我无法创建表。显示数据库已创建，也可以插入行，但表未创建。
public class DatabaseOperations extends SQLiteOpenHelper {
public static final int Database_version = 2;
public static final String Tag = DatabaseOperations.class.getSimpleName();
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + TableData.TableInfo.TABLE_NAME + " (" +
TableData.TableInfo.USER_ID + " INTEGER PRIMARY KEY," +
TableData.TableInfo.USER_PASS +" TEXT "+ "," +
TableData.TableInfo.USER_EMAIL +" TEXT "+ ");";
public DatabaseOperations(Context context) {
super(context, TableData.TableInfo.DATABASE_NAME, null,Database_version);
Log.d("Tag", "Database created");
}
@Override
public void onCreate(SQLiteDatabase sdb) {
sdb.execSQL(SQL_CREATE_ENTRIES);
Log.d("Tag", "Table created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void putInformation(DatabaseOperations drop, String name, String pass, String email) {
SQLiteDatabase SQ = drop.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TableData.TableInfo.USER_ID, name);
cv.put(TableData.TableInfo.USER_PASS, pass);
cv.put(TableData.TableInfo.USER_EMAIL, email);
long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);
Log.d("Tag", "inert a row");
}
public Cursor getInformation(DatabaseOperations dop) {
SQLiteDatabase SQ = dop.getReadableDatabase();
String[] coloumns = {TableData.TableInfo.USER_ID, TableData.TableInfo.USER_PASS, TableData.TableInfo.USER_EMAIL};
Cursor CR = SQ.query(TableData.TableInfo.TABLE_NAME, coloumns, null, null, null, null, null);
return CR;
}
}
最佳答案
您在 CREATE TABLE 中的 USER_EMAIL 和 USER_PASS 列之间缺少 ,。
添加后，您可以卸载应用程序以重新创建数据库。 When is SQLiteOpenHelper onCreate() / onUpgrade() run?
关于java - 无法在android上的sqlite数据库中创建表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41139382/