我正在尝试使用包含多列的sqlite创建登录页面，但无法在其中插入值： 这是我的插入查询代码：
package com.example.doctorsmanager;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class DataBaseAdapter
{
static final String DATABASE_NAME = "doctordb";
static final int DATABASE_VERSION = 2;
static final String USERNAME_COLUMN = "UserName";
static final String PASSWORD_COLUMN = "Password";
static final String QUALIFICATION_COLUMN = "Qualification";
static final String SPECIALIZATION_COLUMN = "Specialization";
static final String COLUMN_ID = "id";
static final String REGISTRATIONNUMBER_COLUMN = "RegistrationNumber";
static final String CELLNUMBER_COLUMN = "CellNumber";
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
static final String DATABASE_CREATE = "create table "+"LOGIN"+
"( " +"ID"+" integer primary key autoincrement,"+ "USERNAME text,PASSWORD String,QUALIFICATION String,SPECIALIZATION text,REGISTRATIONNUMBER String,CELLNUMBER integer,MAIL String); ";
// public void onCreate(SQLiteDatabase db){
// String makeTable = "CREATE TABLE " + TABLE_FOOD + "("
// + NAME_COLUMN + " TEXT," + CALORIE_COLUMN + " INTEGER,"
// + PROTEIN_COLUMN + " INTEGER" + ")";
// Variable to hold the database instance
public SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private DataBaseHelper dbHelper;
public DataBaseAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public DataBaseAdapter open() throws SQLException
{
db = dbHelper.getWritableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
public void insertEntry(String userName,String password,String qualification,String specialization,String registrationNumber,String cellNumber,String mailId )
{
ContentValues newValues = new ContentValues();
// Assign values for each row.
newValues.put("USERNAME", userName);
newValues.put("PASSWORD",password);
newValues.put("QUALIFICATION",qualification);
newValues.put("SPECIALIZATION",specialization);
newValues.put("REGISTRATIONNUMBER",registrationNumber);
newValues.put("CONTACTNUMBER",cellNumber);
newValues.put("EMAIL",mailId);
// Insert the row into your table
db.insert("LOGIN", null, newValues);
System.out.println("USERNAME");
System.out.println("PASSWORD");
// Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
}
public int deleteEntry(String UserName)
{
//String id=String.valueOf(ID);
String where="USERNAME=?";
int numberOFEntriesDeleted= db.delete("LOGIN", where, new String[]{UserName}) ;
// Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
return numberOFEntriesDeleted;
}
public String getSinlgeEntry(String userName)
{
Cursor cursor=db.query("LOGIN", null, " USERNAME=?", new String[]{userName}, null, null, null);
if(cursor.getCount()<1) // UserName Not Exist
{
cursor.close();
return "NOT EXIST";
}
cursor.moveToFirst();
String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
cursor.close();
return password;
}
public void updateEntry(String userName,String password,String qualification,String specialization,String registrationNumber,String cellNumber,String mailId)
{
// Define the updated row content.
ContentValues updatedValues = new ContentValues();
// Assign values for each row.
updatedValues.put("USERNAME", userName);
updatedValues.put("PASSWORD",password);
updatedValues.put("QUALIFICATION",qualification);
updatedValues.put("SPECIALIZATION",specialization);
updatedValues.put("REGISTRATIONNUMBER",registrationNumber);
updatedValues.put("CONTACTNUMBER",cellNumber);
updatedValues.put("EMAIL",mailId);
String where="USERNAME = ?";
db.update("LOGIN",updatedValues, where, new String[]{userName});
}
}
当用户按下button创建帐户时，这是注册页面上的代码：
btnCreateAccount.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String userName=editTextUserName.getText().toString();
String password=editTextPassword.getText().toString();
String qualification=editTextQualification.getText().toString();
String specializaion=editTextSpecialization.getText().toString();
String registrationNumber=editTextRegistrationNumber.getText().toString();
String cellNumber=editTextCellNumber.getText().toString();
String mailId=editTextMail.getText().toString();
// check if any of the fields are vaccant
if(userName.equals("")||password.equals(""))
{
Toast.makeText(getApplicationContext(), "Field Vaccant", Toast.LENGTH_LONG).show();
return;
}
// check if both password matches
if(!password.equals(password))
{
Toast.makeText(getApplicationContext(), "Password does not match", Toast.LENGTH_LONG).show();
return;
}
else
{
