您好我想在数据库中创建两个不同的表。这些表是 User_details 和 Creditcard_details 我创建了以下DBAdapter类来实现数据库操作，但是当我调用 insertCreditcard（）方法 时，不会插入值。我想知道第二张表是否正在创建。我在某个地方出错，但无法弄清楚我应该在哪里以及应该做些什么来纠正这个问题。
我正在尝试做的是，根据登录活动中提供的用户名和密码，检查 User_details 表中的 id字段，然后分配值此 id变量指另一个名为 ccid 的变量，该变量用于搜索 Creditcard_details 表格中的行或向其中插入值。
有人可以指导我。
package com.androidbook.LoginForm;
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;
import android.widget.Toast;
public class DBAdapter {
/*------------------------User Details ---------------------------------*/
public static Cursor d;
public static final String KEY_ROWID = "_id";
public static final String KEY_Name = "name";
public static final String KEY_Username = "username";
public static final String KEY_Password = "password";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "Wallet";
private static final String DATABASE_TABLE = "User_Details";
/*------------------------Credit Cards Table----------------------*/
private static final String KEY_CCID = "_ccid";
private static final String KEY_CCUNAME= "cuname";
private static final String KEY_CCNO = "ccno";
private static final String KEY_CVV = "cvvno";
private static final String EXP_DATE = "expdate";
private static final String CREDITCARDS_TABLE = "Creditcard_Details";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"create table User_Details (_id integer primary key autoincrement, "
+ "name text not null, username text not null, "
+ "password text not null);";
/*---------------------Create Credit Card Table -------------------------------*/
private static final String CCTABLE_CREATE =
"create table Creditcard_Details ( _ccid integer primary key , "
+ "cuname text not null, ccno text not null, "
+ "cvvno text not null" + "expdate text not null )";//+ "FOREIGN KEY(_ccid) REFERENCES User_Details(_id))";
private final Context context;
public 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);
db.execSQL(CCTABLE_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 titles");
onCreate(db);
}
}
public int Login(String username,String password)
{
try
{
Cursor c = null;
c = db.rawQuery("select * from User_Details where username =" + "\""+ username + "\""+" and password="+ "\""+ password + "\"", null);
c.moveToFirst();
String tempid = c.getString(0);
//Toast.makeText(DBAdapter.this, "correct"+" "+c,Toast.LENGTH_LONG).show();
d= c;//CCview(tempid);
return c.getCount();
}
catch(Exception e)
{
e.printStackTrace();
}
return 0;
}
//-----------------------Display Credit Card -----------------------------
/* public int Getid(String tempid)
{ Cursor c;
c = db.rawQuery("select id from User_Details where username ="
+ "\""+ username + "\"", null);
return Integer.parseInt(c.getString(0));
}*/
public Cursor cursordisplay()
{ return d;
}
public Cursor CCview(long menuid)throws SQLException
{
Cursor mCursor =
db.query(true, CREDITCARDS_TABLE, new String[] {
KEY_CCID,
KEY_CCUNAME,
KEY_CCNO,
KEY_CVV,
EXP_DATE,
},
KEY_CCID + "=" + menuid,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//--------------------Entries into Credit Card Table------------------------------------
//---insert a title into the database---
public long insertCreditcard(int i, String j, String k, String l, String date)
{
ContentValues creditValues = new ContentValues();
creditValues.put(KEY_CCID, i);
creditValues.put(KEY_CCUNAME, j);
creditValues.put(KEY_CCNO, k);
creditValues.put(KEY_CVV, l);
creditValues.put(EXP_DATE, date);
return db.insert(CREDITCARDS_TABLE, null, creditValues);
}
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a title into the database---
public long insertTitle(String name, String username, String password)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_Name, name);
initialValues.put(KEY_Username, username);
initialValues.put(KEY_Password, password);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//---deletes a particular title---
public boolean deleteTitle(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
//---retrieves all the titles---
public Cursor getAllTitles()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_Name,
KEY_Username,
KEY_Password},
null,
null,
null,
null,
null);
}
//---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_Name,
KEY_Username,
KEY_Password
},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//---updates a title---
public boolean updateTitle(long rowId, String name,
String username, String password)
{
ContentValues args = new ContentValues();
args.put(KEY_Name, name);
args.put(KEY_Username, username);
args.put(KEY_Password, password);
return db.update(DATABASE_TABLE, args,
KEY_ROWID + "=" + rowId, null) > 0;
}
}
答案 0 :(得分：0)
由于我的评价很低，我无法发表评论，我肯定会在评论中回答你的问题：
.getWritableDatabase（）; 函数为您提供了 - 如名称所示 - 可写数据库。 现在可以使用数据库的所有表格部分
例如：
public Cursor getStuff(String string) {
return db.query(true, TABLE_1, new String[] { KEY_COLUMN1, KEY_COLUMN1,
KEY_COLUMN1 }, KEY_ID + " = ?", new String[] { string },
null, null, null, null);
}
用大写字母书写的所有东西都是我班上定义的字符串常量 - 因为我很懒。如果要查询其他表，只需将TABLE_1替换为您想要的表
答案 1 :(得分：0)
我想B的创建语句中,之后cvvno text not null丢失了{/ 1}}：
CCTABLE_CREATE这应该是：
private static final String CCTABLE_CREATE =
"create table Creditcard_Details ( _ccid integer primary key , "
+ "cuname text not null, ccno text not null, "
+ "cvvno text not null" + "expdate text not null )";//+ "FOREIGN KEY(_ccid) REFERENCES User_Details(_id))";
尝试这样做。如果这不起作用，我会进一步挖掘。