这是我的数据库帮助
public class DBHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 4;
private static final String DATABASE_NAME = "organizer.db";
public DBHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db){
**String CREATE_TABLE_PROJECT = "CREATE TABLE" + Project.TABLE + "("
+ Project.KEY_ID + "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ Project.KEY_title + "TEXT,"
+ Project.KEY_type + "TEXT,"
+ Project.KEY_priority + "INTEGER,"
+ Project.KEY_timeframe + "TEXT,"
+ Project.KEY_start + "TEXT,"
+ Project.KEY_end + "TEXT,"
+ Project.KEY_cost + "INTEGER,"
+ Project.KEY_status + "TEXT" +");";
db.execSQL(CREATE_TABLE_PROJECT);**
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
db.execSQL("DROP TABLE IF EXIST" + Project.TABLE);
onCreate(db);
}
}
这是我对表格和字段的声明
public class Project {
public static final String TABLE = "Project";
public static final String KEY_ID = "id";
public static final String KEY_title = "title";
public static final String KEY_type = "type";
public static final String KEY_priority = "priority";
public static final String KEY_timeframe = "timeframe";
public static final String KEY_start = "start";
public static final String KEY_end = "end";
public static final String KEY_status = "status";
public static final String KEY_cost = "cost";
public int project_ID;
public String title;
public String type;
public int priority;
public String timeframe;
public String start;
public String end;
public String status;
public int cost;
}
这是我的xml将显示的地方
public class ProjectDetail extends Activity implements View.OnClickListener{
Button btnSave, btnDelete, btnClose;
EditText eTtitle, etType, eTprio, eTtf;
EditText eTsd, eTed,eTcost,eTstat;
private int _Project_Id=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_project_detail);
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnClose);
btnClose = (Button) findViewById(R.id.btnClose);
eTtitle = (EditText) findViewById(R.id.eTtitle);
etType = (EditText) findViewById(R.id.eTtype);
eTprio = (EditText) findViewById(R.id.eTprio);
eTtf = (EditText) findViewById(R.id.eTtf);
eTsd = (EditText) findViewById(R.id.eTsd);
eTed = (EditText) findViewById(R.id.eTed);
eTcost = (EditText) findViewById(R.id.eTcost);
eTstat = (EditText) findViewById(R.id.eTstat);
_Project_Id=0;
Intent intent = getIntent();
_Project_Id = intent.getIntExtra("project_Id", 0);
ProjectCrud pcrud = new ProjectCrud(this);
Project project = new Project();
project = pcrud.getProjectById(_Project_Id);
eTtitle.setText(project.title);
etType.setText(project.type);
eTprio.setText(String.valueOf(project.priority));
eTtf.setText(project.timeframe);
eTsd.setText(project.start);
eTed.setText(project.end);
eTcost.setText(String.valueOf(project.cost));
eTstat.setText(project.status);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_project_detail, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View view) {
if (view== findViewById(R.id.btnSave)){
ProjectCrud pcrud = new ProjectCrud(this);
Project project = new Project();
project.title=eTtitle.getText().toString();
project.type=etType.getText().toString();
project.priority= Integer.parseInt(eTprio.getText().toString());
project.timeframe=eTtf.getText().toString();
project.start=eTsd.getText().toString();
project.end=eTed.getText().toString();
project.cost=Integer.parseInt(eTcost.getText().toString());
project.status=eTstat.getText().toString();
project.project_ID=_Project_Id;
if(_Project_Id==0){
_Project_Id=pcrud.insert(project);
Toast.makeText(this, "New Project Created", Toast.LENGTH_SHORT).show();
}else {
pcrud.update(project);
Toast.makeText(this, "Project Updated", Toast.LENGTH_SHORT).show();
}
}else if (view == findViewById(R.id.btnDelete)){
ProjectCrud pcrud = new ProjectCrud(this);
pcrud.delete(_Project_Id);
Toast.makeText(this, "Project Deleted", Toast.LENGTH_SHORT).show();
finish();
}else if (view == findViewById(R.id.btnClose)){
finish();
}
}
}
答案 0 :(得分：1)
由于create语句中的间距错误，这种情况发生了： 您需要将所有常量定义为
public static final String TABLE = " Project ";
注意字符串中的空格。 如果将空格放在查询中而不是常量中，那么它将更有用 -
String CREATE_TABLE_PROJECT = "CREATE TABLE " + Project.TABLE + "("
+ Project.KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ Project.KEY_title + " TEXT,"
+ Project.KEY_type + " TEXT,"
+ Project.KEY_priority + " INTEGER,"
+ Project.KEY_timeframe + " TEXT,"
+ Project.KEY_start + " TEXT,"
+ Project.KEY_end + " TEXT,"
+ Project.KEY_cost + " INTEGER,"
+ Project.KEY_status + " TEXT" +");";