@Override
public void onCreate(SQLiteDatabase db)
{
try{
db.execSQL("create table " + NotificationManager.getUserStatic(context) + "log ("+
KEY_TIME +" INTEGER primary key, "+ KEY_TEXT +" TEXT not null);");
}
catch (SQLException e) {
e.printStackTrace();
}
}
/**
* onOpen method called when app is opening.
*/
@Override
public void onOpen(SQLiteDatabase db)
{
try{
System.out.println("tophere");
db.execSQL("create table if not exists "+DATABASE_NAME+"." + NotificationManager.getUserStatic(context) + "log ("+
KEY_TIME +" INTEGER primary key, "+ KEY_TEXT +" TEXT not null);");
System.out.println("downhere");
}
catch (SQLException e){
e.printStackTrace();
}
}
我们有用于为应用创建数据库的代码。问题是，据我们所知，它不会创建表，因此当我们尝试插入表并从中读取时，它会崩溃。我们已经尝试了所有东西，System.out.println可以看到它失败的地方。我们得到了tophere，但它永远不会到达日志中的downhere部分，所以我们猜测某些东西导致它在那里失败。我们已经使用DDMS检查过数据库是否在正确的文件夹中，因此数据库应该在那里，但由于某种原因它无法找到它（日志中的第2行和第3行）。
有什么想法吗？
这是错误日志：
04-27 10:45:46.768: I/System.out(6441): tophere
04-27 10:45:46.772: I/SqliteDatabaseCpp(6441): sqlite returned: error code = 1, msg = unknown database NOPO, db=/data/data/dmri.nopo/databases/NOPO
04-27 10:45:46.772: W/System.err(6441): android.database.sqlite.SQLiteException: unknown database NOPO: , while compiling: create table if not exists NOPO.log (time INTEGER primary key, text TEXT not null);
04-27 10:45:46.792: W/System.err(6441): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
04-27 10:45:46.792: W/System.err(6441): at android.database.sqlite.SQLiteCompiledSql.(SQLiteCompiledSql.java:68)
04-27 10:45:46.811: W/System.err(6441): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:134)
04-27 10:45:46.811: W/System.err(6441): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
04-27 10:45:46.811: W/System.err(6441): at android.database.sqlite.SQLiteStatement.acquireAndLock(SQLiteStatement.java:260)
04-27 10:45:46.811: W/System.err(6441): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:84)
04-27 10:45:46.811: W/System.err(6441): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1899)
04-27 10:45:46.823: W/System.err(6441): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1839)
04-27 10:45:46.823: W/System.err(6441): at dmri.nopo.DBAdapter$DatabaseHelper.onOpen(DBAdapter.java:67)
04-27 10:45:46.823: W/System.err(6441): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:180)
04-27 10:45:46.902: W/System.err(6441): at dmri.nopo.DBAdapter.open(DBAdapter.java:86)
04-27 10:45:46.912: W/System.err(6441): at dmri.nopo.LogManager.readLogFile(LogManager.java:32)
04-27 10:45:46.912: W/System.err(6441): at dmri.nopo.LogActivity.onCreate(LogActivity.java:25)
04-27 10:45:46.921: W/System.err(6441): at android.app.Activity.performCreate(Activity.java:4465)
04-27 10:45:46.921: W/System.err(6441): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-27 10:45:46.931: W/System.err(6441): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-27 10:45:46.931: W/System.err(6441): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-27 10:45:46.941: W/System.err(6441): at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-27 10:45:46.941: W/System.err(6441): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-27 10:45:46.953: W/System.err(6441): at android.os.Handler.dispatchMessage(Handler.java:99)
04-27 10:45:46.953: W/System.err(6441): at android.os.Looper.loop(Looper.java:137)
04-27 10:45:46.972: W/System.err(6441): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-27 10:45:46.972: W/System.err(6441): at java.lang.reflect.Method.invokeNative(Native Method)
04-27 10:45:46.972: W/System.err(6441): at java.lang.reflect.Method.invoke(Method.java:511)
04-27 10:45:46.982: W/System.err(6441): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-27 10:45:46.982: W/System.err(6441): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-27 10:45:46.992: W/System.err(6441): at dalvik.system.NativeStart.main(Native Method)
