将数据库安装到android项目时遇到困难

Question

我一直在关注This在android项目中实现数据库的指南。

这是我将对DBAdapter类的代码：

package com.sab.namespace; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

public class DBAdapter 
{ 
    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_PROPERTYID = "propertyid"; 
    public static final String KEY_ADDRESS = "propertyaddress"; 
    public static final String KEY_JOBNO = "jobnumber"; 
    public static final String KEY_ASSIGNED = "assignedto"; 
    public static final String KEY_COMPANY = "company"; 
    public static final String KEY_DATE = "datecreated"; 
    public static final String KEY_MASTERKEY = "usemasterkey"; 
    public static final String KEY_PHONEBEFORE = "phonebefore"; 
    public static final String KEY_PROBLEM = "descriptionofproblem"; 
    private static final String TAG = "DBAdapter"; 

    private static final String DATABASE_NAME = "SABDatabase"; 
    private static final String DATABASE_TABLE = "jobs"; 
    private static final int DATABASE_VERSION = 1; 

    private static final String DATABASE_CREATE = 
     "create table jobs (_id integer primary key autoincrement, " 
     + "propertyid text not null, propertyaddress text not null, " 
     + "jobnumber text not null, assignedto text not null, " 
     + "company text not null, datecreated text not null, " 
     + "usemasterkey text not null, phonebefore text not null, " 
     + "descriptionofproblem text not null);"; 

    private final Context context; 

    private DatabaseHelper DBHelper; 
    private SQLiteDatabase db; 

    public DBAdapter(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); 
     } 

     @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 jobs"); 
      onCreate(db); 
     } 
    } 

    //---opens the database--- 
    public DBAdapter open() throws SQLException 
    { 
     db = DBHelper.getWritableDatabase(); 
     return this; 
    } 

    //---closes the database---  
    public void close() 
    { 
     DBHelper.close(); 
    } 


    //---insert a job into the database--- 
    public long insertJob(String propertyid, String propertyaddress, String jobnumber, 
      String assignedto, String company, String datecreated, String usemasterkey, 
      String phonebefore, String descriptionofproblem) 
    { 
     ContentValues initialValues = new ContentValues(); 
     initialValues.put(KEY_PROPERTYID, propertyid); 
     initialValues.put(KEY_ADDRESS, propertyaddress); 
     initialValues.put(KEY_JOBNO, jobnumber); 
     initialValues.put(KEY_ASSIGNED, assignedto); 
     initialValues.put(KEY_COMPANY, company); 
     initialValues.put(KEY_DATE, datecreated); 
     initialValues.put(KEY_MASTERKEY, usemasterkey); 
     initialValues.put(KEY_PHONEBEFORE, phonebefore); 
     initialValues.put(KEY_PROBLEM, descriptionofproblem); 
     return db.insert(DATABASE_TABLE, null, initialValues); 
    } 

    //---deletes a particular job--- 
    public boolean deleteJob(long rowId) 
    { 
     return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0; 
    } 

    //---retrieves all the jobs--- 
    public Cursor getAllJobs() 
    { 
     return db.query(DATABASE_TABLE, new String[] { 
       KEY_ROWID, 
       KEY_PROPERTYID, 
       KEY_ADDRESS, 
       KEY_JOBNO, 
       KEY_ASSIGNED, 
       KEY_COMPANY, 
       KEY_DATE, 
       KEY_MASTERKEY, 
       KEY_PHONEBEFORE, 
       KEY_PROBLEM}, 
       null, 
       null, 
       null, 
       null, 
       null); 
    } 


    //---retrieves a particular job--- 
    public Cursor getJob(long rowId) throws SQLException 
    { 
     Cursor mCursor = 
       db.query(true, DATABASE_TABLE, new String[] { 
         KEY_ROWID, 
         KEY_PROPERTYID, 
         KEY_ADDRESS, 
         KEY_JOBNO, 
         KEY_ASSIGNED, 
         KEY_COMPANY, 
         KEY_DATE, 
         KEY_MASTERKEY, 
         KEY_PHONEBEFORE, 
         KEY_PROBLEM}, 
         KEY_ROWID + "=" + rowId, 
         null, 
         null, 
         null, 
         null, 
         null); 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 
    } 

    //---updates a job--- 
    public boolean updateJob(long rowId, String propertyid, String propertyaddress, String jobnumber, 
      String assignedto, String company, String datecreated, String usemasterkey, 
      String phonebefore, String descriptionofproblem) 
    { 
     ContentValues args = new ContentValues(); 
     args.put(KEY_PROPERTYID, propertyid); 
     args.put(KEY_ADDRESS, propertyaddress); 
     args.put(KEY_JOBNO, jobnumber); 
     args.put(KEY_ASSIGNED, assignedto); 
     args.put(KEY_COMPANY, company); 
     args.put(KEY_DATE, datecreated); 
     args.put(KEY_MASTERKEY, usemasterkey); 
     args.put(KEY_PHONEBEFORE, phonebefore); 
     args.put(KEY_PROBLEM, descriptionofproblem); 
     return db.update(DATABASE_TABLE, args, 
         KEY_ROWID + "=" + rowId, null) > 0; 
    } 
} 

