Android onUpgrade()方法无法正常工作
我试图调用onUpgrade()来更新我的表,只包含很少的列。但是,当我运行应用程序时,insert语句中出现错误,表示此表中不存在列(我尝试在onUpgrade()中添加的列)。我非常感谢您的帮助。 下面是我的SQLite助手类: //更新和工作Android onUpgrade()方法无法正常工作,android,database,sqlite,sql-update,Android,Database,Sqlite,Sql Update,我试图调用onUpgrade()来更新我的表,只包含很少的列。但是,当我运行应用程序时,insert语句中出现错误,表示此表中不存在列(我尝试在onUpgrade()中添加的列)。我非常感谢您的帮助。 下面是我的SQLite助手类: //更新和工作 public class TasksSQLiteOpenHelper extends SQLiteOpenHelper { public static final int VERSION = 3; public static final String
public class TasksSQLiteOpenHelper extends SQLiteOpenHelper {
public static final int VERSION = 3;
public static final String DB_NAME = "tasks_db.sqlite";
public static final String TASKS_TABLE = "tasks";
public static final String TASK_ID = "id";
public static final String TASK_NAME = "name";
public static final String TASK_RESPONSIBLE = "responsible";
public static final String TASK_PRIORITY = "priority";
public static final String TASK_DATETIME = "taskdatetime";
public TasksSQLiteOpenHelper(Context context) {
super(context, DB_NAME, null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
createTables(db);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.v("test",Integer.toString(oldVersion));
Log.v("test", Integer.toString(newVersion));
switch(oldVersion){
case 1: db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_RESPONSIBLE +" TEXT");
db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_PRIORITY +" TEXT");
Log.v("test","res + pri created");
break;
case 2: db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_DATETIME +" TEXT");
Log.v("test","date created");
break;
}
}
protected void createTables(SQLiteDatabase db) {
db.execSQL(
"create table " + TASKS_TABLE+" (" +
TASK_ID + " integer primary key,"+
TASK_NAME + " text"+
");"
);
}
}
这是我的应用程序类//已更新且有效的解决方案
public class TaskManagerApplication extends Application {
private ArrayList<Task> currentTasks;
public SQLiteDatabase database;
@Override
public void onCreate() {
super.onCreate();
TasksSQLiteOpenHelper helper = new TasksSQLiteOpenHelper(this);
database = helper.getWritableDatabase();
if (null == currentTasks) {
loadTasks();
}
}
private void loadTasks() {
currentTasks = new ArrayList<Task>();
Cursor tasksCursor = database.query(TASKS_TABLE, new String[] {TASK_ID, TASK_NAME,TASK_RESPONSIBLE,TASK_PRIORITY,TASK_DATETIME}, null, null, null, null, null);
tasksCursor.moveToFirst();
Task t;
if (! tasksCursor.isAfterLast()) {
do {
long id = tasksCursor.getLong(0);
String name = tasksCursor.getString(1);
String responsible = tasksCursor.getString(2);
String priority = tasksCursor.getString(3);
String datetime = tasksCursor.getString(4);
t = new Task(name, priority, responsible, datetime);
t.setId(id);
currentTasks.add(t);
} while (tasksCursor.moveToNext());
}
tasksCursor.close();
}
public void setCurrentTask(ArrayList<Task> currentTask) {
this.currentTasks = currentTask; // set tasks in array
}
public ArrayList<Task> getCurrentTasks() {
return currentTasks; //call back tasks
}
public void addTask(Task t) { // add new t of type Task
assert(null != t); //check for null entries - avoid crashing
ContentValues values = new ContentValues();
values.put(TASK_NAME, t.getName());
values.put(TASK_PRIORITY, t.getPriority());
values.put(TASK_RESPONSIBLE, t.getResponsible());
values.put(TASK_DATETIME, t.getDatetime());
//Log.v("test", TASK_DATETIME);
t.setId(database.insert(TASKS_TABLE, null, values));
currentTasks.add(t);
}
public void remove(long id){
//remove statement from table using where statement id
database.delete(TASKS_TABLE, TASK_ID +" ="+ id, null);
}
公共类TaskManager应用程序扩展应用程序{
私有arraylistcurrenttasks;
公共数据库;
@凌驾
public void onCreate(){