04-27 10:45:47.002: I/SqliteDatabaseCpp(6441): sqlite returned: error code = 1, msg = no such table: log, db=/data/data/dmri.nopo/databases/NOPO
04-27 10:45:47.012: D/AndroidRuntime(6441): Shutting down VM
04-27 10:45:47.012: W/dalvikvm(6441): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
04-27 10:45:47.181: E/AndroidRuntime(6441): FATAL EXCEPTION: main
04-27 10:45:47.181: E/AndroidRuntime(6441): java.lang.RuntimeException: Unable to start activity ComponentInfo{dmri.nopo/dmri.nopo.LogActivity}: android.database.sqlite.SQLiteException: no such table: log: , while compiling: SELECT time, text FROM log
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.os.Handler.dispatchMessage(Handler.java:99)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.os.Looper.loop(Looper.java:137)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-27 10:45:47.181: E/AndroidRuntime(6441): at java.lang.reflect.Method.invokeNative(Native Method)
04-27 10:45:47.181: E/AndroidRuntime(6441): at java.lang.reflect.Method.invoke(Method.java:511)
04-27 10:45:47.181: E/AndroidRuntime(6441): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-27 10:45:47.181: E/AndroidRuntime(6441): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-27 10:45:47.181: E/AndroidRuntime(6441): at dalvik.system.NativeStart.main(Native Method)
04-27 10:45:47.181: E/AndroidRuntime(6441): Caused by: android.database.sqlite.SQLiteException: no such table: log: , while compiling: SELECT time, text FROM log
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteCompiledSql.(SQLiteCompiledSql.java:68)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:127)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:94)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:53)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485)
04-27 10:45:47.181: E/AndroidRuntime(6441): at dmri.nopo.DBAdapter.getAllSMS(DBAdapter.java:116)
04-27 10:45:47.181: E/AndroidRuntime(6441): at dmri.nopo.LogManager.readLogFile(LogManager.java:34)
04-27 10:45:47.181: E/AndroidRuntime(6441): at dmri.nopo.LogActivity.onCreate(LogActivity.java:25)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.Activity.performCreate(Activity.java:4465)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-27 10:45:47.181: E/AndroidRuntime(6441): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-27 10:45:47.181: E/AndroidRuntime(6441): ... 11 more
答案 0 :(得分：3)
这将帮助你我尝试过它并且它也在工作
这只是一个例子
public class DatabaseMarks {
public static final String KEY_STUID = "stuid";
public static final String KEY_SUB1 = "subject_one";
public static final String KEY_SUB2 = "subject_two";
public static final String KEY_SUB3= "subject_three";
public static final String KEY_MARKS1= "marks_one";
public static final String KEY_MARKS2 = "marks_two";
public static final String KEY_MARKS3 = "marks_three";
private static final String DATABASE_NAME = "Student";
private static final String DATABASE_MARKSTABLE = "StudentMarks";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(" CREATE TABLE " + DATABASE_MARKSTABLE + " (" +
KEY_STUID + " TEXT PRIMARY KEY, " +
KEY_SUB1 + " TEXT NOT NULL, " +
KEY_SUB2 + " TEXT NOT NULL, " +
KEY_SUB3 + " TEXT NOT NULL, " +
KEY_MARKS1 + " INTEGER NOT NULL, " +
KEY_MARKS2 + " INTEGER NOT NULL, " +
KEY_MARKS3 + " INTEGER NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_MARKSTABLE);
onCreate(db);
}
}
public DatabaseMarks(Context c){
ourContext = c;
}
public DatabaseMarks open()throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public long createInsert(String stuid, String subject1, String subject2,
String subject3, String marks1, String marks2, String marks3) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_STUID, stuid);
cv.put(KEY_SUB1, subject1);
