SQLite android不會創建所有表
[英]SQLite android doesnt create all tables
問題描述
我正在基於SQLite數據庫在Android中構建應用程序。
不幸的是，它似乎不能很好地工作，因為它只能從大約50個文件中導入一個帶有sql語句的文件。
結構為：
- 我有一個包含多個元素的ListView
- 從ListView中選擇一個項目后，啟動一個新的Activity（ShowPoints.java），並在帶有Bundle Object的Activity之間傳遞一個額外的元素，即int值。
- 新活動（ShowPoints）由一種表單組成，用戶可以在其中寫一些東西並可以搜索數據庫表。
- 在ShowPoints中，我編寫了一個基於int值的開關，將另一個int元素的值設置為我的raw文件夾中的Raw資源之一，其中填充了一些不帶擴展名的包含SQL語句的文件。 在每個文件中都有一個“ CREATE TABLE ....;”。 一千行，例如“ INSERT INTO .... VALUES ....;”
- 在ShowPoints中，我創建一個新對象MyDatabase，該對象傳遞資源int（R.raw.blahblah），該資源創建一個新的DbHelper對象，在其中創建數據庫，並從文件中讀取，然后逐行執行SQL讀取。
它僅適用於一個文件u_4x100，並且應用程序崩潰時提示沒有數據庫。
這是代碼：
ShowPoints.java
package it.gorlux.onyourmark;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class ShowPoints extends Activity {
EditText searchText;
Cursor cursor;
ListAdapter adapter;
MyDatabase db;
ListView peopleLv;
DbHelper mDbHelper;
SQLiteDatabase _db;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_points);
Bundle b = getIntent().getExtras();
int item_int = b.getInt("item");
peopleLv=(ListView)findViewById(R.id.peopleLv);
searchText = (EditText)findViewById(R.id.searchText);
Context ctx = this;
db=new MyDatabase(getApplicationContext(),item_int,this);
}
public void search(View view) {
db.open(); //apriamo il db
// || is the concatenation operation in SQLite
adapter = new SimpleCursorAdapter(
this,
R.layout.person,
db.searchLabel(searchText.getText().toString()),
new String[]{MyDatabase.PersonMetaData.PERSON_NAME_KEY,MyDatabase.PersonMetaData.PERSON_AGE_KEY},//queste colonne
new int[]{R.id.nameTv,R.id.ageTv});
peopleLv.setAdapter(adapter);
}
}
MyDatabase.java
package it.gorlux.onyourmark;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class MyDatabase {
SQLiteDatabase mDb;
Context mContext;
DbHelper mDbHelper;
public int res;
public String tabella = null;
private static final String DB_NAME="punteggi";//nome del database<!--more-->
private static final int DB_VERSION=1; //numero di versione del nostro database
Context ctx2;
public MyDatabase(Context ctx, int item, Context ctx2) {
mContext=ctx;
this.ctx2 = ctx2;
int item2 = item;
switch(item) {
case 0: {res=R.raw.d_4x100;break;}case 1: {res=R.raw.d_4x200;break;}case 2: {res=R.raw.d_4x400;break;}case 3: {res=R.raw.d_4x800;break;}case 4: {res=R.raw.d_4x1500;break;}case 5: {res=R.raw.d_100h;break;}case 6: {res=R.raw.d_100m;break;}case 7: {res=R.raw.d_200h;break;}case 8: {res=R.raw.d_200m;break;}case 9: {res=R.raw.d_400h;break;}case 10: {res=R.raw.d_400m;break;}case 11: {res=R.raw.d_800m;break;}case 12: {res=R.raw.d_1500m;break;}case 13: {res=R.raw.d_3000m;break;}case 14: {res=R.raw.d_3000siepi;break;}case 15: {res=R.raw.d_5000m;break;}case 16: {res=R.raw.d_10000m;break;}case 17: {res=R.raw.d_alto;break;}case 18: {res=R.raw.d_asta;break;}case 19: {res=R.raw.d_disco;break;}case 20: {res=R.raw.d_giavellotto;break;}case 21: {res=R.raw.d_lungo;break;}case 22: {res=R.raw.d_marcia5km;break;}case 23: {res=R.raw.d_martello;break;}case 24: {res=R.raw.d_peso;break;}case 25: {res=R.raw.d_svedese;break;}case 26: {res=R.raw.d_triplo;break;}case 27: {res=R.raw.u_4x100;break;}case 28: {res=R.raw.u_4x200;break;}case 29: {res=R.raw.u_4x400;break;}case 30: {res=R.raw.u_4x800;break;}case 31: {res=R.raw.u_4x1500;break;}case 32: {res=R.raw.u_100m;break;}case 33: {res=R.raw.u_110h;break;}case 34: {res=R.raw.u_200h;break;}case 35: {res=R.raw.u_200m;break;}case 36: {res=R.raw.u_400h;break;}case 