DatabaseHandler.Java
private static final int DATABASE_Version=4;
private static final String DATABASE_Name="UserManager";
private static final String TABLE_USERS="Users";
private SQLiteDatabase db;
private static final String USER_NAME ="Name";
private static final String USER_PASSWRD ="Passwrod";
private static final String USER_REPASSWRD ="ReEnterPassword";
private static final String USER_EMAIL ="Email";
private static final String USER_AGE ="Age";
private static final String USER_PHONENO ="PhoneNumber";
private static final String USER_COLLEGE ="College";
private static final String USER_COURSE ="Course";
public DatabaseHandler(Context context){
super(context, DATABASE_Name, null, DATABASE_Version);
}
public void onCreate(SQLiteDatabase db) {
String CREATE_USERS_TABLE = "CREATE TABLE " + TABLE_USERS + "("
+ USER_NAME + " TEXT," + USER_PASSWRD + " TEXT,"
+ USER_REPASSWRD + " TEXT," + USER_EMAIL + " TEXT PRIMARY KEY," + USER_PHONENO +" INTEGER," + USER_COLLEGE + " TEXT,"
+ USER_COURSE + " TEXT);" ;
db.execSQL(CREATE_USERS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERS);
// Create tables again
onCreate(db);
}
public void addUser(signup users) {
db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(USER_NAME, users.getName()); // Contact Name
values.put(USER_PASSWRD, users.getPasswrd());
values.put(USER_REPASSWRD, users.getRepaswrd());
values.put(USER_EMAIL, users.getEmail());
values.put(USER_AGE, users.getAge());
values.put(USER_PHONENO, users.getPhoneno());
values.put(USER_COLLEGE, users.getCollege());
values.put(USER_COURSE, users.getCourse()); // Contact Phone Number
// Inserting Row
db.insert(TABLE_USERS, null, values);
db.close(); // Closing database connection
}
public void open()
{
db = this.getWritableDatabase();
}
public void close()
{
this.close();
}
public boolean Login(String username, String password) throws SQLException
{
db = null;
Cursor mCursor = db.rawQuery("SELECT * FROM " + TABLE_USERS + " WHERE ``username=? AND password=?", new String[]{username,password});
if (mCursor != null) {
if(mCursor.getCount() > 0)
{
return true;
}
}
return false;
}
RegisterActivity.Java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
final DatabaseHandler db=new DatabaseHandler(this);
final TextView name1 = (TextView) findViewById(R.id.name);
final TextView pwd1 = (TextView) findViewById(R.id.paswrd);
final TextView cnfrm1 = (TextView) findViewById(R.id.repaswrd);
final TextView email1 = (TextView) findViewById(R.id.email);
final TextView age1 = (TextView) findViewById(R.id.age);
final TextView phone1 = (TextView) findViewById(R.id.phone);
final TextView college1 = (TextView) findViewById(R.id.college);
final TextView course1 = (TextView) findViewById(R.id.course);
Button signup = (Button) findViewById(R.id.button);
View.OnClickListener sp = new View.OnClickListener()
{
@Override
public void onClick(View v) {
String name = name1.getText().toString();
String pwd = pwd1.getText().toString();
String cnfrm = cnfrm1.getText().toString();
String email = email1.getText().toString();
String age = age1.getText().toString();
String phone = phone1.getText().toString();
String college = college1.getText().toString();
String course = course1.getText().toString();
if (name.isEmpty()) {
name1.setError("Enter Name");
} else if (pwd.isEmpty()) {
pwd1.setError("Enter Password");
} else if (cnfrm.isEmpty()) {
cnfrm1.setError("Enter Confirm Password ");
} else if (email.isEmpty()) {
email1.setError("Enter Email");
} else if (age.isEmpty()) {
age1.setError("Enter Age");
} else if (phone.isEmpty()) {
phone1.setError("Enter Phone Number");
} else if (college.isEmpty()) {
college1.setError("Enter College name");
} else if (course.isEmpty()) {
course1.setError("Enter Course");
} else if (!(pwd.equals(cnfrm))) {
cnfrm1.setError("Password doesn't Match");
} else {
String name_1= name1.getText().toString();
String pass_1= pwd1.getText().toString();
String repass_1= cnfrm1.getText().toString();
String email_1= email1.getText().toString();
String age_1= age1.getText().toString();
String phoneno_1= phone1.getText().toString();
