String KEY_DAY = "schedule_day";
public static final String KEY_LOCATION = "schedule_location";
public static final String KEY_SUBJECT = "schedule_subject";
public static final String KEY_START = "schedule_start";
public static final String KEY_END = "schedule_end";
private static final String DATABASE_NAME = "PlanYourDay";
private static final String DATABASE_TABLE = "schedule";
private static final int DATABASE_VERSION = 1;
private dBHelper classHelper;
private final Context classContext;
private SQLiteDatabase classDatabase;
public Cursor c;
private static class dBHelper extends SQLiteOpenHelper {
public dBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_HOUR + " TEXT NOT NULL, " +
KEY_DAY + " TEXT NOT NULL, " +
KEY_LOCATION + " TEXT NOT NULL, " +
KEY_SUBJECT + " TEXT NOT NULL, " +
KEY_START + " TEXT NOT NULL, " +
KEY_END + " TEXT NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public Schedule(Context c){
classContext = c;
}
public Schedule open() throws SQLException{
classHelper = new dBHelper(classContext);
classDatabase = classHelper.getWritableDatabase();
return this;
}
public Schedule close(){
classHelper.close();
return this;
}
public long createEntry(String subject, String day, String hour,
String location, String start, String end) {
ContentValues cv = new ContentValues();
cv.put(KEY_SUBJECT, subject);
cv.put(KEY_DAY, day);
cv.put(KEY_HOUR, hour);
cv.put(KEY_LOCATION, location);
cv.put(KEY_START, start);
cv.put(KEY_END, end);
return classDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
String[] columns = new String[]{KEY_ROWID, KEY_SUBJECT, KEY_HOUR, KEY_DAY, KEY_LOCATION, KEY_START, KEY_END};
c = classDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
final int iSubject = c.getColumnIndex(KEY_SUBJECT);
int iHour = c.getColumnIndex(KEY_HOUR);
int iDay = c.getColumnIndex(KEY_DAY);
int iLocation = c.getColumnIndex(KEY_LOCATION);
int iStart = c.getColumnIndex(KEY_START);
int iEnd = c.getColumnIndex(KEY_END);
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result = result + c.getString(iRow) + " " + c.getString(iSubject) + " " + c.getString(iHour) + " "
+ c.getString(iDay) + " " + c.getString(iLocation) + " " + c.getString(iStart) + " "
+ c.getString(iEnd) + "\n";
}
return result;
}
}
DB インサーター:
package me.wouter.schoolwork;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class ScheduleTest extends Activity implements OnClickListener {
// object variables
Button bLoadSql, bSaveSql;
TextView viewSubject, viewDay, viewHour, viewLocation, viewStart, viewEnd;
EditText editSubject, editDay, editHour, editLocation, editStart, editEnd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sql);
allTheVariables();
bLoadSql.setOnClickListener(this);
bSaveSql.setOnClickListener(this);
}
private void allTheVariables() {
// defines variables in xml file
// buttons
bLoadSql = (Button) findViewById(R.id.bLoadSql);
bSaveSql = (Button) findViewById(R.id.bSaveSql);
// textviews
viewSubject = (TextView) findViewById(R.id.viewSubject);
viewDay = (TextView) findViewById(R.id.viewDay);
viewHour = (TextView) findViewById(R.id.viewHour);
viewLocation = (TextView) findViewById(R.id.viewLocation);
viewStart = (TextView) findViewById(R.id.viewStart);
viewEnd = (TextView) findViewById(R.id.viewEnd);
// edittext
editSubject = (EditText) findViewById(R.id.editSubject);
editDay = (EditText) findViewById(R.id.editDay);
editHour = (EditText) findViewById(R.id.editHour);
editLocation = (EditText) findViewById(R.id.editLocation);
editStart = (EditText) findViewById(R.id.editStart);
editEnd = (EditText) findViewById(R.id.editEnd);
}
@Override
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.bLoadSql:
Intent i = new Intent("me.wouter.schoolwork.SCHEDULEVIEW");
startActivity(i);
break;
case R.id.bSaveSql:
boolean didItWork = true;
try{
String subject = editSubject.getText().toString();
String day = editDay.getText().toString();
String hour = editHour.getText().toString();
String location = editLocation.getText().toString();
String start = editStart.getText().toString();
String end = editEnd.getText().toString();
Schedule entry = new Schedule(this);
entry.open();
entry.createEntry(subject, day, hour, location, start, end);
entry.close();
}catch (Exception e){
didItWork = false;
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("Failed");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}finally{
if(didItWork){
Dialog d = new Dialog(this);
d.setTitle("Inserted");
TextView tv = new TextView(this);
tv.setText("Succes");
d.setContentView(tv);
d.show();
}
}
break;
}
}
}
ビューアー/ローダー:
package me.wouter.schoolwork;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class ScheduleView extends Activity {
TextView subject;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sqlview);
subject = (TextView) findViewById(R.id.subject);
Schedule info = new Schedule(this);
info.open();
String data = info.getData();
subject.setText(data);
info.close();
}
}
前もって感謝します！