android中的sqlite数据库(致命错误)
我从安卓开始 我在androidsdk2.2中创建了sqlite数据库,但在belove代码中生成了一个致命错误 帮帮我 第一档android中的sqlite数据库(致命错误),android,Android,我从安卓开始 我在androidsdk2.2中创建了sqlite数据库,但在belove代码中生成了一个致命错误 帮帮我 第一档 package com.and.database.demo; import java.util.List; import com.and.database.helper.MyHelperActivity; import android.app.Activity; import android.os.Bundle; import android.util.Log; i
package com.and.database.demo;
import java.util.List;
import com.and.database.helper.MyHelperActivity;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class MyDatabaseActivity extends Activity {
private TextView text_out;
private MyHelperActivity dh;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text_out = (TextView)findViewById(R.id.textout);
this.dh = new MyHelperActivity(this);
this.dh.deleteAll();
this.dh.insert("durgesh");
this.dh.insert("Mukesh");
this.dh.insert("Sk");
this.dh.insert("Givind");
this.dh.insert("Parth");
List<String> names = this.dh.SelectAll();
StringBuilder sb = new StringBuilder();
sb.append("Names in database:\n");
for(String name : names)
{
sb.append(name + "\n");
}
Log.d("EXAMPLE", "names size - " + names.size());
this.text_out.setText(sb.toString());
}
package.com.and.database.demo;
导入java.util.List;
导入com.and.database.helper.MyHelperActivity;
导入android.app.Activity;
导入android.os.Bundle;
导入android.util.Log;
导入android.widget.TextView;
公共类MyDatabaseActivity扩展了活动{
私有文本查看文本输出;
私人MyHelperActivity dh;
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text_out=(TextView)findViewById(R.id.textout);
this.dh=新的MyHelperActivity(this);
this.dh.deleteAll();
本dh.插入(“durgesh”);
本dh.插入(“Mukesh”);
本文件插入(“Sk”);
本dh.插入(“Givind”);
本dh.插入(“第方”);
List name=this.dh.SelectAll();
StringBuilder sb=新的StringBuilder();
sb.append(“数据库中的名称:\n”);
for(字符串名称:名称)
{
sb.追加(姓名+“\n”);
}
Log.d(“示例”,“名称大小-”+名称.size());
this.text_out.setText(sb.toString());
}
}
第二个文件助手类
package com.and.database.helper;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
public class MyHelperActivity {
private static final String DATABASE_NAME = "mydata.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "mytable";
private Context context;
private SQLiteStatement insertstm;
private SQLiteDatabase db;
private static final String INSERT ="insert into " + TABLE_NAME + " (name) values(?)";
public MyHelperActivity(Context context) {
this.context = context;
OpenHelper openHelper = new OpenHelper(this.context);
this.db = openHelper.getWritableDatabase();
this.insertstm = this.db.compileStatement(INSERT);
}
public long insert (String name){
this.insertstm.bindString(1, name);
return this.insertstm.executeInsert();
}
public void deleteAll() {
this.db.delete(TABLE_NAME , null, null);
}
public List<String> SelectAll(){
List<String>list = new ArrayList<String>();
Cursor cursor = this.db.query(TABLE_NAME, new String[]{"name"}, null, null, null, null,"name desc");
if (cursor.moveToFirst()) {
do {
list.add(cursor.getString(0));
}while(cursor.moveToNext());
}
if (cursor != null && cursor.isClosed()) {
cursor.close();
}
return list;
}
private static class OpenHelper extends SQLiteOpenHelper {
public OpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + " (id INTEGER PRIMARY KEY, name TEXT)");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w("Example", "Upgrading database, this will drop tables and recreate.");
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
package.com.and.database.helper;
导入java.util.ArrayList;
导入java.util.List;
导入android.content.Context;
导入android.database.Cursor;
导入android.database.sqlite.SQLiteDatabase;
导入android.database.sqlite.SQLiteOpenHelper;
导入android.database.sqlite.SQLiteStatement;
导入android.util.Log;
公共类MyHelperActivity{
私有静态最终字符串数据库\u NAME=“mydata.db”;
私有静态最终int数据库_VERSION=1;
私有静态最终字符串表\u NAME=“mytable”;
私人语境;
私有SQLiteStatement insertstm;
专用数据库数据库;
私有静态最终字符串INSERT=“插入到”+表_NAME+“(名称)值(?);
