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强文本我正在使用带有 android sdk r18 的 eclipse 来执行一些数据库操作：

我有一个名为“advance_search”的视图，并存储了一些有关请求调用的数据。

现在我想使用一个简单的 rawquery 函数从数据库中轮询一些记录。但我失败了！不知道为什么！！

谁能给我一些建议？

日志：

05-11 06:37:11.057: E/Status(1306): Database Initialize OK!
05-11 06:37:11.098: E/Status(1306): Starting Database Check procedure
05-11 06:37:11.098: E/Status(1306): Database already exist!
05-11 06:37:11.117: E/Status(1306): Open Database OK
05-11 06:37:11.117: E/LogSQLProcess(1306): String id is :6326
05-11 06:37:11.138: E/LogSQLProcess(1306): SQLiteDatabase in READ MODE!
05-11 06:37:11.148: E/LogSQLProcess(1306): DB Query Logon_info View complete!
05-11 06:37:11.148: E/LogSQLProcess(1306): Cursor moved to Position 0!
05-11 06:37:11.148: E/LogSQLProcess(1306): USER Name is John
05-11 06:37:11.168: D/AndroidRuntime(1306): Shutting down VM
05-11 06:37:11.168: W/dalvikvm(1306): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-11 06:37:11.178: E/AndroidRuntime(1306): FATAL EXCEPTION: main
05-11 06:37:11.178: E/AndroidRuntime(1306): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.TicketDroid.PKG/com.TicketDroid.PKG.User_Search}: java.lang.ArrayIndexOutOfBoundsException
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.os.Looper.loop(Looper.java:123)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at java.lang.reflect.Method.invokeNative(Native Method)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at java.lang.reflect.Method.invoke(Method.java:507)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at dalvik.system.NativeStart.main(Native Method)
05-11 06:37:11.178: E/AndroidRuntime(1306): Caused by: java.lang.ArrayIndexOutOfBoundsException
05-11 06:37:11.178: E/AndroidRuntime(1306):     at com.TicketDroid.PKG.User_Search.onCreate(User_Search.java:105)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-11 06:37:11.178: E/AndroidRuntime(1306):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-11 06:37:11.178: E/AndroidRuntime(1306):     ... 11 more

com.TicketDroid.PKG/com.TicketDroid.PKG.User_Search 是我的 JAVA 文件

数据库操作代码：

    public Cursor UserSearch(String id) {
    // TODO Auto-generated method stub
    Log.e("LogSQLProcess", "String id is :"+id);
    SQLiteDatabase dbs = this.getReadableDatabase();
    Log.e("LogSQLProcess", "SQLiteDatabase in READ MODE!");
    String selectionArgs[] = new String[] {id};
    Cursor n=dbs.rawQuery("SELECT * FROM logon_info WHERE _id= ?", selectionArgs);
    Log.e("LogSQLProcess", "DB Query Logon_info View complete!");
    n.moveToPosition(0);
    Log.e("LogSQLProcess", "Cursor moved to Position 0!");
    String name=n.getString(0);
    Log.e("LogSQLProcess", "USER Name is "+name);
    String Args[] = new String[] {name};
    return dbs.rawQuery("select * from advance_search where REQUEST_PERSON= ?", Args);

我已经在 sqlite3 NAD 中测试了 sql 语句，肯定可以正常工作！

很抱歉造成不便！

这是完整的代码：

DBInitialize.java

 public class DB_Initialize extends SQLiteOpenHelper{

//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.TicketDroid.PKG/databases/";

private static String DB_NAME = "TicketDroid";
private static String DB = "TicketDroid";
private SQLiteDatabase myDataBase;  
private final Context myContext;    
public static String LOGON_TABLE = "LOGON";
public static String LOGON_VIEW = "logon_info";
public static String TICKET_VIEW = "advance_search";


public DB_Initialize(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
    Log.e("Status", "Database Initialize OK!");
}   

public void createDataBase() throws IOException{

    boolean dbExist = checkDataBase();

    if(dbExist){
        //do nothing - database already exist
    }else{

        this.getReadableDatabase();
        Log.e("Status", "Create Database in REAED MODE");

        try {

            copyDataBase();

        } catch (IOException e) {

            throw new Error("Error copying database");

        }
    }

}

private boolean checkDataBase(){

    SQLiteDatabase checkDB = null;

    try{
        String Path = DB_PATH + DB;
        checkDB = SQLiteDatabase.openDatabase(Path, null, SQLiteDatabase.OPEN_READONLY);
        Log.e("Status", "Starting Database Check procedure");

    }catch(SQLiteException e){
        Log.e("Status", "Database doesn't exist!");
        //database does't exist yet.

