Question

每当我尝试执行第二个表DATABASE_TABLE1时，它都没有显示这样的表错误

当我在第一个表中插入但它显示在第二个表中时，它没有显示错误

package com.example.billpay;

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.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class Process {

public static final String KEY_FNAME="person_fname";
public static final String KEY_LNAME="person_lname";
public static final String KEY_EMAIL="person_email";
public static final String KEY_PHNO="person_pno";
public static final String KEY_UNAME="person_uname";
public static final String KEY_PASS="person_pass";
public static final String KEY_EID="person_electricityid";

public static final String KEY_EBID="person_eid";
public static final String KEY_EMONTH="bill_month";
public static final String KEY_EBREAD="bill_reading";
public static final String KEY_EBAMOUNT="bill_amount";



private static final String DATABASE_NAME="bill";
private static final String DATABASE_TABLE="electric";
private static final String DATABASE_TABLE1="electricbill";
private static final int DATABASE_VERSION=1;

private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;

private static class DbHelper extends SQLiteOpenHelper{

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
        KEY_UNAME + " TEXT PRIMARY KEY, " +
                KEY_FNAME + " TEXT NOT NULL, " +
                KEY_LNAME + " TEXT NOT NULL, " +
                KEY_EMAIL + " TEXT NOT NULL, " +
                KEY_PHNO + " INTEGER NOT NULL, " +
                KEY_PASS + " TEXT NOT NULL, " +
                KEY_EID + " TEXT NOT NULL, " +
                " FOREIGN KEY ("+KEY_EID+") REFERENCES "+DATABASE_TABLE1+" ("+KEY_EBID+"));"
                );

//creation of second table

        db.execSQL("CREATE TABLE " + DATABASE_TABLE1 + " (" +
        KEY_EBID + " TEXT PRIMARY KEY, " +
                KEY_EMONTH + " TEXT NOT NULL, " +
                KEY_EBREAD + " TEXT NOT NULL, " +
                KEY_EBAMOUNT + " TEXT NOT NULL); "
                );



    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE1);
        onCreate(db);
    }

}

public Process(Context c){
    ourContext=c;

}

public Process open() throws SQLException{
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;

}

public void close(){
    ourHelper.close();

}

public long createEntry(String pfname, String plname, String pemail,
        String puname, String ppass, String pphno, String peid ) {
    // TODO Auto-generated method stub

    ContentValues cv = new ContentValues();
    cv.put(KEY_FNAME, pfname);
    cv.put(KEY_LNAME, plname);
    cv.put(KEY_EMAIL, pemail);
    cv.put(KEY_UNAME, puname);
    cv.put(KEY_PASS, ppass);
    cv.put(KEY_PHNO, pphno);
    cv.put(KEY_EID, peid);

    return ourDatabase.insert(DATABASE_TABLE, null, cv);    
}


public String getData() {
    // TODO Auto-generated method stub
    String[] columns = new String[]{ KEY_FNAME, KEY_LNAME, KEY_EMAIL, KEY_UNAME, KEY_PASS, KEY_PHNO, KEY_EID };
    Cursor c=ourDatabase.query(DATABASE_TABLE, columns, null , null , null , null , null);
    String result = "";

    int gfname=c.getColumnIndex(KEY_FNAME);
    int glname=c.getColumnIndex(KEY_LNAME);
    int gemail=c.getColumnIndex(KEY_EMAIL);
    int guname=c.getColumnIndex(KEY_UNAME);
    int gpass=c.getColumnIndex(KEY_PASS);
    int gphno=c.getColumnIndex(KEY_PHNO);
    int geid=c.getColumnIndex(KEY_EID);

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
        result= result + c.getString(gfname) + " "  + c.getString(glname) + " " + c.getString(gemail) + " "
                + c.getString(guname) + " " + c.getString(gpass) + " "  + c.getString(gphno)  + c.getString(geid) +  "\n";

    }

    return result;

}

public String getpass(String k) {
    // TODO Auto-generated method stub
    String[] columns = new String[]{ KEY_FNAME, KEY_LNAME, KEY_EMAIL, KEY_UNAME, KEY_PASS, KEY_PHNO};
    Cursor c=ourDatabase.query(DATABASE_TABLE, columns, KEY_UNAME + "='" + k + "'", null, null, null, null);
    if (c != null){
        c.moveToFirst();
        String rpassword = c.getString(4);
        return rpassword;
    }

    return null;
}


//second DATABASE function
public long createeentry(String peid, String pemonth, String peamount,
        String pereading) {
    // TODO Auto-generated method stub
    ContentValues ph = new ContentValues();
    ph.put( KEY_EBID, peid);
    ph.put( KEY_EMONTH, pemonth);
    ph.put( KEY_EBREAD, pereading);
    ph.put( KEY_EBAMOUNT, peamount);

    return ourDatabase.insert(DATABASE_TABLE1, null, ph);
}

public String getedata() {
    // TODO Auto-generated method stub
    String col[]= new String[] { KEY_EBID, KEY_EMONTH, KEY_EBREAD, KEY_EBAMOUNT };
    Cursor l= ourDatabase.query(DATABASE_TABLE1, col, null, null, null, null, null);
    String eresult="";
    int peid=l.getColumnIndex(KEY_EBID);
    int pemonth=l.getColumnIndex(KEY_EMONTH);
    int peread=l.getColumnIndex(KEY_EBREAD);
    int pamount=l.getColumnIndex(KEY_EBAMOUNT);

    for (l.moveToFirst(); !l.isAfterLast(); l.moveToNext()){
        eresult= eresult + l.getString(peid) + " "  + l.getString(pemonth) + " " + l.getString(peread) + " "
                + l.getString(pamount) +  "\n";

    }
    return eresult;
}}

我也在使用外键atrribute.Hope我正在使用它coreect 这是即将出现的错误

04-24 14:31:37.864: E/SQLiteLog(16297): (1) no such table: electricbill
04-24 14:32:09.080: D/AndroidRuntime(16438): Shutting down VM
04-24 14:32:09.081: W/dalvikvm(16438): threadid=1: thread exiting with uncaught     exception (group=0x40e06908)

Answer 1

再次尝试运行，这次是在增加数据库版本之后。您可能只是在第一个表中测试了这个，触发了创建。但是，成功启动不会尝试调用onUpgrade（除非数据库版本已更改，否则将在删除表后调用onCreate）。

另一种方法是从模拟器/手机卸载以前的版本，然后重新安装。

Answer 2

更改数据库版本或卸载您的应用，然后重新安装它肯定会有效

我在sqlite中创建2个表时没有这样的表错误

2 个答案: