爲什麼我的插入查詢不工作..？

我是Android新手。我想在這個過程中將數據存儲在Android SQLite中，我插入了一些值，但它們沒有插入。我在哪裏做錯了。我沒有得到解決方案，請幫助我。爲什麼我的插入查詢不工作..？

Mainacticity.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:paddingLeft="10sp" 
    android:paddingRight="10sp" 
    tools:context="com.example.admin.justtrail.MainActivity"> 
    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:hint="user name" 
     android:gravity="center" 
     android:id="@+id/loginusernameid" 
     android:layout_marginTop="10sp" 
     /> 
    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:hint="password" 
     android:gravity="center" 
     android:id="@+id/loginpasswordid" 
     android:layout_marginTop="10sp" 
     /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="login" 
     android:onClick="logIn" 
     android:id="@+id/logid"/> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="signup" 
     android:id="@+id/signupid" 
     android:onClick="signup"/> 
    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:onClick="select" 
     android:text="select"/> 
</LinearLayout>

MainActivity.java：

package com.example.admin.justtrail; 

import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.support.v7.app.AlertDialog; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 

import java.io.File; 

public class MainActivity extends AppCompatActivity { 
    DatabaseHandler databaseHandler=new DatabaseHandler(MainActivity.this); 
    EditText loginusername,loginpassword; 
    String data; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     loginpassword = (EditText)findViewById(R.id.loginpasswordid); 
     loginusername = (EditText)findViewById(R.id.loginusernameid); 

    } 

    public void logIn(View view) 
    { 
     String logusername=loginusername.getText().toString(); 
     String logpassword=loginpassword.getText().toString(); 
     // Object usernaeme; 
     String data = databaseHandler.check(logusername,logpassword); 
     Log.v("sdfsdfsf",data); 
    } 

    public void signup(View view) 
    { 
     // String DATABASE_NAME="Chandu"; 
     // String TABLE_NAME="fbdatabase"; 
     Intent intent=new Intent(getApplicationContext(),Signup.class); 
     startActivity(intent); 
     /* File file = new File(String.valueOf(getDatabasePath(TABLE_NAME))); 
     boolean bb =file.isFile(); 

     if(bb ==true) 
     { 

      Toast.makeText(getApplicationContext(),"table is created",Toast.LENGTH_LONG).show(); 
     } 
     else 
     { 
      Toast.makeText(getApplicationContext(),"table is not created",Toast.LENGTH_LONG).show(); 

     }*/ 
    } 

    public void select(View view) 
    { 
     final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this); 
     alertDialogBuilder.setMessage("Are you sure you want see data?"); 

     alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() 
     { 
      @Override 
      public void onClick(DialogInterface arg0, int arg1) { 
       data= databaseHandler.seclctquery(); 
       Data da = new Data(); 

       gotosecond(); 
      } 
     }); 
     alertDialogBuilder.show(); 
    } 

    private void gotosecond() 
    { 
     final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this); 
     alertDialogBuilder.setMessage(data); 
     alertDialogBuilder.show(); 
    } 
}

signup.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.admin.justtrail.Signup"> 
    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:hint="Name" 
     android:gravity="center" 
     android:id="@+id/nameid" 
     /> 
    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:hint="User Name" 
     android:gravity="center" 
     android:id="@+id/signupusernameid" 
     android:layout_marginTop="40sp"/> 
    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:hint="Password" 
     android:id="@+id/singuppasswordid" 
     android:layout_marginTop="80sp" 
     android:inputType="textPassword" 
     android:gravity="center"/> 
    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Submit" 
     android:id="@+id/signupsubmitid" 
     android:layout_marginTop="120sp"/> 

</RelativeLayout>

Signup.java：

package com.example.admin.justtrail; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class Signup extends AppCompatActivity { 
    EditText ename,eusername,epassword; 
    DatabaseHandler databaseHandler=new DatabaseHandler(Signup.this); 
    Button subbutton; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_signup); 
     ename=(EditText)findViewById(R.id.nameid); 
     eusername=(EditText)findViewById(R.id.signupusernameid); 
     epassword=(EditText)findViewById(R.id.singuppasswordid); 
     subbutton=(Button)findViewById(R.id.signupsubmitid); 
     subbutton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       String Name=ename.getText().toString(); 
       String Username=eusername.getText().toString(); 
       String Password=epassword.getText().toString(); 
       Data da=new Data(); 
       da.setName(Name); 
       da.setUsername(Username); 
       da.setPassword(Password); 
       databaseHandler.addPersion(Name,Username,Password); 
       ename.setText(""); 
       eusername.setText(""); 
       epassword.setText(""); 
       Toast.makeText(getApplicationContext(),"sign up success",Toast.LENGTH_LONG).show(); 
      } 
     }); 
    } 
}

Data.java：

package com.example.admin.justtrail; 

