創建數據庫時出錯

Question

我在創建一個提交按鈕，保存用戶可以在其上鍵入的三個編輯文本的結果。但出錯了。我只有一個活動的，哪些是註冊，資料表，以及DatabaseOperations 請看這裏的代碼三個Java類： XML：

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:text="First,Last" 
    android:ems="10" 
    android:id="@+id/txtName" 
    android:textSize="10dp" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/textView2" 
    android:layout_toEndOf="@+id/textView2" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textEmailAddress" 
    android:ems="10" 
    android:id="@+id/txtEmail" 
    android:textSize="10dp" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/textView3" 
    android:layout_toEndOf="@+id/textView3" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/txtFood" 
    android:textSize="8dp" 
    android:layout_alignBottom="@+id/textView" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_alignLeft="@+id/txtEmail" 
    android:layout_alignStart="@+id/txtEmail" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Favorite Restaurant" 
    android:id="@+id/textView" 
    android:textSize="10dp" 
    android:textColor="#ff4713ff" 
    android:layout_below="@+id/textView4" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:paddingLeft="10dp" /> 

<!--suppress AndroidDomInspection --> 

<RadioGroup 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:id="@+id/rg1" 
    android:layout_below="@+id/textView" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true"> 

    <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="McDonald&apos;s" 
     android:id="@+id/radioButton" 
     android:elegantTextHeight="false" 
     android:state_checked="true" 
     android:checked="false" 
     android:button="@android:drawable/btn_radio" 
     android:layout_below="@+id/textView" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:textSize="10dp" 
     android:layout_marginTop="0dp" /> 

    <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Burger King" 
     android:id="@+id/radioButton2" 
     android:elegantTextHeight="false" 
     android:state_checked="true" 
     android:checked="false" 
     android:button="@android:drawable/btn_radio" 
     android:layout_alignTop="@+id/radioButton" 
     android:layout_toRightOf="@+id/txtFood" 
     android:layout_toEndOf="@+id/txtFood" 
     android:textSize="10dp" 
     android:layout_marginTop="-15dp" /> 

    <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Wendy&apos;s" 
     android:id="@+id/radioButton4" 
     android:elegantTextHeight="false" 
     android:state_checked="true" 

     android:checked="false" 
     android:button="@android:drawable/btn_radio" 
     android:layout_alignBaseline="@+id/radioButton3" 
     android:layout_alignBottom="@+id/radioButton3" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentEnd="true" 
     android:textSize="10dp" 
     android:layout_marginTop="-15dp" /> 

    <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Papa John&apos;s Pizza" 
     android:id="@+id/radioButton5" 
     android:elegantTextHeight="false" 
     android:state_checked="true" 
     android:checked="false" 
     android:button="@android:drawable/btn_radio" 
     android:layout_below="@+id/radioButton4" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:textSize="10dp" 
     android:layout_marginTop="-15dp" /> 

    <RadioButton 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="Next" 
     android:id="@+id/radioButton3" 
     android:elegantTextHeight="false" 
     android:state_checked="true" 

     android:checked="false" 
     android:button="@android:drawable/btn_radio" 
     android:textSize="10dp" 
     android:layout_below="@+id/rg1" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="-15dp" /> 

</RadioGroup> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Submit" 
    android:id="@+id/button3" 
    android:textSize="10dp" 
    android:clickable="true" 
    android:enabled="true" 
    android:onClick="Submit" 
    android:layout_below="@+id/rg1" 
    android:layout_alignLeft="@+id/txtName" 
    android:layout_alignStart="@+id/txtName" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Name" 
    android:id="@+id/textView2" 
    android:textSize="10dp" 
    android:textColor="#ff4713ff" 
    android:layout_alignBaseline="@+id/txtName" 
    android:layout_alignBottom="@+id/txtName" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:paddingLeft="10dp" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Email" 
    android:id="@+id/textView3" 
    android:textSize="10dp" 
    android:textColor="#ff4713ff" 
    android:layout_alignBaseline="@+id/txtName" 
    android:layout_alignBottom="@+id/txtName" 
    android:layout_alignLeft="@+id/button8" 
    android:layout_alignStart="@+id/button8" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Favorite Food" 
    android:id="@+id/textView4" 
    android:textSize="10dp" 
    android:textColor="#ff4713ff" 
    android:layout_below="@+id/txtName" 
    android:layout_toRightOf="@+id/button3" 
    android:layout_toEndOf="@+id/button3" /> 

