我有一个员工详细信息的数据库，我想从database.am获取密码试图获取值但面临问题。如何从数据库中检索密码....我有列keyid，姓名，姓氏，手机，发布日期，电子邮件，性别，个人ID，加入日期，安全问题，答案，用户名，密码。
需要检索密码值
public List<String> credientials(String eid) {
List<String> labels = new ArrayList<String>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_EMPLOY, new String[] {
KEY_PASSWORD,
}, KEY_USERNAME + " = ?", new String[] { String.valueOf(eid) }, null, null, null, null);
if (cursor != null){
do{
cursor.moveToFirst();
labels.add(cursor.getString(12));
} while (cursor.moveToNext());
}cursor.close();
db.close();
return labels;
}
我的错误日志Cat
09-13 13:24:00.354: E/AndroidRuntime(28252): FATAL EXCEPTION: main
09-13 13:24:00.354: E/AndroidRuntime(28252): java.lang.OutOfMemoryError: [memory exhausted]
09-13 13:24:00.354: E/AndroidRuntime(28252): at dalvik.system.NativeStart.main(Native Method)
09-13 13:24:00.373: E/SQLiteDatabase(28252): close() was never explicitly called on database '/data/data/com.example.analyticbeans/databases/jk'
09-13 13:24:00.373: E/SQLiteDatabase(28252): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1943)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1007)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1051)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:770)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:231)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.example.analyticbeans.dataBaseHelper.credientials(dataBaseHelper.java:129)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.example.analyticbeans.existinguserActivity.getData(existinguserActivity.java:86)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.example.analyticbeans.existinguserActivity.login(existinguserActivity.java:80)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.example.analyticbeans.existinguserActivity$1.onClick(existinguserActivity.java:55)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.view.View.performClick(View.java:3511)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.view.View$PerformClick.run(View.java:14105)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.os.Handler.handleCallback(Handler.java:605)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.os.Handler.dispatchMessage(Handler.java:92)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.os.Looper.loop(Looper.java:137)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at java.lang.reflect.Method.invokeNative(Native Method)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at java.lang.reflect.Method.invoke(Method.java:511)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-13 13:24:00.373: E/SQLiteDatabase(28252): at dalvik.system.NativeStart.main(Native Method)
09-13 13:24:00.484: E/System(28252): Uncaught exception thrown by finalizer
09-13 13:24:00.573: E/System(28252): java.lang.IllegalStateException: Don't have database lock!
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2090)
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2182)
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2178)
09-13 13:24:00.573: E/System(28252): at android.util.LruCache.trimToSize(LruCache.java:197)
09-13 13:24:00.573: E/System(28252): at android.util.LruCache.evictAll(LruCache.java:285)
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase.deallocCachedSqlStatements(SQLiteDatabase.java:2143)
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1126)
09-13 13:24:00.573: E/System(28252): at android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:1914)
09-13 13:24:00.573: E/System(28252): at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:182)
09-13 13:24:00.573: E/System(28252): at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
09-13 13:24:00.573: E/System(28252): at java.lang.Thread.run(Thread.java:856)
更新错误
09-13 14:08:19.173: E/AndroidRuntime(13156): FATAL EXCEPTION: main
09-13 14:08:19.173: E/AndroidRuntime(13156): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 2
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:400)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.example.analyticbeans.dataBaseHelper.credientials(dataBaseHelper.java:136)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.example.analyticbeans.existinguserActivity.getData(existinguserActivity.java:86)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.example.analyticbeans.existinguserActivity.login(existinguserActivity.java:80)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.example.analyticbeans.existinguserActivity$1.onClick(existinguserActivity.java:55)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.view.View.performClick(View.java:3511)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.view.View$PerformClick.run(View.java:14105)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.os.Handler.handleCallback(Handler.java:605)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.os.Handler.dispatchMessage(Handler.java:92)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.os.Looper.loop(Looper.java:137)
09-13 14:08:19.173: E/AndroidRuntime(13156): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-13 14:08:19.173: E/AndroidRuntime(13156): at java.lang.reflect.Method.invokeNative(Native Method)
