当我尝试使用sqlite将数据插入表中时，Android应用程序关闭

Question

我正在开发一个应用程序，可以将数据插入数据库。当我按下添加按钮时，数据被插入到数据库中。但是当我按下添加按钮时，应用程序停止工作并返回主页。我附上UI截图和代码。

这是数据库架构代码：

import android.content.ContentValues; 
import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.provider.BaseColumns; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.database.sqlite.SQLiteOpenHelper; 

public class DB_EVENTS extends SQLiteOpenHelper { 
public static final String db_name="Events.db"; 
public static final String table_name="eventstable"; 
public static final String col="ID"; 
public static final String col1="Event name"; 
public static final String col2="Price "; 
public static final String col3="Date "; 
public static final String col4="Capacity"; 
public static final String col5="Promocode"; 

//String test1=Createevent.msg; 

public DB_EVENTS(Context context) { 
    super(context,db_name, null,1); 
    // SQLiteDatabase db=this.getWritableDatabase(); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL("create table"+table_name+"(ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,PRICE TEXT,DATE TEXT,CAPACITY TEXT,PROMOCODE TEXT)"); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    db.execSQL("DROP TABLE IF EXISTS"+ table_name); 
    onCreate(db); 

} 
public boolean insert_data(String name,String price ,String date,String  capacity,String promocode){ 
SQLiteDatabase db=this.getWritableDatabase(); 
ContentValues contentValues=new ContentValues(); 
contentValues.put(col1,name); 
contentValues.put(col2,price); 
contentValues.put(col3,promocode); 
contentValues.put(col4,date); 
contentValues.put(col5,capacity); 

long result=db.insert(table_name,null,contentValues); 
if(result==-1) 
{ 
    return false; 
} 
else{ 
    return true; 
} 
} 

} 

这是主要的活动代码：

import android.content.Intent; 
import android.provider.BaseColumns; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 


public class Createevent extends AppCompatActivity { 
DB_EVENTS db; 


public static final String msg1 = " "; 
public static final String msg2 = " "; 
public static final String msg3 = " "; 
public static final String msg4 = " "; 
public static final String msg5 = " "; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_createevent); 
    db=new DB_EVENTS(this); 

} 
public void add(View view) 
{ 


    EditText editText1 = (EditText) findViewById(R.id.editText); 
    String message1 = editText1.getText().toString(); 
    EditText editText2 = (EditText) findViewById(R.id.editText3); 
    String message2 = editText2.getText().toString(); 
    EditText editText3 = (EditText) findViewById(R.id.editText4); 
    String message3 = editText3.getText().toString(); 
    EditText editText4 = (EditText) findViewById(R.id.editText5); 
    String message4 = editText4.getText().toString(); 
    EditText editText5 = (EditText) findViewById(R.id.editText6); 
    String message5 = editText5.getText().toString(); 
    boolean isinserted=db.insert_data(message1,message2,message3, 
     message4,message5); 
    if(isinserted==true){ 

    Toast.makeText(Createevent.this,"Data inserted" 
     ,Toast.LENGTH_LONG).show(); 
    } 
    else{Toast.makeText(Createevent.this, 
    "Data not inserted",Toast.LENGTH_LONG).show(); 
    } 



} 

} 


    This is the UI code: 
    [![This is the screenshot of the UI of my app][1]][1] 
    <?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:id="@+id/activity_createevent" 
     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.parth.eventmgmtsystem.Createevent"> 

    <TextView 
    android:text="Fill in the details to create an event" 
    android:layout_width="wrap_content" 
    android:layout_height="30dp" 
    android:id="@+id/textView" 
    android:layout_alignParentStart="true" 
    android:layout_marginStart="24dp" 
    android:layout_alignParentTop="true" /> 

    <TextView 
    android:text="Price" 
    android:layout_width="100dp" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/editText" 
    android:layout_alignStart="@+id/textView4" 
    android:layout_marginTop="31dp" 
    android:id="@+id/textView5" /> 

    <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="20dp" 
    android:inputType="textPersonName" 
    android:text=" " 
    android:ems="10" 
    android:layout_alignBottom="@+id/textView5" 
    android:layout_toEndOf="@+id/textView5" 
    android:layout_marginStart="36dp" 
    android:id="@+id/editText3" /> 

    <TextView 
    android:text="Date" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="39dp" 
    android:id="@+id/textView6" 
    android:layout_below="@+id/textView5" 
    android:layout_alignStart="@+id/textView5" /> 

    <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:ems="10" 
    android:id="@+id/editText4" 
    android:layout_alignBaseline="@+id/textView6" 
    android:layout_alignBottom="@+id/textView6" 
    android:layout_toEndOf="@+id/textView" /> 

    <Button 
    android:text="ADD" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_toEndOf="@+id/textView5" 
    android:layout_marginBottom="13dp" 
    android:id="@+id/button3" 
    android:onClick="add"/> 

    <TextView 
    android:text="Capacity" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/textView7" 
    android:layout_centerVertical="true" /> 

    <TextView 
    android:text="Promocode" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="64dp" 
    android:id="@+id/textView8" 
    android:layout_below="@+id/textView7" 
    android:layout_alignParentStart="true" /> 

    <TextView 
    android:text="Enter the name of the event" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/textView3" 
    android:layout_marginTop="15dp" 
    android:layout_below="@+id/textView" 
    android:layout_alignEnd="@+id/button3" 
    android:layout_marginEnd="29dp" /> 

    <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:ems="10" 
    android:id="@+id/editText" 
    android:layout_alignTop="@+id/textView3" 
    android:layout_alignParentEnd="true" 
    android:layout_toEndOf="@+id/button3" /> 

    <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:text=" " 
    android:ems="10" 
    android:id="@+id/editText6" 
    android:layout_alignTop="@+id/textView8" 
    android:layout_alignStart="@+id/editText5" /> 

    <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:ems="10" 
    android:id="@+id/editText5" 
    android:layout_alignTop="@+id/textView7" 
    android:layout_alignStart="@+id/editText3" /> 
    </RelativeLayout> 

Answer 1

你创建表是不正确的。该空间是不正确的，应该是：

db.execSQL("CREATE TABLE "+table_name+" (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,PRICE TEXT,DATE TEXT,CAPACITY TEXT,PROMOCODE TEXT)"); 

而且删除表空间：

db.execSQL("DROP TABLE IF EXISTS "+ table_name);