下面给出的是我的代码。
我有两个课程：Dbhelper.java和RssActivity.java
基本上我已经创建了一个students表，我的代码正在创建表，但是没有将值插入到表中。
有两个文本框：一个用于输入名称，另一个用于输入roll no。
我希望roll no位于00113202709到12013203709范围内时应插入值
我希望这些值应来自2个文本框editText1和editText2，并插入我的数据库表中。
感谢您的帮助。
Dbhelper.java：
public class Dbhelper extends SQLiteOpenHelper {
//private static final String TAG = Dbhelper.class.getSimpleName();
public static final String db_name = "member.db";
public static final int db_version = 1;
public final String TABLE = "students";
public static final String C_ID = BaseColumns._ID;
public static final String C_Name = "SName";
public static final String C_ENo = "Enroll No";
private Context context;
public Dbhelper(Context context) {
super(context, db_name, null, db_version);
this.context=context;
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = String.format(
"create table %s (%s TEXT primary key, %s TEXT, %s TEXT )",
TABLE, C_ID, C_Name, C_ENo);
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("drop table if exists " + TABLE);
this.onCreate(db);
}
}
RssActivity.java：
public class RssActivity extends Activity implements OnClickListener {
TextView Title;
EditText Name, ENo;
Button but;
public String n1 = "001";
public String n2 = "120";
public String s1, s2, s3;
Dbhelper obj;
SQLiteDatabase db;
ContentValues val;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Title = (TextView) findViewById(R.id.textView1);
Name = (EditText) findViewById(R.id.editText2);
ENo = (EditText) findViewById(R.id.editText1);
but = (Button) findViewById(R.id.button1);
but.setOnClickListener(this);
obj=new Dbhelper(RssActivity.this);
db=obj.getWritableDatabase();
}
public void onClick(View v) {
String name = Name.getText().toString();
String enr = ENo.getText().toString();
try {
if (name.equals("")) {
Name.setError(getText(R.string.Empty));
Toast.makeText(this, R.string.Empty, Toast.LENGTH_LONG).show();
} else if ((ENo.getText().toString().length() == 0)) {
ENo.setError(getText(R.string.Empty));
Toast.makeText(this, R.string.Empty, Toast.LENGTH_LONG).show();
} else if ((ENo.getText().toString().length() < 11))
{
ENo.setError(getText(R.string.Invalid));
Toast.makeText(this, R.string.Invalid, Toast.LENGTH_LONG)
.show();
}
else
{
s1 = "000";
s2 = "00000000";
throw new Exception();
}
}
catch (Exception e) {
e.printStackTrace();
s1 = enr.substring(0, 3);
s2 = enr.substring(3, 11);
s3 = "13202709";
int r1 = s1.compareTo(n1);
int r2 = s1.compareTo(n2);
if (s2.equals(s3)) {
if (r1 == 0 || r2 == 0) {
Toast.makeText(this, R.string.Success, Toast.LENGTH_LONG)
.show();
val=new ContentValues();
val.clear();
val.put(obj.C_ID, s1);
val.put(obj.C_Name, name);
val.put(obj.C_ENo,enr);
db.insert(obj.TABLE, null, val);
db.close();
} else if (r1 < 0 || r2 > 0) {
Toast.makeText(this, R.string.Fail, Toast.LENGTH_LONG)
.show();
} else if (r1 > 0 || r2 < 0) {
Toast.makeText(this, R.string.Success, Toast.LENGTH_LONG)
.show();
}
}
else
Toast.makeText(this, R.string.Fail, Toast.LENGTH_LONG).show();
}
db.close();
obj.close();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case R.id.item1:
startActivity(new Intent(this, Welcomescreen.class));
this.finish();
break;
case R.id.item2:
this.finish();
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
Intent intent = new Intent(this, Welcomescreen.class);
// intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
this.finish();
}
}