<CheckBox 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Email Me" 
    android:id="@+id/checkBox" 

    android:checked="false" 
    android:layout_marginBottom="16dp" 
    android:layout_alignBottom="@+id/rg1" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_marginRight="19dp" 
    android:layout_marginEnd="19dp" 
    android:enabled="true" 
    android:clickable="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Home" 
    android:id="@+id/button8" 
    android:textSize="10dp" 
    android:clickable="true" 
    android:enabled="true" 
    android:onClick="HomePage" 
    android:layout_below="@+id/rg1" 
    android:layout_toRightOf="@+id/txtName" 
    android:layout_toEndOf="@+id/txtName" /> 

Java代碼：

package com.example.android.ch2; 
import android.content.Context; 
import android.content.Intent; 
import android.database.sqlite.SQLiteDatabase; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.RadioGroup; 
import android.widget.Toast; 


public class SignUp extends ActionBarActivity { 
EditText nameTxt,emailTxt,foodTxt; 
String user_name,user_email,user_food; 
Button REG; 
Context ctx = this; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sign_up); 
    nameTxt = (EditText) findViewById(R.id.txtName); 
    emailTxt = (EditText) findViewById(R.id.txtEmail); 
    foodTxt = (EditText) findViewById(R.id.txtFood); 
    REG = (Button) findViewById(R.id.button3); 
    REG.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      user_name = nameTxt.getText().toString(); 
      user_email = emailTxt.getText().toString(); 
      user_food = foodTxt.getText().toString(); 

     } 

     DatabaseOperations DB = new DatabaseOperations(ctx); 
     DB.putInformation(DB,user_name,user_email,user_food); 

    }); 
    } 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_sign_up, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 

} 
public void HomePage(View v){ 
    Intent intent=new Intent(v.getContext(),Login.class); 
    startActivity(intent); 

}} 

表Jave：

package com.example.android.ch2; 

import android.provider.BaseColumns; 


public class TableData { 
public TableData(){ 

} 
public static abstract class TableInfo implements BaseColumns{ 
    public static final String USER_NAME = "user_name"; 
    public static final String USER_EMAIL = "user_email"; 
    public static final String USER_FOOD = "user_food"; 
    public static final String DATABASE_NAME = "user_info"; 
    public static final String TABLE_NAME = "reg_info";a 
} 
} 

數據庫中的Java

package com.example.android.ch2; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 


public class DatabaseOperations extends SQLiteOpenHelper { 
public static final int database_version = 1; 
public String CREATE_QUERY = "CREATE TABLE"+ TableData.TableInfo.TABLE_NAME+" ("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_EMAIL+"  TEXT,"+ TableData.TableInfo.USER_FOOD+" TEXT);"; 
public DatabaseOperations(Context context){ 
    super(context, TableData.TableInfo.DATABASE_NAME,null,database_version); 
} 

@Override 
public void onCreate(SQLiteDatabase sdb) { 
    sdb.execSQL(CREATE_QUERY); 
    Log.d("Database Operations", "Table created"); 

} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 

} 
public void putInformation (DatabaseOperations dop, String name,String email,String food){ 

SQLiteDatabase SQ = dop.getWritableDatabase(); 
    ContentValues cv = new ContentValues(); 
    cv.put(TableData.TableInfo.USER_NAME, name); 
    cv.put(TableData.TableInfo.USER_EMAIL, email); 
    cv.put(TableData.TableInfo.USER_FOOD, food); 
    long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv); 
    Log.d ("Database operations", "One raw inserted"); 

    } 
} 

logcat的一塊：

-06 22:25:41.718 4004-4004/? E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.android.ch2, 
PID: 4004 android.database.sqlite.SQLiteException: near "TABLEreg_info": syntax error (code 1): , while compiling: 
CREATE TABLEreg_info(user_name TEXT,user_email TEXT,user_food TEXT); at android.database.sqlite.SQLiteConnection.nativePrepareStatement 
(Native Method 

Answer 1

你不必TABLE和TableData.TableInfo.TABLE_NAME之間的空間

使用此

公共字符串CREATE_QUERY =「CREATE TABLE」+ TableData.TableInfo.TABLE_NAME +「（」+ Ta bleData.TableInfo.USER_NAME +「TEXT」+ TableData.TableInfo.USER_EMAIL +「TEXT」+ TableData.TableInfo.USER_FOOD +「TEXT」;「;

不是這

公共字符串CREATE_QUERY = 「CREATE TABLE」 + TableData.TableInfo.TABLE_NAME + 「（ 」+ TableData.TableInfo.USER_NAME +「 TEXT 」+ TableData.TableInfo.USER_EMAIL +「 TEXT」 + TableData.TableInfo.USER_FOOD +「TEXT）;」;

見空間後表在字符串中