super.onCreate();
TaskSqliteOpenHelper=新TaskSqliteOpenHelper(此);
database=helper.getWritableDatabase();
如果(null==currentTasks){
loadTasks();
}
}
私有void loadTasks(){
currentTasks=new ArrayList();
Cursor tasksCursor=database.query(TASKS\u TABLE,新字符串[]{TASK\u ID,TASK\u NAME,TASK\u RESPONSIBLE,TASK\u PRIORITY,TASK\u DATETIME},null,null,null,null);
tasksursor.moveToFirst();
任务t;
如果(!tasksursor.isAfterLast()){
做{
long id=tasksCursor.getLong(0);
字符串名称=tasksursor.getString(1);
字符串responsible=tasksursor.getString(2);
字符串优先级=tasksursor.getString(3);
String datetime=tasksCursor.getString(4);
t=新任务(名称、优先级、责任、日期时间);
t、 setId(id);
currentstasks.add(t);
}while(tasksursor.moveToNext());
}
taskscrsor.close();
}
公共无效setCurrentTask(ArrayList currentTask){
this.currentTasks=currentTask;//在数组中设置任务
}
公共阵列列表getCurrentTasks(){
return currentTasks;//回调任务
}
public void addTask(Task t){//添加Task类型的新t
assert(null!=t);//检查null条目-避免崩溃
ContentValues=新的ContentValues();
value.put(TASK_NAME,t.getName());
value.put(TASK_PRIORITY,t.getPriority());
value.put(TASK_RESPONSIBLE,t.getResponsible());
value.put(TASK_DATETIME,t.getDatetime());
//Log.v(“测试”,任务\日期时间);
t、 setId(database.insert(TASKS_TABLE,null,value));
currentstasks.add(t);
}
公共无效删除(长id){
//使用where语句id从表中删除语句
数据库.delete(任务表,任务ID+“=”+ID,空);
}
}
这是我的logcat输出
08-28 16:30:41.170: I/Database(8931): sqlite returned: error code = 1, msg = table tasks has no column named datetime
08-28 16:30:41.190: E/Database(8931): Error inserting datetime=Aug 28, 2012 4:30:41 PM responsible=Me priority=Medium name=go chi
08-28 16:30:41.190: E/Database(8931): android.database.sqlite.SQLiteException: table tasks has no column named datetime: , while compiling: INSERT INTO tasks(datetime, responsible, priority, name) VALUES(?, ?, ?, ?);
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:41)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1290)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1710)
08-28 16:30:41.190: E/Database(8931): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1567)
08-28 16:30:41.190: E/Database(8931): at com.id11078995.ghnaim.exercise1.TaskManagerApplication.addTask(TaskManagerApplication.java:64)
08-28 16:30:41.190: E/Database(8931): at com.id11078995.ghnaim.exercise1.AddTaskActivity.addTask(AddTaskActivity.java:59)
08-28 16:30:41.190: E/Database(8931): at com.id11078995.ghnaim.exercise1.AddTaskActivity.onOptionsItemSelected(AddTaskActivity.java:134)
08-28 16:30:41.190: E/Database(8931): at and roid.app.Activity.onMenuItemSelected(Activity.java:2211)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:775)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:860)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
08-28 16:30:41.190: E/Database(8931): at android.view.View$PerformClick.run(View.java:9152)
08-28 16:30:41.190: E/Database(8931): at android.os.Handler.handleCallback(Handler.java:587)
08-28 16:30:41.190: E/Database(8931): at android.os.Handler.dispatchMessage(Handler.java:92)
08-28 16:30:41.190: E/Database(8931): at android.os.Looper.loop(Looper.java:130)
08-28 16:30:41.190: E/Database(8931): at android.app.ActivityThread.main(ActivityThread.java:3691)
08-28 16:30:41.190: E/Database(8931): at java.lang.reflect.Method.invokeNative(Native Method)
08-28 16:30:41.190: E/Database(8931): at java.lang.reflect.Method.invoke(Method.java:507)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
08-28 16:30:41.190: E/Database(8931): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
08-28 16:30:41.190: E/Database(8931): at dalvik.system.NativeStart.main(Native Method)
08-28 16:30:41.170:I/数据库(8931):sqlite返回:错误代码=1,msg=table任务没有名为datetime的列