公共MyHelperActivity(上下文){
this.context=上下文;
OpenHelper OpenHelper=新的OpenHelper(this.context);
this.db=openHelper.getWritableDatabase();
this.insertstm=this.db.compileStatement(插入);
}
公共长插入(字符串名称){
this.insertstm.bindString(1,名称);
返回此.insertstm.executeInsert();
}
public void deleteAll(){
this.db.delete(表名称,null,null);
}
公共列表SelectAll(){
Listlist=新的ArrayList();
Cursor Cursor=this.db.query(表_NAME,新字符串[]{“NAME”},null,null,null,null,“NAME desc”);
if(cursor.moveToFirst()){
做{
list.add(cursor.getString(0));
}while(cursor.moveToNext());
}
if(cursor!=null&&cursor.isClosed()){
cursor.close();
}
退货清单;
}
私有静态类OpenHelper扩展了SQLiteOpenHelper{
公共OpenHelper(上下文){
super(上下文、数据库名称、null、数据库版本);
}
public void onCreate(SQLiteDatabase db){
db.execSQL(“创建表”+表名称+”(id整数主键,名称文本)”);
}
public void onUpgrade(SQLiteDatabase db,int-oldVersion,int-newVersion){
w(“示例”,“升级数据库,这将删除表并重新创建”);
db.execSQL(“如果存在删除表”+表名称);
onCreate(db);
}
}
}
以下错误生成贝洛夫
03-05 09:00:35.918: ERROR/AndroidRuntime(371): FATAL EXCEPTION: main
03-05 09:00:35.918: ERROR/AndroidRuntime(371): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.and.database.demo/com.and.database.demo.MyDatabaseActivity}: android.database.sqlite.SQLiteException: no such table: mytable: , while compiling: insert into mytable (name) values (?);
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.os.Looper.loop(Looper.java:123)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at java.lang.reflect.Method.invokeNative(Native Method)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at java.lang.reflect.Method.invoke(Method.java:521)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at dalvik.system.NativeStart.main(Native Method)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): Caused by: android.database.sqlite.SQLiteException: no such table: mytable: , while compiling: insert into mytable (name) values (?);
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:36)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1145)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at com.and.database.helper.MyHelperActivity.<init>(MyHelperActivity.java:29)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at com.and.database.demo.MyDatabaseActivity.onCreate(MyDatabaseActivity.java:19)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-05 09:00:35.918: ERROR/AndroidRuntime(371): ... 11 more
03-05 09:00:35.918:错误/AndroidRuntime(371):致命异常:主
03-05 09:00:35.918:错误/AndroidRuntime(371):java.lang.RuntimeException:无法启动活动组件信息{com.and.database.demo/com.and.database.demo.MyDatabaseActivity}:android.database.sqlite.SQLiteException:没有这样的表:mytable:,编译时:插入mytable(名称)值(?);
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.os.Handler.dispatchMessage(Handler.java:99)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在android.os.Looper.loop(Looper.java:123)上
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.app.ActivityThread.main(ActivityThread.java:4627)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于java.lang.reflect.Method.invokenactive(本机方法)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于java.lang.reflect.Method.invoke(Method.java:521)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在dalvik.system.NativeStart.main(本机方法)
03-05 09:00:35.918:错误/AndroidRuntime(371):原因:android.database.sqlite.SQLiteException:没有这样的表:mytable:,编译时:插入mytable(名称)值(?);
03-05 09:00:35.918:ERROR/AndroidRuntime(371):在android.database.sqlite.SQLiteCompiledSql.native_编译(本机方法)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.database.sqlite.SQLiteCompiledSql。(SQLiteCompiledSql.java:64)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:80)
03-05 09:00:35.918:ERROR/AndroidRuntime(371):位于android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:36)
03-05 09:00:35.918:错误/AndroidRuntime(371):
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + " (id INTEGER PRIMARY KEY, name TEXT)");
}