E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dell.kaoqin, PID: 3408
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dell.kaoqin/com.example.dell.kaoqin.Main2Activity}: android.database.sqlite.SQLiteException: no such column: id (code 1): , while compiling: select * from kaoqin where id=?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: android.database.sqlite.SQLiteException: no such column: id (code 1): , while compiling: select * from kaoqin where id=?
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.SQLiteQuery.< init >(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1318)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1257)
at com.example.dell.kaoqin.Dao.queryday(Dao.java:87)
at com.example.dell.kaoqin.Main2Activity.onCreate(Main2Activity.java:30)
at android.app.Activity.performCreate(Activity.java:6664)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
代码如下
package com.example.dell.kaoqin;
import android.app.AlertDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private EditText id,password;
private Button btns,btnt;
private Dao dao;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dao=new Dao(MainActivity.this);
init();
btns.setOnClickListener(studentlistener);
btnt.setOnClickListener(teacherlistener);
}
public void init(){
id= (EditText) findViewById(R.id.id2);
password= (EditText) findViewById(R.id.password2);
btns= (Button) findViewById(R.id.btn_student);
btnt= (Button) findViewById(R.id.btn_teacher);
}
View.OnClickListener studentlistener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (dao.isboolean(Integer.parseInt(id.getText().toString()),password.getText().toString())){
Intent intent=new Intent(MainActivity.this,Main2Activity.class);
Bundle bundle=new Bundle();
bundle.putString("id",id.getText().toString());
intent.putExtras(bundle);
startActivityForResult(intent,1);
id.setText("");
password.setText("");
Toast.makeText(MainActivity.this,"登录成功！",Toast.LENGTH_LONG).show();
}else if (id.getText().toString()==null||password.getText().toString()==null){
Toast.makeText(MainActivity.this,"错误！",Toast.LENGTH_LONG).show();
}else
Toast.makeText(MainActivity.this,"账号或密码错误！",Toast.LENGTH_LONG).show();
}
};
View.OnClickListener teacherlistener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (id.getText().toString().equals("aidi")&&password.getText().toString().equals("123")) {
Intent intent = new Intent(MainActivity.this, Main22Activity.class);
startActivity(intent);
Toast.makeText(MainActivity.this,"登录成功！",Toast.LENGTH_LONG).show();
}else
Toast.makeText(MainActivity.this,"账号或密码错误！",Toast.LENGTH_LONG).show();
}
};
}
import java.util.ArrayList;
import java.util.List;
/**
* Created by dell on 2017/6/12.
*/
public class Dao {
private help helper;
public Dao(Context context) {
helper=new help(context);
}
//老师插入学生考勤情况
public void insertteacher(student student){
SQLiteDatabase db=helper.getReadableDatabase();
ContentValues values=new ContentValues();
values.put("id",student.getId());
values.put("day",student.getKecheng());
values.put("kecheng",student.getKecheng());
values.put("kaoqin",student.getKaoqin());
Log.i("test",student.getKecheng());
db.insert("kaoqin",null,values);
}
//插入学生信息
public void insertstudent(int id,String password){
SQLiteDatabase db=helper.getReadableDatabase();
ContentValues values=new ContentValues();
values.put("id",id);
values.put("password",password);
db.insert("denglu",null,values);
Log.i("test","添加信息");
db.close();
}
//删除学生信息
public void delete(student student){
SQLiteDatabase db=helper.getReadableDatabase();
db.delete("denglu","id=?",new String[]{student.getId()+""});
db.close();
}
//老师修改学生考勤情况
public void update(student student){
SQLiteDatabase db=helper.getReadableDatabase();
ContentValues values=new ContentValues();
values.put("id",student.getId());
values.put("day",student.getDay());
values.put("kecheng",student.getKecheng());
values.put("kaoqin",student.getKaoqin());
db.update("kaoqin",values,"id=?",new String[]{student.getId()+""});
db.close();
}
//判断学号密码是否正确
public boolean isboolean(int id,String password){
SQLiteDatabase db=helper.getReadableDatabase();
Cursor c=db.rawQuery("select * from denglu where password=? and id=?",new String[]{password,id+""});
boolean b=c.moveToFirst();
Log.i("test",b+"");
return b;
}
//查看考勤情况
public ArrayList< student > query(int id){
ArrayList< student >list=new ArrayList< >();
SQLiteDatabase db=helper.getReadableDatabase();
Cursor c=db.rawQuery("select * from kaoqin where id=?",new String[]{id+""});
while (c.moveToNext()){
int i=c.getInt(0);
String day=c.getString(1);
String kecheng=c.getString(2);
String kaoqin=c.getString(3);
list.add(new student(i,day,kecheng,kaoqin));
}
db.close();
return list;
}
//调用学生考勤日期
public ArrayList< String >queryday(int id){
ArrayList< String >day=new ArrayList< >();
SQLiteDatabase db=helper.getReadableDatabase();
Cursor c=db.rawQuery("select * from kaoqin where id=?",new String[]{id+""});
while (c.moveToNext()){
day.add(c.getString(1));
Log.i("test",c.getString(1)+"");
}
return day;
}
}
数据库：
public class help extends SQLiteOpenHelper {
public help(Context context) {
super(context, "shuju", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table denglu(id integer,password)");
db.execSQL("create table kaoqin(int id,day,kecheng,kaoqin)");
Log.i("test","声明数据库");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
@Override
public void onOpen(SQLiteDatabase db) {
super.onOpen(db);
}
}
回复讨论(解决方案)
kaoqin表的id是string类型？ 没有设置类型 没有设置类型是什么鬼，数据库中的字段难道没有类型吗？ no such column id 没有id这个字段 个人觉得，应该是sql语句写的有点问题，导致数据库识别不到，请楼主仔细检查。安卓手写sqlit数据库太麻烦，不如用郭霖的litepal三方数据库，简单直接 找到问题了，我user表是后添加的，没有更新数据库，所以根本就没有user这个表。。。。
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