// Save the Data in Database
DataBaseAdapter.insertEntry(userName,password,qualification,specializaion,registrationNumber,cellNumber,mailId);
Toast.makeText(getApplicationContext(), "Account Successfully Created ", Toast.LENGTH_LONG).show();
以下是成功登录的主登录页面的查询：
btnLogIn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// get The User name and Password
String userName=editTextUserName.getText().toString();
String password=editTextPassword.getText().toString();
// fetch the Password form database for respective user name
String storedPassword=DataBaseAdapter.getSinlgeEntry(userName);
// check if the Stored password matches with Password entered by user
if(password.equals(storedPassword))
{
Toast.makeText(MainActivity.this, "Congrats: Login Successfull", Toast.LENGTH_LONG).show();
// dialog.dismiss();
}`enter code here`
else
{
Toast.makeText(MainActivity.this, "User Name or Password does not match", Toast.LENGTH_LONG).show();
}
// Intent intentlogin=new Intent(getApplicationContext(),LoginSuccess.class);
// startActivity(intentlogin);
}
});
这是我的数据库助手类：
package com.example.doctorsmanager;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DataBaseHelper extends SQLiteOpenHelper
{
public DataBaseHelper(Context context, String name,CursorFactory factory, int version)
{
super(context, name, factory, version);
}
// Called when no database exists in disk and the helper class needs
// to create a new one.
@Override
public void onCreate(SQLiteDatabase _db)
{
_db.execSQL(DataBaseAdapter.DATABASE_CREATE);
}
// Called when there is a database version mismatch meaning that the version
// of the database on disk needs to be upgraded to the current version.
@Override
public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
{
// Log the version upgrade.
Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data");
// Upgrade the existing database to conform to the new version. Multiple
// previous versions can be handled by comparing _oldVersion and _newVersion
// values.
// The simplest case is to drop the old table and create a new one.
_db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
// Create a new one.
onCreate(_db);
}
}
这是log cat：
02-28 02:37:47.838: W/TaskDBAdapter(14302): Upgrading from version 1 to 2, which will destroy all old data
02-28 02:37:47.848: E/SQLiteLog(14302): (1) table LOGIN already exists
02-28 02:37:47.908: D/AndroidRuntime(14302): Shutting down VM
02-28 02:37:47.908: W/dalvikvm(14302): threadid=1: thread exiting with uncaught exception (group=0xb4ab8ba8)
02-28 02:37:48.048: E/AndroidRuntime(14302): FATAL EXCEPTION: main
02-28 02:37:48.048: E/AndroidRuntime(14302): Process: com.example.doctorsmanager, PID: 14302
02-28 02:37:48.048: E/AndroidRuntime(14302): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.doctorsmanager/com.example.doctorsmanager.MainActivity}: android.database.sqlite.SQLiteException: table LOGIN already exists (code 1): , while compiling: create table LOGIN( ID integer primary key autoincrement,USERNAME text,PASSWORD String,QUALIFICATION String,SPECIALIZATION text,REGISTRATIONNUMBER String,CELLNUMBER integer,MAIL String);
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread.access$800(ActivityThread.java:135)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.os.Handler.dispatchMessage(Handler.java:102)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.os.Looper.loop(Looper.java:136)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread.main(ActivityThread.java:5017)
02-28 02:37:48.048: E/AndroidRuntime(14302): at java.lang.reflect.Method.invokeNative(Native Method)
02-28 02:37:48.048: E/AndroidRuntime(14302): at java.lang.reflect.Method.invoke(Method.java:515)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-28 02:37:48.048: E/AndroidRuntime(14302): at dalvik.system.NativeStart.main(Native Method)
02-28 02:37:48.048: E/AndroidRuntime(14302): Caused by: android.database.sqlite.SQLiteException: table LOGIN already exists (code 1): , while compiling: create table LOGIN( ID integer primary key autoincrement,USERNAME text,PASSWORD String,QUALIFICATION String,SPECIALIZATION text,REGISTRATIONNUMBER String,CELLNUMBER integer,MAIL String);
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.example.doctorsmanager.DataBaseHelper.onCreate(DataBaseHelper.java:20)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.example.doctorsmanager.DataBaseHelper.onUpgrade(DataBaseHelper.java:37)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.example.doctorsmanager.DataBaseAdapter.open(DataBaseAdapter.java:42)