09-13 14:08:19.173: E/AndroidRuntime(13156): at java.lang.reflect.Method.invoke(Method.java:511)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-13 14:08:19.173: E/AndroidRuntime(13156): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-13 14:08:19.173: E/AndroidRuntime(13156): at dalvik.system.NativeStart.main(Native Method)
更新我的完整代码
package com.example.analyticbeans;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class dataBaseHelper extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "jk";
// employee table name
private static final String TABLE_EMPLOY = "employeeTable";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_FIRST_NAME ="firstName";
private static final String KEY_LAST_NAME ="lastName";
private static final String KEY_BIRTH ="birth";
private static final String KEY_MOBILENO="MobileNo";
private static final String KEY_GENDER="Gender";
private static final String KEY_PERSONALMAIL="PersonalMail";
private static final String KEY_ADDRESS="Address";
private static final String KEY_JOINING="Joining";
private static final String KEY_OFFICIALMAIL="OfficialMail";
private static final String KEY_QUESTION="Question";
private static final String KEY_ANSWER="Answer";
private static final String KEY_USERNAME="userName";
private static final String KEY_PASSWORD="password";
private String labels;
public dataBaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_EMP_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_EMPLOY + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_FIRST_NAME + " TEXT ,"
+ KEY_LAST_NAME + " TEXT ," + KEY_BIRTH + " TEXT ,"+ KEY_MOBILENO + " NUMBER ,"
+ KEY_GENDER + " TEXT ,"+ KEY_PERSONALMAIL + " TEXT ,"
+ KEY_ADDRESS + " TEXT ,"+ KEY_JOINING + " TEXT ,"
+ KEY_OFFICIALMAIL + " TEXT ,"+ KEY_QUESTION + " TEXT ,"
+ KEY_ANSWER + " TEXT ,"
+ KEY_USERNAME + " TEXT ," + KEY_PASSWORD + " TEXT "+ ")";
db.execSQL(CREATE_EMP_TABLE);
}
public void insertData(String firstname, String lastname,String birth,String mobile ,String spingender,
String personalmail, String address,String joining,String official,String question,String answer,String username,
String password) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_FIRST_NAME, firstname);
values.put(KEY_LAST_NAME, lastname);
values.put(KEY_BIRTH, birth);
values.put(KEY_MOBILENO,mobile);
values.put(KEY_GENDER,spingender);
values.put(KEY_PERSONALMAIL,personalmail);
values.put(KEY_ADDRESS, address);
values.put(KEY_JOINING, joining);
values.put(KEY_OFFICIALMAIL,official);
values.put(KEY_QUESTION, question);
values.put(KEY_ANSWER, answer);
values.put(KEY_USERNAME, username);
values.put(KEY_PASSWORD, password);
db.insert(TABLE_EMPLOY, null, values);
db.close();
}
public List<String> getContact(String eid){
SQLiteDatabase db = this.getReadableDatabase();
List<String> labels = new ArrayList<String>();
Cursor cursor = db.query(TABLE_EMPLOY, new String[] {
KEY_ID,
KEY_FIRST_NAME,
KEY_LAST_NAME,KEY_BIRTH,KEY_MOBILENO,KEY_GENDER,KEY_PERSONALMAIL,KEY_JOINING,
KEY_OFFICIALMAIL,KEY_QUESTION,KEY_ANSWER,KEY_PASSWORD
}, KEY_USERNAME + " = ?", new String[] { String.valueOf(eid) }, null, null, null, null);
if (cursor != null){
do{
cursor.moveToFirst();
labels.add(cursor.getString(0));
labels.add(cursor.getString(1));
labels.add(cursor.getString(2));
labels.add(cursor.getString(3));
labels.add(cursor.getString(4));
labels.add(cursor.getString(5));
labels.add(cursor.getString(6));
labels.add(cursor.getString(7));
labels.add(cursor.getString(8));
labels.add(cursor.getString(9));
labels.add(cursor.getString(10));
labels.add(cursor.getString(11));
labels.add(cursor.getString(13));
} while (cursor.moveToNext());
}cursor.close();
db.close();
// returning lables
return labels;
}
public List<String> credientials(String eid) {
List<String> labels = new ArrayList<String>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_EMPLOY, new String[] {
KEY_PASSWORD,
}, KEY_USERNAME + " = ?", new String[] { String.valueOf(eid) }, null, null, null, null);
if (cursor.getCount()>0){
cursor.moveToFirst();
do{
labels.add(cursor.getString(13));
} while (cursor.moveToNext());
}
cursor.close();
return labels;
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
}
答案 0 :(得分：0)
我认为你的问题不是数据库，而是do-while循环没有正确实现：
do {
cursor.moveToFirst();
labels.add(cursor.getString(12));
} while (cursor.moveToNext());
将其更改为：
if (cursor != null && cursor.moveToFirst()) {
do {
labels.add(cursor.getString(12)); // use rather getColumnIndex(<colname>)
} while (cursor.moveToNext());
}
在您的原始情况下，您创建了无限循环（first-＆gt; next-＆gt; first-＆gt; next）。这导致：
java.lang.OutOfMemoryError
答案 1 :(得分：0)
问题是你在这里创建一个无限循环：
do{
cursor.moveToFirst();
labels.add(cursor.getString(12));
} while (cursor.moveToNext());
执行cursor.moveToFirst();时，将光标置于第一个位置，最后一条指令为cursor.moveToNext()，使光标向前移动
您只需要在cursor.moveToFirst();
答案 2 :(得分：0)
您刚查询了一列。你的索引是错误的。不要将moveToFirst置于循环中。请记住抓住异常。
public List<String> credientials(String eid) {
List<String> labels = new ArrayList<String>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_EMPLOY, new String[] {
KEY_PASSWORD,
}, KEY_USERNAME + " = ?", new String[] { String.valueOf(eid) }, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()){
do{
labels.add(cursor.getString(0)); // KEY_PASSWORD
} while (cursor.moveToNext());
}
}
finally {
if (cursor != null) {
cursor.close();
}
if (db != null) {
db.close();
}
}
return labels;
}