37: {res=R.raw.u_400m;break;}case 38: {res=R.raw.u_800m;break;}case 39: {res=R.raw.u_1500m;break;}case 40: {res=R.raw.u_3000m;break;}case 41: {res=R.raw.u_3000siepi;break;}case 42: {res=R.raw.u_5000m;break;}case 43: {res=R.raw.u_10000m;break;}case 44: {res=R.raw.u_alto;break;}case 45: {res=R.raw.u_asta;break;}case 46: {res=R.raw.u_disco;break;}case 47: {res=R.raw.u_giavellotto;break;}case 48: {res=R.raw.u_lungo;break;}case 49: {res=R.raw.u_marcia10km;break;}case 50: {res=R.raw.u_martello;break;}case 51: {res=R.raw.u_peso;break;}case 52: {res=R.raw.u_svedese;break;}case 53: {res=R.raw.u_triplo;break;}
default : {break;}
}
switch(item2) {
case 0:{tabella="d_4x100";break;}case 1:{tabella="d_4x200";break;}case 2:{tabella="d_4x400";break;}case 3:{tabella="d_4x800";break;}case 4:{tabella="d_4x1500";break;}case 5:{tabella="d_100h";break;}case 6:{tabella="d_100m";break;}case 7:{tabella="d_200h";break;}case 8:{tabella="d_200m";break;}case 9:{tabella="d_400h";break;}case 10:{tabella="d_400m";break;}case 11:{tabella="d_800m";break;}case 12:{tabella="d_1500m";break;}case 13:{tabella="d_3000m";break;}case 14:{tabella="d_3000siepi";break;}case 15:{tabella="d_5000m";break;}case 16:{tabella="d_10000m";break;}case 17:{tabella="d_alto";break;}case 18:{tabella="d_asta";break;}case 19:{tabella="d_disco";break;}case 20:{tabella="d_giavellotto";break;}case 21:{tabella="d_lungo";break;}case 22:{tabella="d_marcia5km";break;}case 23:{tabella="d_martello";break;}case 24:{tabella="d_peso";break;}case 25:{tabella="d_svedese";break;}case 26:{tabella="d_triplo";break;}case 27:{tabella="u_4x100";break;}case 28:{tabella="u_4x200";break;}case 29:{tabella="u_4x400";break;}case 30:{tabella="u_4x800";break;}case 31:{tabella="u_4x1500";break;}case 32:{tabella="u_100m";break;}case 33:{tabella="u_110h";break;}case 34:{tabella="u_200h";break;}case 35:{tabella="u_200m";break;}case 36:{tabella="u_400h";break;}case 37:{tabella="u_400m";break;}case 38:{tabella="u_800m";break;}case 39:{tabella="u_1500m";break;}case 40:{tabella="u_3000m";break;}case 41:{tabella="u_3000siepi";break;}case 42:{tabella="u_5000m";break;}case 43:{tabella="u_10000m";break;}case 44:{tabella="u_alto";break;}case 45:{tabella="u_asta";break;}case 46:{tabella="u_disco";break;}case 47:{tabella="u_giavellotto";break;}case 48:{tabella="u_lungo";break;}case 49:{tabella="u_marcia10km";break;}case 50:{tabella="u_martello";break;}case 51:{tabella="u_peso";break;}case 52:{tabella="u_svedese";break;}case 53:{tabella="u_triplo";break;}
default:{break;}
}
mDbHelper=new DbHelper(ctx2, DB_NAME, null, DB_VERSION, res);
}
public void open() { //apriamo il database, rendendolo scrivibile e leggibile
mDb=mDbHelper.getWritableDatabase();
}
public void close() { //chiudiamo il database
mDb.close();
}
// Vediamo ora come aggiungere tabelle e campi alle tabelle del db
/* public void insertPerson(String name,String punt) { //metodo per inserire i dati
ContentValues cv=new ContentValues();
cv.put(PersonMetaData.PERSON_NAME_KEY, name);
cv.put(PersonMetaData.PERSON_AGE_KEY, punt);
mDb.insert(PersonMetaData.PERSON_TABLE, null, cv);
}*/
/* public Cursor fetchProducts() { //metodo per fare la query di tutti i dati
return mDb.query(PersonMetaData.PERSON_TABLE, null,null,null,null,null,null);
}*/
public Cursor searchLabel(String s) {
return mDb.rawQuery("SELECT _id, prestazione, punteggio FROM " + tabella + " WHERE prestazione || ' ' || punteggio LIKE ?",
