我已经建立了一个SQLite数据库。似乎当我运行一个需要访问它的类时，应用程序崩溃了。最初有人向我指出，表创建语句是问题，但在错误解决之后它仍然无效。数据库设置是： -
public class DataBaseHelper
{
public static final String KEY_ROWID = "_id";
public static final String KEY_CODE = "code";
public static final String KEY_DAYS = "days";
public static final String KEY_BMI = "bmi";
public static final String KEY_ROWID2 = "id2";
public static final String KEY_DATE = "date";
public static final String KEY_STEPS = "steps";
public static final String KEY_CALs = "calories";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "workout";
private static final String DATABASE_TABLE = "goals";
private static final String DATATABLE = "acts";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"create table goals (_id integer primary key autoincrement, "
+ "code text not null, days text not null, "
+ "bmi text not null);";
private static final String DATABASE_CREATE2 =
"create table acts (id2 integer primary key autoincrement, "
+ "date text not null, steps text not null, "
+ "calories text not null);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DataBaseHelper(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
db.execSQL(DATABASE_CREATE2);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion
+ " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
//---opens the database---
public DataBaseHelper open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a title into the database---
public long insertTitle(String isbn, String title, String publisher)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_CODE, isbn);
initialValues.put(KEY_DAYS, title);
initialValues.put(KEY_BMI, publisher);
return db.insert(DATABASE_TABLE, null, initialValues);
}
public long insertActivity(String date, String steps, String Calories)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_DATE, date);
initialValues.put(KEY_STEPS, steps);
initialValues.put(KEY_CALs, Calories);
return db.insert(DATATABLE, null, initialValues);
}
//---deletes a particular title---
public boolean deleteTitle(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID +
"=" + rowId, null) > 0;
}
public void deleteFirst()
{
Cursor cursor = db.query(DATABASE_TABLE, null, null, null, null, null, null);
if(cursor.moveToFirst()) {
long rowId = cursor.getLong(cursor.getColumnIndex(KEY_ROWID));
db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null);
}
}
public boolean deleteAct(long rowId)
{
return db.delete(DATATABLE, KEY_ROWID +
"=" + rowId, null) > 0;
}
//---retrieves all the titles---
public Cursor getAllTitles()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_CODE,
KEY_DAYS,
KEY_BMI},
null,
null,
null,
null,
null);
}
public Cursor getAllActs()
{
return db.query(DATATABLE, new String[] {
KEY_ROWID2,
KEY_DATE,
KEY_STEPS,
KEY_CALs},
null,
null,
null,
null,
null);
}
//---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_CODE,
KEY_DAYS,
KEY_BMI
},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public Cursor getAct(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATATABLE, new String[] {
KEY_ROWID2,
KEY_DATE,
KEY_STEPS,
KEY_CALs
},
KEY_ROWID2 + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateAct(long rowId, String date,
String steps, String cals)
{
ContentValues args = new ContentValues();
args.put(KEY_DATE, date);
args.put(KEY_STEPS, steps);
args.put(KEY_CALs, cals);
return db.update(DATATABLE, args,
KEY_ROWID2 + "=" + rowId, null) > 0;
}
//---updates a title---
public boolean updateTitle(long rowId, String isbn,
String title, String publisher)
{
ContentValues args = new ContentValues();
args.put(KEY_CODE, isbn);
args.put(KEY_DAYS, title);
args.put(KEY_BMI, publisher);
return db.update(DATABASE_TABLE, args,
KEY_ROWID + "=" + rowId, null) > 0;
}
}
并且Log cat是：
04-06 17:20:14.561: E/AndroidRuntime(24550): FATAL EXCEPTION: main
04-06 17:20:14.561: E/AndroidRuntime(24550): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.b00348312.workout/com.b00348312.workout.WorkoutProgress}: android.database.sqlite.SQLiteException: no such column: bmi: , while compiling: SELECT _id, code, days, bmi FROM goals
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2787)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2803)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread.access$2300(ActivityThread.java:135)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.os.Looper.loop(Looper.java:144)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread.main(ActivityThread.java:4937)
04-06 17:20:14.561: E/AndroidRuntime(24550): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 17:20:14.561: E/AndroidRuntime(24550): at java.lang.reflect.Method.invoke(Method.java:521)
04-06 17:20:14.561: E/AndroidRuntime(24550): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-06 17:20:14.561: E/AndroidRuntime(24550): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-06 17:20:14.561: E/AndroidRuntime(24550): at dalvik.system.NativeStart.main(Native Method)
04-06 17:20:14.561: E/AndroidRuntime(24550): Caused by: android.database.sqlite.SQLiteException: no such column: bmi: , while compiling: SELECT _id, code, days, bmi FROM goals
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1412)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1296)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1251)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1331)
04-06 17:20:14.561: E/AndroidRuntime(24550): at com.b00348312.workout.DataBaseHelper.getAllTitles(DataBaseHelper.java:131)
04-06 17:20:14.561: E/AndroidRuntime(24550): at com.b00348312.workout.WorkoutProgress.fillData(WorkoutProgress.java:27)
04-06 17:20:14.561: E/AndroidRuntime(24550): at com.b00348312.workout.WorkoutProgress.onCreate(WorkoutProgress.java:22)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1069)
04-06 17:20:14.561: E/AndroidRuntime(24550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2751)
04-06 17:20:14.561: E/AndroidRuntime(24550): ... 11 more
我告诉我的问题是：
04-06 17:20:14.561: E/AndroidRuntime(24550): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.b00348312.workout/com.b00348312.workout.WorkoutProgress}: android.database.sqlite.SQLiteException: no such column: bmi: , while compiling: SELECT _id, code, days, bmi FROM goals
但是我不会在它所指的地方每次调用字段bmi时似乎都没有问题。有什么我想念的吗？
答案 0 :(得分：2)
您正在尝试访问数据库中名为“bmi”的列，但该列不存在。
您很可能在创建数据库后添加了列，并且未修改openHelper以正确升级数据库。
添加“bmi”字段，将解决错误。由于数据库已存在，因此更改Create语句是不够的，因此不会运行Create语句。您应该覆盖“onUpgrade”以从一个数据库版本更改为另一个数据库版本。
或者删除当前数据库并从头开始重新创建。
答案 1 :(得分：1)
你必须卸载然后重新安装你的应用程序，因为如果没有实现onUpgrade，android不会更改数据库。
或转到设置和您的应用并清除应用数据，然后运行您的应用。