    }

    if(checkDB != null){

        checkDB.close();
        Log.e("Status", "Database already exist!");

    }

    return checkDB != null ? true : false;
}


private void copyDataBase() throws IOException{
    Log.e(" Status :","Prepare to copy database!" );

    InputStream myInput = myContext.getAssets().open(DB_NAME); 
    String outFileName = DB_PATH + DB_NAME;
    OutputStream myOutput = new FileOutputStream(outFileName);
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer))>0){
        myOutput.write(buffer, 0, length);
    } 
    Log.e("Status", "Copy Database file complete");
    //Close the streams
    Log.e(" Status :","Prepare to Close file stream!" );
    myOutput.flush();
    myOutput.close();
    myInput.close();
    Log.e("Status", "Closed file stream!");

}

public void openDataBase() throws SQLException{

    //Open the database
    String myPath = DB_PATH + DB_NAME;
    myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
    Log.e("Status", "Open Database OK");

}

@Override
public synchronized void close() {

        if(myDataBase != null)
            myDataBase.close();
        Log.e("Status", "Database closed");
        super.close();

}

@Override
public void onCreate(SQLiteDatabase db) {

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}


public Cursor UserSearch(String id) {
    // TODO Auto-generated method stub
    Log.e("LogSQLProcess", "String id is :"+id);
    SQLiteDatabase dbs = this.getReadableDatabase();
    Log.e("LogSQLProcess", "SQLiteDatabase in READ MODE!"); 
    String selectionArgs[] = new String[] {id};
    Cursor n=dbs.rawQuery("SELECT * FROM logon_info WHERE _id= ?", selectionArgs);
    Log.e("LogSQLProcess", "DB Query Logon_info View complete!");
    n.moveToPosition(0);
    Log.e("LogSQLProcess", "Cursor moved to Position 0!");
    String name=n.getString(0);
    Log.e("LogSQLProcess", "USER Name is "+name);
    n.close();
    String Args[] = new String[] {name};
    return dbs.rawQuery("select * from advance_search where REQUEST_PERSON= ?", Args); }

用户搜索.java

public class User_Search extends Activity implements OnClickListener {

Button srhu_back,srhu_next,srhu_previous;
TextView tv_result;

String Password;
String Type;
String ID;



Integer count=0;
Cursor srh = null;
ArrayList<String> array=new ArrayList<String>(); 
String str[]={};
String strg="";


String[] rset=new String[] {
      "REQUEST_PERSON","USER_EXT",
        "DEPARTMENT_CODE","EMAIL_ADDR",
        "_id","TICKET_Title",
        "PROBLEM_SOFT","CATEGORY",
        "SYMPTONS","CONTACT",
        "STATUS","FINISH_DATE","ACTIONS",
        "ENGINEER1","ENGINEER1_EXT",
        "ENGINEER1","ENGINEER1_EXT",
};


String res = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.user_search);
    srhu_back = (Button) findViewById(R.id.srhu_bBack);
    srhu_next = (Button) findViewById(R.id.srhu_bNext);
    srhu_previous = (Button) findViewById(R.id.srhu_bPrevious);
    tv_result = (TextView) findViewById(R.id.srhu_tvresult);
    srhu_back.setOnClickListener(this);
    srhu_next.setOnClickListener(this);
    srhu_previous.setOnClickListener(this);



    Bundle bundle = getIntent().getExtras();     
      Password=bundle.getString("Password");
      Type=bundle.getString("Type");
      ID=bundle.getString("ID");   



        DB_Initialize srh_ret = new DB_Initialize(User_Search.this);

           try {     
               srh_ret.createDataBase();

            } catch (IOException ioe) {          
            throw new Error("Unable to create database");            
            }
            try {
                srh_ret.openDataBase();
            }catch(SQLException sqle){
                throw sqle;
            }

                try {
                    srh=srh_ret.UserSearch(ID);
                }                   
                 catch (Exception e) {
                    e.printStackTrace();
                     Toast.makeText(User_Search.this, "Cannot Fetch any records!", Toast.LENGTH_LONG).show();
                } finally {             

                    for(srh.moveToFirst(); srh.moveToNext(); srh.isAfterLast()) {
                        // The Cursor is now set to the right position
                        for(int i=0; i<=16; i++) {
                            if (srh.isNull(i)) strg="N/A"; 
                            else strg=srh.getString(i);
                            res = res+rset[i]+ " : "+strg+"\n"; 
                            Log.e("TextString","result is "+res+"\n");
                        }
                        array.add(res);  
                    }

                }
                tv_result.setText(str[count]);  
                count++;
    Toast.makeText(User_Search.this, "Record Searching Successful!", Toast.LENGTH_LONG).show();  }

