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我的Android Studio獲得了2.3.1版本的更新，而我正在處理我的項目。當時，一切都很完美，我爲不同的屏幕尺寸創建佈局，所以當我試圖在模擬器上看到應用程序時。當我開始使用Nexus 7 API 24時，當我想進入並獲得此錯誤時，我得到了一個暗戀。在Android模擬器中更改了API，並獲取SQLiteException
造成：android.database.sqlite.SQLiteException：沒有這樣的列：user_id（代碼1）：，而編譯時：SELECT task_Id，user_id，標題，內容從Todos WHERE user_id =？
此行
在com.ToDo.todoTasks.sql.DatabaseHelper.getTaskByUser（DatabaseHelper.java:149）
指向
Cursor cursor = db.query
哪在裏面
public ArrayList<ToDo> getTaskByUser()
public ArrayList<ToDo> getTaskByUser() {
// array of columns to fetch
String[] columns = {
TASK_ID,
user_id,
TITLE,
CONTENT
};
ArrayList<ToDo> taskList = new ArrayList<ToDo>();
SQLiteDatabase db = this.getReadableDatabase();
// query the user table
SharedPreferences pref = ctx.getSharedPreferences("LOGIN", Context.MODE_PRIVATE);
String userid = pref.getString("USER_NUM", null);
Cursor cursor = db.query(
mTODO,
columns,
"user_id = ?",
new String[]{userid},
null,
null,
null);
// Traversing through all rows and adding to list
if (cursor.moveToFirst()) {
do {
ToDo todo = new ToDo();
todo.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(TASK_ID))));
todo.setTitle(cursor.getString(cursor.getColumnIndex(TITLE)));
todo.setUserID(cursor.getString(cursor.getColumnIndex(user_id)));
todo.setContent(cursor.getString(cursor.getColumnIndex(CONTENT)));
// Adding user record to list
taskList.add(todo);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
// return user list
return taskList;
}
我DatabaseHelper類
public class DatabaseHelper extends SQLiteOpenHelper {
Context ctx;
// Database Version
private static final int DB_VER = 1;
// Database Name
private static final String DATABASE_NAME = "UserManager.db";
// User table name
private static final String TABLE_USER = "user";
// User Table Columns names
private static final String COLUMN_USER_ID = "user_id";
private static final String COLUMN_USER_NAME = "user_name";
private static final String COLUMN_USER_EMAIL = "user_email";
private static final String COLUMN_USER_PASSWORD = "user_password";
//Table mToDo task name
private final static String mTODO = "Todos";
//Todos table columns names
private final static String TASK_ID = "task_Id"; //autoincrement
private final static String user_id = "user_id";
private final static String TITLE = "title";
private final static String CONTENT = "content";
// create table sql query
private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "("
+ COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + COLUMN_USER_NAME + " TEXT,"
+ COLUMN_USER_EMAIL + " TEXT," + COLUMN_USER_PASSWORD + " TEXT" + ")";
private String CREATE_mTODO_TABLE = "CREATE TABLE " + mTODO + "("
+ TASK_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + user_id + "TEXT"
+ TITLE + " TEXT," + CONTENT + " TEXT" + ")";
// drop table sql query
private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + TABLE_USER;
/**
* Constructor
*
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DB_VER);
this.ctx = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_USER_TABLE);
db.execSQL(CREATE_mTODO_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//Drop User Table if exist
db.execSQL(DROP_USER_TABLE);
// Create tables again
onCreate(db);
}
/**
* This method is to create user record
*
* @param user
*/
public void add(User user) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_USER_NAME, user.getName());
values.put(COLUMN_USER_EMAIL, user.getEmail());
values.put(COLUMN_USER_PASSWORD, user.getPassword());
// Inserting Row
db.insert(TABLE_USER, null, values);
db.close();
}
public void add(ToDo todoTask) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(TITLE, todoTask.getTitle());
values.put(CONTENT, todoTask.getContent());
values.put(user_id, todoTask.getUserID());
// Inserting Row
db.insert(mTODO, null, values);
db.close();
}
public void update(ToDo todo){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(TITLE, todo.getTitle());
values.put(CONTENT, todo.getContent());
// Inserting Row
db.update(mTODO,values,"task_Id=" + todo.getId(),null);
db.close();
}
public ToDo getTaskById (int taskid){
SQLiteDatabase d = this.getReadableDatabase();
ToDo todo = new ToDo();
String[] columns = {
TASK_ID,
TITLE,
CONTENT,
user_id
};
Cursor cursor = d.query(
mTODO,
columns,
"task_Id = ?",//Where value
new String[]{String.valueOf(taskid)},
null,
null,
null
);
try {
if (cursor.moveToFirst()) {
todo.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(TASK_ID))));
todo.setTitle(cursor.getString(cursor.getColumnIndex(TITLE)));
todo.setUserID(cursor.getString(cursor.getColumnIndex(user_id)));
todo.setContent(cursor.getString(cursor.getColumnIndex(CONTENT)));
// Adding user record to list
}
} catch (Exception e){
e.printStackTrace();
}
return todo;
}
public boolean checkUser(String email) {
// array of columns to fetch
String[] columns = {
COLUMN_USER_ID
};
SQLiteDatabase db = this.getReadableDatabase();
// selection criteria
String selection = COLUMN_USER_EMAIL + " = ?";
// selection argument
String[] selectionArgs = {email};
// query user table with condition
Cursor cursor = db.query(
TABLE_USER, //Table to query
columns, //columns to return
selection, //columns for the WHERE clause
selectionArgs, //The values for the WHERE clause
null, //group the rows
null, //filter by row groups
null); //The sort order
int cursorCount = cursor.getCount();
cursor.close();
db.close();
if (cursorCount > 0) {
return true;
}
return false;
}
/**
* This method to check user exist or not
*/
public long checkUser(String email, String password) {
// array of columns to fetch
String[] columns = {
COLUMN_USER_ID
};
SQLiteDatabase db = this.getReadableDatabase();
// selection criteria
String selection = COLUMN_USER_EMAIL + " = ? " + " AND " + COLUMN_USER_PASSWORD + " = ?";
// selection arguments
String[] selectionArgs = {email, password};
// query user table with conditions
long userid = 0;
Cursor cursor = db.query(TABLE_USER, //Table to query
columns, //columns to return
selection, //columns for the WHERE clause
selectionArgs, //The values for the WHERE clause
null, //group the rows
null, //filter by row groups
null); //The sort order
cursor.moveToFirst();
int cursorCount = cursor.getCount();
if (cursorCount > 0) {
userid = cursor.getLong(0);
cursor.close();
db.close();
return userid;
}
return 0;
}
public void deleteRow(ToDo todo) {
SQLiteDatabase db = this.getWritableDatabase();
// delete user record by id
db.delete(mTODO, TASK_ID + " = ?", new String[]
{String.valueOf(todo.getId())});
db.close();
}
}
我真的想知道我沒有搞砸，當一切都很完美。
您是否最近將user_id添加到數據庫模型中？ –