然后我尝试在我的ViewJobs.java类使用的数据库

​​

吐司输出-1，告诉我已经有在输入数据时出错，但我找不到出错的地方。

如果我只是忽略错误并继续下面的代码，那么我的应用程序崩溃。

db.open(); 
     Cursor c = db.getAllJobs(); 
     db.close(); 

如果有人能提供任何建议，我将不胜感激！

-Harry

下面是当它崩溃的logcat代码：

03-04 18:37:59.760: W/dalvikvm(2078): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 
03-04 18:37:59.809: I/dalvikvm(2078): threadid=3: reacting to signal 3 
03-04 18:37:59.958: E/AndroidRuntime(2078): FATAL EXCEPTION: main 
03-04 18:37:59.958: E/AndroidRuntime(2078): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sab.namespace/com.sab.namespace.ViewJobs}: android.database.sqlite.SQLiteException: no such table: jobs: , while compiling: SELECT _id, propertyid, propertyaddress, jobnumber, assignedto, company, datecreated, usemasterkey, phonebefore, descriptionofproblem FROM jobs 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread.access$600(ActivityThread.java:123) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.os.Looper.loop(Looper.java:137) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at java.lang.reflect.Method.invoke(Method.java:511) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at dalvik.system.NativeStart.main(Native Method) 
03-04 18:37:59.958: E/AndroidRuntime(2078): Caused by: android.database.sqlite.SQLiteException: no such table: jobs: , while compiling: SELECT _id, propertyid, propertyaddress, jobnumber, assignedto, company, datecreated, usemasterkey, phonebefore, descriptionofproblem FROM jobs 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at com.sab.namespace.DBAdapter.getAllJobs(DBAdapter.java:114) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at com.sab.namespace.ViewJobs.onCreate(ViewJobs.java:52) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.Activity.performCreate(Activity.java:4465) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
03-04 18:37:59.958: E/AndroidRuntime(2078):  ... 11 more 
03-04 18:37:59.969: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt' 
03-04 18:38:00.328: I/dalvikvm(2078): threadid=3: reacting to signal 3 
03-04 18:38:00.358: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt' 
03-04 18:38:00.658: I/dalvikvm(2078): threadid=3: reacting to signal 3 
03-04 18:38:00.799: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt' 
03-04 18:38:03.210: I/Process(2078): Sending signal. PID: 2078 SIG: 9 

这里是ViewJobs.java

package com.sab.namespace; 

import android.app.Activity; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.Toast; 

public class ViewJobs extends Activity { 

    String titles[] = {"hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe"}; 
    ListView vListView; 
    ArrayAdapter<String> lVAAdapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.view); 

     //database stuff 
     DBAdapter db = new DBAdapter(this); 
     db.open();   
     long id; 
     id = db.insertJob(
       "PROP121", 
       "MARK ANDREWS DRIVE", 
       "JOB32", 
       "COLIN", 
       "SAB", 
       "12/4/13", 
       "yes", 
       "yes", 
       "SHIT IS EVERYWHERE"); 
     id = db.insertJob(
       "PROP122", 
       "FAULTY CLOSE", 
       "JOB33", 
       "DAVE", 
       "SAB", 
       "13/4/13", 
       "yes", 
       "yes", 
       "FIX PLEASE"); 
     db.close(); 
     Toast.makeText(this, Long.toString(id), Toast.LENGTH_LONG).show(); 

     db.open(); 
     Cursor c = db.getAllJobs(); 
     db.close(); 
     /* 
     if (c.moveToFirst()) 
     { 
      do {   
       DisplayJob(c); 
      } while (c.moveToNext()); 
     } 
     db.close(); 
     */ 

     //create list 
     vListView = (ListView) findViewById(R.id.vlistview); 
     lVAAdapter = new ArrayAdapter<String>(ViewJobs.this, 
       android.R.layout.simple_list_item_1, titles); 

     //create listener 
     vListView.setAdapter(lVAAdapter); 
     vListView.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> lVAAdapter, View myView, 
        int myItemInt, long mylng) { 
        String selectedFromList = (String) (vListView.getItemAtPosition(myItemInt)); 
        if (titles[myItemInt] == "hello") { 
         titles[2] = "test"; 
         vListView.invalidateViews(); 
        } 
      } 
     }); 
    } 

    public void DisplayJob(Cursor c) 
    { 
     Toast.makeText(this, 
       "id: " + c.getString(0) + "\n" + 
       "propertyid: " + c.getString(1) + "\n" + 
       "propertyaddress: " + c.getString(2) + "\n" + 
       "jobnumber: " + c.getString(3) + "\n" + 
       "assignedto: " + c.getString(4) + "\n" + 
       "company: " + c.getString(5) + "\n" + 
       "datecreated: " + c.getString(6) + "\n" + 
       "usemasterkey: " + c.getString(7) + "\n" + 
       "phonebefore: " + c.getString(8) + "\n" + 
       "descriptionofproblem: " + c.getString(9), 
       Toast.LENGTH_LONG).show();   
    } 
} 

Answer 1

完整的代码你可能之后添加的作业表创建数据库。 onCreate不会被调用。所以你需要清除onCreate的数据再次被调用。