日志：

05-11 09:18:29.807: D/dalvikvm(370): GC_EXTERNAL_ALLOC freed 50K, 53% free 2553K/5379K, external 1625K/2137K, paused 60ms
05-11 09:18:35.807: W/KeyCharacterMap(370): No keyboard for id 0
05-11 09:18:35.807: W/KeyCharacterMap(370): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
05-11 09:18:39.187: E/Status(370): Database Initialize OK!
05-11 09:18:39.237: E/Status(370): Starting Database Check procedure
05-11 09:18:39.247: E/Status(370): Database already exist!
05-11 09:18:39.268: E/Status(370): Open Database OK
05-11 09:18:39.287: E/LogSQLProcess(370): SQLiteDatabase in READ MODE!
05-11 09:18:39.287: E/LogSQLProcess(370): SQLiteQueryBuilder created!
05-11 09:18:39.297: E/LogSQLProcess(370): SQLiteQueryBuilder set Table!
05-11 09:18:39.297: E/LogSQLProcess 0(370): John
05-11 09:18:39.297: E/LogSQLProcess 1(370): john
05-11 09:18:39.306: E/LogSQLProcess 2(370): USER
05-11 09:18:39.306: E/LogSQLProcess 3(370): 6326
05-11 09:18:39.306: V/CursorValues(370): Johnjohn
05-11 09:18:39.306: V/CursorValues After Moved to First(370): Johnjohn
05-11 09:18:39.306: V/Values(370): John/john
05-11 09:18:39.306: V/CursorValues Now(370): Johnjohn
05-11 09:18:39.306: E/Check Logon Process(370): user and password entered correct!
05-11 09:18:39.306: E/Check Logon Process(370): JohnjohnUSER6326
05-11 09:18:39.326: E/Status(370): Database closed
05-11 09:18:39.337: V/USER TYPE SELECT :(370): USER
05-11 09:18:41.927: E/Status(370): Database Initialize OK!
05-11 09:18:41.946: E/Status(370): Starting Database Check procedure
05-11 09:18:41.946: E/Status(370): Database already exist!
05-11 09:18:41.966: E/Status(370): Open Database OK
05-11 09:18:41.966: E/LogSQLProcess(370): String id is :6326
05-11 09:18:41.997: E/LogSQLProcess(370): SQLiteDatabase in READ MODE!
05-11 09:18:41.997: E/LogSQLProcess(370): DB Query Logon_info View complete!
05-11 09:18:41.997: E/LogSQLProcess(370): Cursor moved to Position 0!
05-11 09:18:41.997: E/LogSQLProcess(370): USER Name is John
05-11 09:18:42.018: D/AndroidRuntime(370): Shutting down VM
05-11 09:18:42.018: W/dalvikvm(370): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-11 09:18:42.027: E/AndroidRuntime(370): FATAL EXCEPTION: main
05-11 09:18:42.027: E/AndroidRuntime(370): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.TicketDroid.PKG/com.TicketDroid.PKG.User_Search}: java.lang.ArrayIndexOutOfBoundsException
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.os.Looper.loop(Looper.java:123)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread.main(ActivityThread.java:3683)
05-11 09:18:42.027: E/AndroidRuntime(370):  at java.lang.reflect.Method.invokeNative(Native Method)
05-11 09:18:42.027: E/AndroidRuntime(370):  at java.lang.reflect.Method.invoke(Method.java:507)
05-11 09:18:42.027: E/AndroidRuntime(370):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-11 09:18:42.027: E/AndroidRuntime(370):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-11 09:18:42.027: E/AndroidRuntime(370):  at dalvik.system.NativeStart.main(Native Method)
05-11 09:18:42.027: E/AndroidRuntime(370): Caused by: java.lang.ArrayIndexOutOfBoundsException
05-11 09:18:42.027: E/AndroidRuntime(370):  at com.TicketDroid.PKG.User_Search.onCreate(User_Search.java:122)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-11 09:18:42.027: E/AndroidRuntime(370):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-11 09:18:42.027: E/AndroidRuntime(370):  ... 11 more
05-11 09:18:46.587: I/Process(370): Sending signal. PID: 370 SIG: 9
4

2 回答 2

0

引起：java.lang.ArrayIndexOutOfBoundsException

在您的 onCreate 方法中。

n.moveToPosition(0);在先检查它是否不为空之前...执行此操作

if(n.moveToFirst()==true) {
     String name = n.getString(n.getColumnIndex(<column name>));
}
于 2012-05-11T07:02:29.170 回答
0

为什么不调试应用程序，以便在遇到异常时 Eclipse 会中断。然后您可以查看所有变量和堆栈调用，看看您错过了什么。它在你的代码中的某个地方。

于 2012-05-11T15:06:01.457 回答