我正在使用 sqlite 数据库开发应用程序，该数据库具有一个存储id、name、number和block的表名注释。
现在我每次运行应用程序时都会出错
sqlite 返回：错误代码 = 1，msg = 没有这样的列：ph_number
代码如下..
public class MySQLiteHelper extends SQLiteOpenHelper {
public static final String TABLE_COMMENTS = "comments";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_COMMENT = "comment";
public static final String COLUMN_NUMBER = "ph_number";
public static final String COLUMN_BLOCK = "block";
private static final String DATABASE_NAME = "commments.db";
private static final int DATABASE_VERSION = 1;
// Database creation sql statement
private static final String DATABASE_CREATE = "create table "
+ TABLE_COMMENTS + "(" + COLUMN_ID
+ " integer primary key autoincrement, " + COLUMN_COMMENT
+ " TEXT," + COLUMN_NUMBER + " TEXT,"
+ COLUMN_BLOCK +" TEXT," +"UNIQUE(COLUMN_NUMBER) ON CONFLICT REPLACE"+ ");";
public MySQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(MySQLiteHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + TABLE_COMMENTS);
onCreate(db);
}
}
这是二等代码..
public class CommentsDataSource {
// Database fields
private SQLiteDatabase database;
private MySQLiteHelper dbHelper;
private String[] allColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_COMMENT,
MySQLiteHelper.COLUMN_NUMBER,
MySQLiteHelper.COLUMN_BLOCK};
private String[] ColNum = {MySQLiteHelper.COLUMN_NUMBER, MySQLiteHelper.COLUMN_BLOCK };
private String[] num = {MySQLiteHelper.COLUMN_NUMBER };
public CommentsDataSource(Context context) {
dbHelper = new MySQLiteHelper(context);
}
public CommentsDataSource() {
//dbHelper = new MySQLiteHelper(context);
}
public void open() throws SQLException {
database = dbHelper.getWritableDatabase();
}
public void close() {
dbHelper.close();
}
public Comment createComment(String comment, String number, String b_value) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_COMMENT, comment);
values.put(MySQLiteHelper.COLUMN_NUMBER, number);
values.put(MySQLiteHelper.COLUMN_BLOCK, b_value);
long insertId = database.insert(MySQLiteHelper.TABLE_COMMENTS, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
allColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
Comment newComment = cursorToComment(cursor);
cursor.close();
return newComment;
}
public void deleteComment(Comment comment) {
long id = comment.getId();
System.out.println("Comment deleted with id: " + id);
database.delete(MySQLiteHelper.TABLE_COMMENTS, MySQLiteHelper.COLUMN_ID
+ " = " + id, null);
}
public List<Comment> getAllComments() {
List<Comment> comments = new ArrayList<Comment>();
try{
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
allColumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Comment comment = cursorToComment(cursor);
comments.add(comment);
cursor.moveToNext();
}
// Make sure to close the cursor
cursor.close();
}catch (Exception e) {
// TODO: handle exception
}
return comments;
}
// Updating single contact
public Comment updateContact(Comment comment, String name ,String number, String b_value) {
database = dbHelper.getWritableDatabase();
long id = comment.getId();
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_COMMENT, name);
values.put(MySQLiteHelper.COLUMN_NUMBER, number);
values.put(MySQLiteHelper.COLUMN_BLOCK, b_value);
System.out.println("updated: "+ id);
// updating row
long updateId = database.update(MySQLiteHelper.TABLE_COMMENTS, values,
MySQLiteHelper.COLUMN_ID + " = " + id, null);
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
allColumns, MySQLiteHelper.COLUMN_ID + " = " + id, null,
null, null, null);
cursor.moveToFirst();
Comment newComment = cursorToComment(cursor);
cursor.close();
System.out.println("updated: "+ newComment);
return newComment;
}
private Comment cursorToComment(Cursor cursor) {
Comment comment = new Comment();
comment.setId(cursor.getLong(0));
comment.setName(cursor.getString(1));
comment.setNumber(cursor.getString(2));
comment.setB_value(cursor.getString(3));
return comment;
}
public String getValue(String phNum) {
String value = null;
String b_value =null ;
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
ColNum, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
value = cursor.getString(0);
if(PhoneNumberUtils.compare(phNum, value))
{
b_value = cursor.getString(1);
}
cursor.moveToNext();
}
// Make sure to close the cursor
cursor.close();
return b_value;
}
public boolean findNum(String phNum) {
String value = null;
boolean find =false ;
Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
num, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
value = cursor.getString(0);
if(PhoneNumberUtils.compare(phNum, value))
{
find = true;
}
cursor.moveToNext();
}
// Make sure to close the cursor
cursor.close();
return find;
}
}
我已将 ph_number 列声明为。
public static final String COLUMN_NUMBER = "ph_number";
但我仍然收到错误消息sqlite returned: error code = 1, msg = no such column: ph_number
我在这方面浪费了很多时间，但无法纠正。请帮我 ..