String clg_1= college1.getText().toString();
String course_1= course1.getText().toString();
Log.d("Insert: ", "Inserting ..");
db.addUser(new signup(name_1, pass_1, repass_1, email_1, age_1, phoneno_1, clg_1, course_1));
Toast.makeText(getApplicationContext(), "Successfully Signed in", Toast.LENGTH_LONG).show();
Intent intent=new Intent(RegisterActivity.this,FirstActivity.class);
startActivity(intent);
}
}
};
signup.setOnClickListener(sp);
Button reset=(Button) findViewById(R.id.rest);
View.OnClickListener rs= new View.OnClickListener() {
@Override
public void onClick(View v) {
((TextView) findViewById(R.id.name)).setText(null);
((TextView) findViewById(R.id.course)).setText(null);
((TextView) findViewById(R.id.email)).setText(null);
((TextView) findViewById(R.id.age)).setText(null);
((TextView) findViewById(R.id.college)).setText(null);
((TextView) findViewById(R.id.paswrd)).setText(null);
((TextView) findViewById(R.id.repaswrd)).setText(null);
((TextView) findViewById(R.id.phone)).setText(null);
}
};
reset.setOnClickListener(rs);
}
signup.Java
public class signup {
String name;
String passwrd;
String repaswrd;
String email;
String age;
String phoneno;
String college;
String course;
public signup(String name,String passwrd,String repaswrd,String email,String age,String phoneno,String college,String course){
this.name=name;
this.passwrd=passwrd;
this.repaswrd=repaswrd;
this.email=email;
this.age=age;
this.phoneno=phoneno;
this.college=college;
this.course=course;
}
public signup(String name,String passwrd,String repaswrd,String email,String college,String course){
this.name=name;
this.passwrd=passwrd;
this.repaswrd=repaswrd;
this.email=email;
this.college=college;
this.course=course;
}
public String getName(){
return this.name;
}
public String getPasswrd(){
return this.passwrd;
}
public String getRepaswrd(){
return this.repaswrd;
}
public String getEmail(){
return this.email;
}
public String getAge(){
return this.age;
}
public String getPhoneno(){
return this.phoneno;
}
public String getCollege(){
return this.college;
}
public String getCourse(){
return this.course;
}
}
错误：
E / SQLiteLog：（1）表用户没有名为Course的列 01-25 22：45：31.414 12064-12064 / com.pixel.sri.justdoit E / SQLiteDatabase：插入课程时出错= B.E ReEnterPassword = sri Passwrod = sri Email = sriram.mdu31@gmail.com College = APEC PhoneNumber = 7402043073年龄= 21姓名= sriram android.database.sqlite.SQLiteException：table用户没有列 命名课程（代码1）:,编译时：INSERT INTO 用户（场，ReEnterPassword，Passwrod，电子邮件，学院，******中国，年龄，姓名） 价值观（？，？，？，？，？，？，？，？） 在 android.database.sqlite.SQLiteConnection.nativePrepareStatement（母语 方法） 在 android.database.sqlite.SQLiteConnection.acquirePreparedStatement（SQLiteConnection.java:887） 在 android.database.sqlite.SQLiteConnection.prepare（SQLiteConnection.java:498） 在 android.database.sqlite.SQLiteSession.prepare（SQLiteSession.java:588） 在android.database.sqlite.SQLiteProgram。（SQLiteProgram.java:58） 在 android.database.sqlite.SQLiteStatement。（SQLiteStatement.java:31） 在 android.database.sqlite.SQLiteDatabase.insertWithOnConflict（SQLiteDatabase.java:1469） 在 android.database.sqlite.SQLiteDatabase.insert（SQLiteDatabase.java:1341） 在 com.pixel.sri.justdoit.DatabaseHandler.addUser（DatabaseHandler.java:66） 在 com.pixel.sri.justdoit.RegisterActivity $ 1.onClick（RegisterActivity.java:81） 在android.view.View.performClick（View.java:5201） 在android.view.View $ PerformClick.run（View.java:21163） 在android.os.Handler.handleCallback（Handler.java:746） 在android.os.Handler.dispatchMessage（Handler.java:95） 在android.os.Looper.loop（Looper.java:148） 在android.app.ActivityThread.main（ActivityThread.java:5443） at java.lang.reflect.Method.invoke（Native Method） 在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:728） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:618） 01-25 22：45：31.572 12064-12089 / com.pixel.sri.justdoit V / RenderScript：0xb8b446f0启动线程，CPU 8
答案 0 :(得分：1)
您可能在上次运行之后添加了列，此时数据库已经创建。
解决方案：卸载并重新安装您的应用 替代解决方案：增加DATABASE_VERSION常量值。
答案 1 :(得分：1)
如果Course列是数据库的最新添加项，但是您忘记增加数据库版本，则这种情况很常见。
使用您拥有的代码，碰撞数据库版本将擦除数据库并使用正确的列重新创建数据库。
或者，卸载并重新安装您的应用应该修复它。