new String[]{"%" + s + "%"});
}
static class PersonMetaData { // i metadati della tabella, accessibili ovunque
/* static final String PERSON_TABLE = tabella;
*/ static final String ID = "_id";
static final String PERSON_NAME_KEY = "prestazione";
static final String PERSON_AGE_KEY = "punteggio";
}
/*public static final String PERSON_TABLE_CREATE = "CREATE TABLE IF NOT EXISTS " //codice sql di creazione della tabella
+ tabella + " ("
+ PersonMetaData.ID+ " integer primary key autoincrement, "
+ PersonMetaData.PERSON_NAME_KEY + " text not null, "
+ PersonMetaData.PERSON_AGE_KEY + " text not null"
+ "');";
*/
}
DbHelper.java
package it.gorlux.onyourmark;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DbHelper extends SQLiteOpenHelper { //classe che ci aiuta nella creazione del db
int item;
Context ctx;
public DbHelper(Context context, String name, CursorFactory factory,int version, int item) {
super(context, name, factory, version);
this.item = item;
this.ctx = context;
}
@Override
public void onCreate(SQLiteDatabase _db) { //solo quando il db viene creato, creiamo la tabella
InputStream inputStream = ctx.getResources().openRawResource( item );
InputStreamReader inputreader = new InputStreamReader(inputStream);
BufferedReader buffreader = new BufferedReader(inputreader);
String line;
try {
while (( line = buffreader.readLine()) != null) {
//System.out.println(line);
_db.execSQL(line);
}
} catch (IOException e) {
}
/* _db.execSQL(MyDatabase.PERSON_TABLE_CREATE);
String[] queries = MyDatabase.exec.split(";");
for(String query : queries){
_db.execSQL(query);
}
String[] queries2 = MyDatabase.exec2.split(";");
for(String query : queries2){
_db.execSQL(query);
}*/
}
public void execute(SQLiteDatabase _db, String s) {
_db.execSQL(s);
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
//qui mettiamo eventuali modifiche al db, se nella nostra nuova versione della app, il db cambia numero di versione
}
}
u_4x100（工作文件）
CREATE TABLE IF NOT EXISTS u_4x100 (_id integer primary key autoincrement, prestazione text, punteggio text);
INSERT INTO u_4x100 (_id, prestazione, punteggio) VALUES (1, '37.40', '1300');
INSERT INTO u_4x100 (_id, prestazione, punteggio) VALUES (2, '38.10', '1207');
INSERT INTO u_4x100 (_id, prestazione, punteggio) VALUES (3, '38.80', '1129');
INSERT INTO u_4x100 (_id, prestazione, punteggio) VALUES (4, '39.59', '1059');
.....
u_4x200（其中一個無效文件）
CREATE TABLE IF NOT EXISTS u_4x200 (_id integer primary key autoincrement, prestazione text, punteggio text);
INSERT INTO u_4x200 (_id, prestazione, punteggio) VALUES (1, '1:18.68', '1300');
INSERT INTO u_4x200 (_id, prestazione, punteggio) VALUES (2, '1:19.53', '1230');
INSERT INTO u_4x200 (_id, prestazione, punteggio) VALUES (3, '1:20.51', '1160');
INSERT INTO u_4x200 (_id, prestazione, punteggio) VALUES (4, '1:21.72', '1090');
INSERT INTO u_4x200 (_id, prestazione, punteggio) VALUES (5, '1:23.41', '1020');
.....
謝謝你的支持：）
1 個解決方案
解決方案1
0 已采納 2013-07-06 13:53:01
試試這個可能對您有幫助：
我認為您應該將此_db.execSQL（line）和_db.execSQL（s）代碼放入try catch塊中；
在DbHelper.java中
更改
while (( line = buffreader.readLine()) != null) {
//System.out.println(line);
_db.execSQL(line);
}
至
while (( line = buffreader.readLine()) != null) {
//System.out.println(line);
try
{
_db.execSQL(line);
}
catch(Exception e)
{}
}
和
_db.execSQL(s);
至
try{ _db.execSQL(s);}
catch(Exception e){}
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