02-28 02:37:48.048: E/AndroidRuntime(14302): at com.example.doctorsmanager.MainActivity.onCreate(MainActivity.java:29)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.Activity.performCreate(Activity.java:5231)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
02-28 02:37:48.048: E/AndroidRuntime(14302): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
02-28 02:37:48.048: E/AndroidRuntime(14302): ... 11 more
答案 0 :(得分：1)
您正在多次创建数据库。将数据库创建移动到SQLiteOpenHelper类，只需在要使用它的活动中创建它的实例。
答案 1 :(得分：0)
在此你犯了错误，你已经改变了表列，以便你已经将数据库版本改为1到2.你要做的事情就是在SQLiteOpenHelper类文件中使用下面给出的代码那样
public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
{
Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data");
_db.execSQL("ALTER TABLE login ADD COLUMN EMAIL varchar(16)");
onCreate(_db);
}
在Alter Table Query中，Email是新添加的列，使用sqlite manager来创建数据库View
答案 2 :(得分：0)
// MainActivity.java
public class MainActivity extends ActionBarActivity {
Button btlogin,btacc;
EditText emailid,passwd;
SQLiteDatabase db=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btlogin=(Button)findViewById(R.id.button1);
btacc=(Button)findViewById(R.id.button2);
emailid=(EditText)findViewById(R.id.editText1);
passwd=(EditText)findViewById(R.id.editText2);
db=openOrCreateDatabase("mydb", MODE_PRIVATE, null);
btacc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent in=new Intent(MainActivity.this,Signin.class);
startActivity(in);
}
});
btlogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String mail_id=emailid.getText().toString();
String password=passwd.getText().toString();
if(mail_id==null||mail_id==""||mail_id.length()<10)
{
show("Please Enter Correct mail id.");
}
else if(password==null||password==""||password.length()<6)
{
show("Please Enter Correct Password.");
}
else
{
Cursor c=db.rawQuery("select * from login where email_id='"+mail_id+"' and password='"+password+"'",null);
c.moveToFirst();
if(c.getCount()>0)
{
Intent i=new Intent(MainActivity.this,Show.class);
i.putExtra("name",mail_id );
startActivityForResult(i,500);
db.close();
finish();
}
else
show("Wrong Password or Email Id.");
}
}
private void show(String string) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), string, Toast.LENGTH_LONG).show();
}
});
}
}
// Signin.java类
public class Signin extends Activity {
EditText ename,eemail,emobile,enewpwd,erepwd;
Button bok;
SQLiteDatabase db=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.signin);
ename=(EditText)findViewById(R.id.editText1);
eemail=(EditText)findViewById(R.id.editText2);
emobile=(EditText)findViewById(R.id.editText3);
enewpwd=(EditText)findViewById(R.id.editText4);
erepwd=(EditText)findViewById(R.id.editText5);
bok=(Button)findViewById(R.id.button1);
db=openOrCreateDatabase("mydb", MODE_PRIVATE, null);
db.execSQL("create table if not exists login(name varchar,email_id varchar,mobile_no varchar,password varchar,repassword varchar)");
bok.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String name=ename.getText().toString();
String email_id=eemail.getText().toString();
String mobile_no=emobile.getText().toString();
String password=enewpwd.getText().toString();
String repassword=erepwd.getText().toString();
if(name==null||name==""||name.length()<3)
{
show("Please Enter Correct Name.");
}
else if(mobile_no==null||mobile_no==""||mobile_no.length()<10)
{
show("Please Enter Correct mobile number.");
}
else if(email_id==null||email_id==""||email_id.length()<10)
{
show("Please Enter Correct Email id.");
}
else if(password==null||password==""||password.length()<6)
{
show("Please Enter Strong Password.");
}
else if(repassword==null||repassword=="")
{
show("password mismatch.");
}
else
{
db.execSQL("insert into login values('"+name+"','"+email_id+"','"+mobile_no+"','"+password+"','"+repassword+"')");
Intent in=new Intent(Signin.this,Show.class);
in.putExtra("name", email_id);
startActivity(in);
db.close();
finish();
}
}
private void show(String str) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show();
}
});
}
} //show.java类
public class Show extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.show);
Intent intent = getIntent();
String n = intent.getStringExtra("name");
TextView t=(TextView)findViewById(R.id.textView2);
String nn;
String[] separated = n.split("@");
nn=separated[0];
//separated[1];
t.setText(nn);
}
}