我使用SQLite数据库浏览器创建了我的数据库，并将其存储在项目的assets文件夹中。当我试图从该文件夹中获取数据时显示错误
03-28 01:07:39.840: E/AndroidRuntime(7390): FATAL EXCEPTION: main
03-28 01:07:39.840: E/AndroidRuntime(7390): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pocketdr/com.example.pocketdr.PocketDoc}: android.database.sqlite.SQLiteException: near "/": syntax error: , while compiling: /data/data/com.example.pocketdr/databases/Diseases.db/Diseaseslist/
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1872)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread.access$1500(ActivityThread.java:135)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.os.Handler.dispatchMessage(Handler.java:99)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.os.Looper.loop(Looper.java:150)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread.main(ActivityThread.java:4385)
03-28 01:07:39.840: E/AndroidRuntime(7390): at java.lang.reflect.Method.invokeNative(Native Method)
03-28 01:07:39.840: E/AndroidRuntime(7390): at java.lang.reflect.Method.invoke(Method.java:507)
03-28 01:07:39.840: E/AndroidRuntime(7390): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
03-28 01:07:39.840: E/AndroidRuntime(7390): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
03-28 01:07:39.840: E/AndroidRuntime(7390): at dalvik.system.NativeStart.main(Native Method)
03-28 01:07:39.840: E/AndroidRuntime(7390): Caused by: android.database.sqlite.SQLiteException: near "/": syntax error: , while compiling: /data/data/com.example.pocketdr/databases/Diseases.db/Diseaseslist/
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:73)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1442)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1410)
03-28 01:07:39.840: E/AndroidRuntime(7390): at com.example.pocketdr.Database.getSymptom(Database.java:215)
03-28 01:07:39.840: E/AndroidRuntime(7390): at com.example.pocketdr.PocketDoc.onCreate(PocketDoc.java:60)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
03-28 01:07:39.840: E/AndroidRuntime(7390): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836)
03-28 01:07:39.840: E/AndroidRuntime(7390): ... 11 more
DATABASE Helper CLASS
public class Database extends SQLiteOpenHelper{
private static String DB_PATH = "/data/data/com.example.pocketdr/databases/";
private static final String DB_NAME = "Diseases.db";
private static final int DB_VERSION_NUMBER = 1;
public static final String DB_TABLE_NAME = "Diseaseslist";
private static final String _ID="id";
public static final String COLUMN_1_NAME = "Name";
private static final String COLUMN_2_Symptom="Symptom";
private static final String COLUMN_3_Symptom1="Symptom1";
private static final String COLUMN_4_Symptom2="Symptom2";
private static final String COLUMN_5_Symptom3="Symptom3";
private static final String COLUMN_6_Discription="Discription";
private static final String COLUMN_7_Precaution="Precaution";
String[] str,str1,str2;
private SQLiteDatabase sqliteDBInstance ;
private final Context myContext;
public Database(Context context) {
super(context, DB_NAME, null, DB_VERSION_NUMBER);
this.myContext = context;
}
public void createDataBase() throws IOException
{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
sqliteDBInstance = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(sqliteDBInstance != null)
sqliteDBInstance.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase sqliteDBInstance) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
public long insertDiseases(String Name,String Symptom,String Symptom1,String Symptom2,String Symptom3,String Description, String Precaution)
{
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_1_NAME, Name);
contentValues.put(COLUMN_2_Symptom, Symptom);
contentValues.put(COLUMN_3_Symptom1, Symptom1);
contentValues.put(COLUMN_4_Symptom2, Symptom2);
contentValues.put(COLUMN_5_Symptom3, Symptom3);
contentValues.put(COLUMN_6_Discription, Description);
contentValues.put(COLUMN_7_Precaution, Precaution);
Log.i(this.toString() + " - insertCountry", "Inserting: " + Name);
return this.sqliteDBInstance.insert(DB_TABLE_NAME, null, contentValues);
}
public boolean removeDiseases(String Name)
{
int result = this.sqliteDBInstance.delete(DB_TABLE_NAME, "Name='" + Name + "'", null);
if(result > 0)
return true;
else
return false;
}
public long updateCountry(String oldName, String newName)
{
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_1_NAME, newName);
return this.sqliteDBInstance.update(DB_TABLE_NAME, contentValues, "Name='" + oldName + "'", null);
}
public String[] getSymptom()
{
String myPath1 = DB_PATH + DB_NAME+"/"+DB_TABLE_NAME+"/" ;
Cursor cursor = this.sqliteDBInstance.rawQuery(myPath1, new String[]{COLUMN_2_Symptom});//query(myPath1, new String[] {COLUMN_2_Symptom}, null, null, null, null, null);
Log.i(COLUMN_2_Symptom, "Symptom"+cursor);
if(cursor.getCount() >0)
{
str = new String[cursor.getCount()];
int i = 0;
while (cursor.moveToNext())
{
str[i] = cursor.getString(cursor.getColumnIndex(COLUMN_2_Symptom));
i++;
}
return str;
}
else
{
return new String[] {};
}
}
答案 0 :(得分：0)
public String[] getSymptom()
{
String myPath1 = DB_PATH + DB_NAME+"/"+DB_TABLE_NAME+"/" ;
Cursor cursor = this.sqliteDBInstance.rawQuery(myPath1, new String[]{COLUMN_2_Symptom});
}
您的字符串myPath1应包含有效的SQLite查询，而不是数据库表的路径。
尝试类似“select * from your_tablename Where column_name = value”
或者您可以使用查询而不是rawQuery。请参阅this