08-28 16:30:41.190:E/数据库(8931):插入日期时出错=2012年8月28日下午4:30:41负责=Me优先级=中名=go chi
08-28 16:30:41.190:E/Database(8931):android.Database.sqlite.SQLiteException:表任务没有名为datetime:的列,编译时:插入任务(datetime,responsible,priority,name)值(?,,,,,?);
08-28 16:30:41.190:E/Database(8931):在android.Database.sqlite.SQLiteCompiledSql.native_compile(native方法)
08-28 16:30:41.190:E/Database(8931):在android.Database.sqlite.SQLiteCompiledSql.compiled(SQLiteCompiledSql.java:92)
08-28 16:30:41.190:E/Database(8931):在android.Database.sqlite.SQLiteCompiledSql.(SQLiteCompiledSql.java:65)
08-28 16:30:41.190:E/Database(8931):位于android.Database.sqlite.SQLiteProgram.(SQLiteProgram.java:83)
08-28 16:30:41.190:E/Database(8931):位于android.Database.sqlite.SQLiteStatement.(SQLiteStatement.java:41)
08-28 16:30:41.190:E/Database(8931):位于android.Database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1290)
08-28 16:30:41.190:E/Database(8931):在android.Database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1710)
08-28 16:30:41.190:E/Database(8931):位于android.Database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1567)
08-28 16:30:41.190:E/数据库(8931):位于com.id11078995.ghnaim.exercise1.TaskManagerApplication.addTask(TaskManagerApplication.java:64)
08-28 16:30:41.190:E/数据库(8931):位于com.id11078995.ghnaim.exercise1.AddTaskActivity.addTask(AddTaskActivity.java:59)
08-28 16:30:41.190:E/数据库(8931):位于com.id11078995.ghnaim.exercise1.AddTaskActivity.onOptionsItemSelected(AddTaskActivity.java:134)
08-28 16:30:41.190:E/Database(8931):at和roid.app.Activity.onMenuItemSelected(Activity.java:2211)
08-28 16:30:41.190:E/Database(8931):位于com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:775)
08-28 16:30:41.190:E/Database(8931):在com.android.internal.view.menu.menuitemmpl.invoke(menuitemmpl.java:143)上
08-28 16:30:41.190:E/Database(8931):位于com.android.internal.view.menu.MenuBuilder.performitemation(MenuBuilder.java:860)
08-28 16:30:41.190:E/Database(8931):在com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
08-28 16:30:41.190:E/Database(8931):在com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
08-28 16:30:41.190:E/数据库(8931):在android.view.view$PerformClick.run(view.java:9152)
08-28 16:30:41.190:E/Database(8931):位于android.os.Handler.handleCallback(Handler.java:587)
08-28 16:30:41.190:E/Database(8931):在android.os.Handler.dispatchMessage(Handler.java:92)
08-28 16:30:41.190:E/Database(8931):位于android.os.Looper.loop(Looper.java:130)
08-28 16:30:41.190:E/Database(8931):位于android.app.ActivityThread.main(ActivityThread.java:3691)
08-28 16:30:41.190:E/Database(8931):位于java.lang.reflect.Method.Invokenactive(本机方法)
08-28 16:30:41.190:E/Database(8931):位于java.lang.reflect.Method.invoke(Method.java:507)
08-28 16:30:41.190:E/Database(8931):在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
08-28 16:30:41.190:E/数据库(8931):位于com.android.internal.os.ZygoteInit.main(
@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_TASKS);
onCreate(db);
}
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(MySQLiteHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion);
boolean lDateTimeExists = isColumnExisting(TASK_DATETIME);
boolean lResponsible = isColumnExisting(TASK_RESPONSIBLE);
boolean lPrio = isColumnExisting(TASK_PRIORITY);
if (!lDateTime){
db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_DATETIME +" TEXT");
}
if (!lResponsible){
db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_RESPONSIBLE);
}
if (!lPrio){
db.execSQL("ALTER TABLE "+ TASKS_TABLE +" ADD COLUMN "+ TASK_PRIORITY +" TEXT");
}
}
private boolean isColumnExisting(String pColumnName){
try{
db.execSQL("SELECT "+pColumnName+" from "+TABLE_TASKS);
}catch(Exception e){
return false;
}
return true;
}