初学者在这里再次需要建议。尝试按照教程向/从数据库添加/编辑/删除数据。SQLiteConstraintException:错误代码19:约束失败
但是尝试添加一个新的标题时,我收到以下错误:
ERROR/Database(278): Error inserting Book_Title=testtitle Book_Author=testauthor
ERROR/Database(278): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed
我怀疑它的一个contraint上的ID,由于该数据库在前面的类文件已经创建。然而,我并不熟悉Java知道如何解决它。编辑和删除数据正常工作。
一些代码:
DatabaseManager.class:
public void addRow(String rowStringOne, String rowStringTwo)
{
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(TABLE_ROW_ONE, rowStringOne);
values.put(TABLE_ROW_TWO, rowStringTwo);
// ask the database object to insert the new data
try{db.insert(TABLE_NAME, null, values);}
catch(Exception e)
{
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
private class CustomSQLiteOpenHelper extends SQLiteOpenHelper
{
public CustomSQLiteOpenHelper(Context context)
{
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
// This string is used to create the database. It should
// be changed to suit your needs.
String newTableQueryString = "create table " +
TABLE_NAME +
" (" +
TABLE_ROW_ID + " integer primary key autoincrement not null," +
TABLE_ROW_ONE + " text," +
TABLE_ROW_TWO + " text" +
");";
// execute the query string to the database.
db.execSQL(newTableQueryString);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
// NOTHING TO DO HERE. THIS IS THE ORIGINAL DATABASE VERSION.
// OTHERWISE, YOU WOULD SPECIFIY HOW TO UPGRADE THE DATABASE.
}
}
}
AddData.class:
private void addRow()
{
try
{
// ask the database manager to add a row given the two strings
db.addRow
(
textFieldOne.getText().toString(),
textFieldTwo.getText().toString()
);
// request the table be updated
updateTable();
// remove all user input from the Activity
emptyFormFields();
}
catch (Exception e)
{
Log.e("Add Error", e.toString());
e.printStackTrace();
}
}
我试过删除:TABLE_ROW_ID +“整数主键自动增量非空,”+但它似乎没有作出改变,并存在相同的错误。我将如何使用表中已存在的ID插入记录? (我已经尝试了各种各样) – d347hkn3ll 2011-05-20 16:21:26
如果表中已经存在该记录,则更新它不会插入它。插入用于创建新条目。 – Eric 2011-05-20 16:35:07
该表中尚未存在该记录。数据库已经存在(在此应用程序启动时会创建此文件之前创建的类文件) – d347hkn3ll 2011-05-20 17:33:49