cv.put(KEY_SUB2, subject2);
cv.put(KEY_SUB3, subject3);
cv.put(KEY_MARKS1, marks1);
cv.put(KEY_MARKS2, marks2);
cv.put(KEY_MARKS3, marks3);
return ourDatabase.insert(DATABASE_MARKSTABLE, null, cv);
}
答案 1 :(得分：3)
首先，我建议使用android.util.Log记录Android中的异常。
第二 - 我怀疑你有创建错误名字的表。您的错误说查询找不到“日志”，但我看到您在“CREATE”语句中进行了一些串联。这可能是原因。
您可以查看实际创建的内容。通过查看创建的sqlite base。
您可以尝试：
adb shell cd /data/data/<your.package.name>/databases sqlite3 <yourdbname> .tables 答案 2 :(得分：1)
删除DATABASE_NAME部分SQL。
如果您想要NOPO数据库名称，并且想要创建表log，那么：
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, "NOPO", null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + "log" + " ("
+ KEY_TIME +" INTEGER primary key, "
+ KEY_TEXT +" TEXT not null);");
}
@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 log");
onCreate(db);
}
}
super(context, "NOPO", null, 2);使这个DatabaseHelper对象只在NOPO数据库环境中，因此您无需在SQL中指定它。
PS。我硬编码，你应该避免它。
答案 3 :(得分：0)
公共类LoginDataBaseAdapter { static final String DATABASE_NAME =“login.db”;
static final int DATABASE_VERSION = 1;
public static final int NAME_COLUMN = 1;
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
static final String DATABASE_CREATE = "create table "+"LOGIN"+
"( " +"ID"+" integer primary key autoincrement,"+ "USERNAME text,PASSWORD text,UNAME text); ";
// Variable to hold the database instance
public SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private DataBaseHelper dbHelper;
public LoginDataBaseAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public LoginDataBaseAdapter open() throws SQLException
{
db = dbHelper.getWritableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
答案 4 :(得分：-1)
public class DBHandler extends SQLiteOpenHelper {
private static String DATABASE_NAME = "mydb";
private static int DATABASE_VERSION = 1;
String TABLE_NAME = "Student";
String KEY_ID = "id";
String KEY_STUDENT_NAME = "name";
String KEY_STUDENT_MARKS = "marks";
public DBHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// creating table
String query = "CREATE TABLE " + TABLE_NAME +
" ( " +
KEY_ID + " INTEGER PRIMARY KEY," +
KEY_STUDENT_NAME + " TEXT," +
KEY_STUDENT_MARKS + " INTEGER"
" ) ";
db.execSQL(query);
// insertion in the table
ContentValues values = new ContentValues();
values.put(KEY_QUESTION_ID, "1");
values.put(KEY_STUDENT_NAME , "abc");
values.put(KEY_STUDENT_MARKS , "95");
db.insert(TABLE_NAME, null, values);
values.put(KEY_QUESTION_ID, "2");
values.put(KEY_STUDENT_NAME , "def");
values.put(KEY_STUDENT_MARKS , "93");
db.insert(TABLE_NAME, null, values);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
// Create tables again
onCreate(db);
}
// retrieve date
List<Student> getAllData(int Id) {
List<Student> student = new ArrayList<Student>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_NAME + " WHERE KEY_ID =" + "'" + Id + "'";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Student std = new Student();
u.setId(cursor.getInt(0));
u.setStudentName(cursor.getString(1));
u.setMarks(cursor.getString(2));
student.add(std);
} while (cursor.moveToNext());
}
// return student list
return student;
}
}
public class Student {
public static int Id;
public static String studentName;
public static int marks;
public int getId() {
return Id;
}
public static void setId(int id) {
Id = id;
}
public String getStudentName() {
return studentName;
}
public static void setStudentName(String studentName) {
Student.studentName = studentName;
}
public int getMarks() {
return marks;
}
public static void setMarks(int marks) {
Student.marks = marks;
}
}
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DBHandler db = new DBHandler(getApplicationContext());
List<Student> std = new ArrayList<Student>();
rl = db.getAllData(1);
for (Student s : std) {
Log.v("Id",s.getId());
Log.v("Name",s.getStudentName());
Log.v("Marks",s.getMarks());
}
}
}