SQLite数据库中的运行时错误

时间：2016-12-29 06:07:23

标签： android sqlite

我在这里实现了一个SQLite数据库。该数据库由类Contact的对象组成。但是我的应用程序一开始就崩溃了。这是Logcat和代码。

logcat的 

FATAL EXCEPTION: main
Process: com.example.nirvan.sqliteexample, PID: 30065
java.lang.RuntimeException: Unable to start activity ComponentInfo {
  com.example.nirvan.sqliteexample / com.example.nirvan.sqliteexample.MainActivity
 }: android.database.sqlite.SQLiteException: near "TABLEcontacts": syntax error(code 1): ,
 while compiling: CREATE TABLEcontacts(idINTEGER KEYname TEXT)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2198)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2257)
at android.app.ActivityThread.access$800(ActivityThread.java: 139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1210)
at android.os.Handler.dispatchMessage(Handler.java: 102)
at android.os.Looper.loop(Looper.java: 136)
at android.app.ActivityThread.main(ActivityThread.java: 5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java: 515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: near "TABLEcontacts": syntax error(code 1): ,
 while compiling: CREATE TABLEcontacts(idINTEGER KEYname TEXT)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java: 889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java: 500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java: 588)
at android.database.sqlite.SQLiteProgram. < init > (SQLiteProgram.java: 58)
at android.database.sqlite.SQLiteStatement. < init > (SQLiteStatement.java: 31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java: 1672)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java: 1603)
at com.example.nirvan.sqliteexample.DatabaseHandler.onCreate(DatabaseHandler.java: 28)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java: 252)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java: 164)
at com.example.nirvan.sqliteexample.DatabaseHandler.addContact(DatabaseHandler.java: 40)
at com.example.nirvan.sqliteexample.MainActivity.onCreate(MainActivity.java: 21)
at android.app.Activity.performCreate(Activity.java: 5248)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1110)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2162)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2257) 
at android.app.ActivityThread.access$800(ActivityThread.java: 139) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1210) 

FATAL EXCEPTION: main
Process: com.example.nirvan.sqliteexample, PID: 32547
java.lang.RuntimeException: Unable to start activity ComponentInfo {
  com.example.nirvan.sqliteexample / com.example.nirvan.sqliteexample.MainActivity
 }: android.database.sqlite.SQLiteException: near "TABLEcontacts": syntax error(code 1): ,
 while compiling: CREATE TABLEcontacts(idINTEGER KEYname TEXT)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2198)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2257)
at android.app.ActivityThread.access$800(ActivityThread.java: 139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1210)
at android.os.Handler.dispatchMessage(Handler.java: 102)
at android.os.Looper.loop(Looper.java: 136)
at android.app.ActivityThread.main(ActivityThread.java: 5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java: 515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: near "TABLEcontacts": syntax error(code 1): ,
 while compiling: CREATE TABLEcontacts(idINTEGER KEYname TEXT)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java: 889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java: 500)

MainActivity.java 

package com.example.nirvan.sqliteexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    DatabaseHandler db = new DatabaseHandler(this);

    // Inserting Contacts
    //Log.d("Insert: ", "Inserting ..");
    db.addContact(new Contact(1, "one"));
    db.addContact(new Contact(2, "two"));
    db.addContact(new Contact(3, "three"));


    TextView text=(TextView) findViewById(R.id.text);
    Contact cn;
    cn=db.getContact(2);
    text.setText(cn.name);
}



}

Contact.java 

public class Contact
{
public String name;
public int id;

Contact(int id, String name)
{
    this.id=id;
    this.name=name;
}


}

DatabaseHandler.java 

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHandler extends SQLiteOpenHelper
{
 private static final int DATABASE_VERSION=1;
 private static final String DATABASE_NAME="contactsManager";
 private static final String TABLE_CONTACTS="contacts";
 private static final String KEY_ID="id";
 private static final String KEY_NAME="name";

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

@Override
public void onCreate(SQLiteDatabase db)
{
    String CREATE_CONTACTS_TABLE="CREATE TABLE"+TABLE_CONTACTS+"("+KEY_ID+"INTEGER PRIMARY KEY"+KEY_NAME+" TEXT"+")";
    db.execSQL(CREATE_CONTACTS_TABLE);
}

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

void addContact(Contact contact)
{
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_NAME, contact.name);
    values.put(KEY_ID, contact.id);

    // Inserting Row
    db.insert(TABLE_CONTACTS, null, values);
    //2nd argument is String containing nullColumnHack
    db.close(); // Closing database connection
}

Contact getContact(int id)
{
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
                    KEY_NAME}, KEY_ID + "=?",
            new String[] { String.valueOf(id) }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
            cursor.getString(1));
    // return contact
    return contact;
}

public int updateContact(Contact contact)
{
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_NAME, contact.name);


    // updating row
    return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
            new String[] { String.valueOf(contact.id) });
}


}

activityMain.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.nirvan.sqliteexample.MainActivity">

<TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!" />
</RelativeLayout>

3 个答案:

答案 0 :(得分：1)

您在数据库中执行的查询是一个简单的错误。为关键字添加一些空格，不要混淆Sqlite，如下所示

@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "(" + KEY_ID + " INTEGER PRIMARY KEY, " + KEY_NAME + " TEXT " + ")";
    db.execSQL(CREATE_CONTACTS_TABLE);
}

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

答案 1 :(得分：1)

请参阅this，了解如何正确创建数据库。在＆＃34; CREATE TABLE＆＃34;之后，您将缺少空格。和TABLE_CONTACTS

答案 2 :(得分：1)

试试这个，

您在CREATE TABLE语句后错过了空间，我认为在PRIMARY KEY之后逗号（，） 

String CREATE_CONTACTS_TABLE="CREATE TABLE "+ TABLE_CONTACTS + "(" + KEY_ID + " INTEGER PRIMARY KEY, " + KEY_NAME + " TEXT"+")";
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