/** 
* Created by admin on 9/16/2016. 
*/ 
public class Data { 
    // Data da=new Data(); 
    String Name; 
    String Username; 
    String Password; 


    public String getName() { 
     return Name; 
    } 

    public String getUsername() { 
     return Username; 
    } 
    public String getPassword() { 
     return Password; 
    } 

    public void setName(String name) { 
     Name = name; 
    } 

    public void setUsername(String username) { 
     Username = username; 
    } 
    public void setPassword(String password){ 
     Password=password; 
    } 


}

DatabaseHelper.java：

package com.example.admin.justtrail; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 
/** 
* Created by admin on 9/15/2016. 
*/ 
public class DatabaseHandler extends SQLiteOpenHelper { 
    private static final String DATABASE_NAME="Chandu"; 
    private static final int DATABASE_VERSION=1; 
    private static final String TABLE_NAME="fbdatabase"; 
    private static final String ID="ID"; 
    private static final String NAME="NAME"; 
    private static final String USER_NAME="USER_NAME"; 
    private static final String PASSWORD="PASSWORD"; 

    public DatabaseHandler(Context context) { 
     super(context,DATABASE_NAME,null,DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase sqLiteDatabase) { 
     String query = "CREATE TABLE"+" "+ TABLE_NAME +"("+ID +" INTEGER PRIMARY KEY AUTOINCREMENT,"+NAME +"TEXT,"+USER_NAME +"TEXT,"+PASSWORD +"VARCHAR"+");"; 
     Log.v("sdfsdf", query); 
     sqLiteDatabase.execSQL(query); 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) { 
     sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); 
     // Create tables again 
     onCreate(sqLiteDatabase); 
    } 

    public void addPersion(String name,String user_name,String password) 
    { 
     SQLiteDatabase sqLiteDatabase=this.getWritableDatabase(); 
     ContentValues values=new ContentValues(); 
     values.put(NAME,name); 
     values.put(USER_NAME,user_name); 
     values.put(PASSWORD,password); 
     sqLiteDatabase.insert(TABLE_NAME,null,values); 
     sqLiteDatabase.close(); 
    } 

    public String check(String USER_NAME,String PASSWORD) 
    { 
     SQLiteDatabase sqLiteDatabase = this.getWritableDatabase(); 

     //String seclectquery = "SELECT "+USER_NAME +","+PASSWORD +" FROM"+" "+TABLE_NAME+";"; 
     //Select * from database where username = '+USER_NAME+',password ='+PASSWORD+'; 
     String seclectquery = "SELECT * FROM "+TABLE_NAME+" WHERE username="+USER_NAME+",password="+PASSWORD+";"; 
     sqLiteDatabase.execSQL(seclectquery); 
     return seclectquery; 
    } 

    public String selectquery () { 
     SQLiteDatabase sqLiteDatabase = this.getWritableDatabase(); 
     String query1 = "SELECT * FROM"+" "+TABLE_NAME; 
     // sqLiteDatabase.execSQL(query1); 
     Cursor cursor = sqLiteDatabase.rawQuery(query1, null); 
     String line=""; 
     int i =0; 
     if(cursor.moveToFirst()) 
     { 


      do { 
       String s1 = cursor.getString(0); 
       String s2 = cursor.getString(1); 
       String s3 = cursor.getString(2); 
       String s4 = cursor.getString(3); 

       Log.v("asdasdadasdas",s1); 
       Log.v("asdasdadasdas",s2); 
       Log.v("asdasdadasdas",s3); 
       Log.v("asdasdadasdas",s4); 
       line = line+s1 + s2 + s3 + s4+"\n"; 
      } 
      while (cursor.moveToNext()); 
     } 

     return line; 

    } 


}

來源

2016-09-16 chinna

在logcat中的任何錯誤打印？ –

不，我沒有得到任何錯誤 – chinna

第一個問題我遇到到目前爲止是你缺少列名和數據類型之間的空間，同時創建表。

更改此

String query = "CREATE TABLE"+" "+ TABLE_NAME +"("+ID +" INTEGER PRIMARY KEY AUTOINCREMENT,"+NAME +"TEXT,"+USER_NAME +"TEXT,"+PASSWORD +"VARCHAR"+");";

到

String query = "CREATE TABLE"+" "+ TABLE_NAME +"("+ID +" INTEGER PRIMARY KEY AUTOINCREMENT,"+NAME +" TEXT,"+USER_NAME +" TEXT,"+PASSWORD +" VARCHAR"+");";

來源

2016-09-16 10:28:20

android.database.sqlite.SQLiteException：表fbdatabase沒有名爲NAME的列（代碼1）：，編譯時：INSERT INTO fbdatabase（NAME，PASSWORD，USER_NAME）VALUES（？，？，？） at android.database.sqlite.SQLiteConnection.nativePrepareStatement（Native Method） – chinna

當我使用您的querry時出現此錯誤 – chinna

清除數據或重新安裝應用程序。應用我答案中給出的解決方案，然後再次安裝。 –

爲什麼我的插入查詢不工作..？

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