java - 在android中的textview中显示来自sqlite数据库的数据

Question

我正在尝试在android中的数据库中显示 TextView 中的数据，但它显示运行时错误..我正在创建数据库文件..

package com.example.databasetest;


import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.provider.BaseColumns;
import android.util.Log;

public class DBHelper extends SQLiteOpenHelper{

    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "teacher";
    private static final String TABLE_NAME = "teacher_table";

    private static final String NAME = "teacher_name";
    private static final String FATHER_NAME = "father_name";
    private static final String MOTHER_NAME = "mother_name";

    SQLiteDatabase data=this.getWritableDatabase();

    Context ctx;



    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        ctx=context;
        Log.d("DATABASE OPERATION", "DATABASE CREATED");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        data=db;
          db.execSQL("CREATE TABLE " + TABLE_NAME + " ("
                    + BaseColumns._ID + " id INTEGER PRIMARY KEY AUTOINCREMENT, "
                    + NAME + " TEXT,"
                    + FATHER_NAME + " TEXT,"
                    + MOTHER_NAME + " TEXT,"
                    + ");");
        Log.d("DATABASE OPERATION", "TABLE CREATED");


    }
     public void open() throws SQLException
     {
         DBHelper db1 = new DBHelper(ctx);
            data = db1.getWritableDatabase();
     }

     public void close()
     {
         data.close();
     }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXCEPTION EXISTS");
        onCreate(db);       
    }
    public void onInsert(DBHelper db,String name,String f_name, String m_name)
    {
        SQLiteDatabase sql= db.getWritableDatabase();
        ContentValues cv=new ContentValues();
        cv.put("teacher_name",name);
        cv.put("father_name", f_name);
        cv.put("mother_name", m_name);
        sql.insert(TABLE_NAME, null, cv);
        Log.d("DATABASE OPERATION", "ONE ROW INSERTED.....");
    }

    public Cursor getInformation(DBHelper dop)
    {
        SQLiteDatabase SQ=dop.getReadableDatabase();
        String[] coloumns={NAME,FATHER_NAME,MOTHER_NAME};
        Cursor CR=SQ.query(TABLE_NAME, coloumns, null, null, null, null, null);
        return CR;

    }


}

和java文件...

package com.example.databasetest;



import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.TextView;

public class ShowDetail extends Activity{
    TextView NAME,FATHERNAME,MOTHERNAME;
    String name,fathername,mothername;
    Context ctxx=this;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.show_data);
        NAME=(TextView)findViewById(R.id.name);
        FATHERNAME=(TextView)findViewById(R.id.father_name);
        MOTHERNAME=(TextView)findViewById(R.id.mother_name);
         List<String> list = new ArrayList<String>();
        DBHelper DB= new DBHelper(ctxx);
        DB.open();
        Cursor CR=DB.getInformation(DB);
        if (CR.moveToFirst()) {
         do {

             list.add(CR.getString(0));

             name=CR.getString(0);

             fathername=CR.getString(1);

             mothername=CR.getString(2);



         } while (CR.moveToNext());
      }
      if (CR != null && !CR.isClosed()) {
         CR.close();
      }
      if(DB!=null)
      {
          DB.close();
      }

      NAME.setText(name);
      FATHERNAME.setText(fathername);
      MOTHERNAME.setText(mothername);


    }
}

并且日志 cate 显示错误为......

05-07 06:25:59.173: D/gralloc_goldfish(918): Emulator without GPU emulation detected.
05-07 06:26:15.483: E/SQLiteLog(918): (1) AUTOINCREMENT is only allowed on an INTEGER PRIMARY KEY
05-07 06:26:15.483: D/AndroidRuntime(918): Shutting down VM
05-07 06:26:15.483: W/dalvikvm(918): threadid=1: thread exiting with uncaught exception (group=0x41465700)
05-07 06:26:15.553: E/AndroidRuntime(918): FATAL EXCEPTION: main
05-07 06:26:15.553: E/AndroidRuntime(918): android.database.sqlite.SQLiteException: AUTOINCREMENT is only allowed on an INTEGER PRIMARY KEY (code 1): , while compiling: CREATE TABLE teacher_table (_id id INTEGER PRIMARY KEY AUTOINCREMENT, teacher_name TEXT,father_name TEXT,mother_name TEXT,);
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603)
05-07 06:26:15.553: E/AndroidRuntime(918):  at com.example.databasetest.DBHelper.onCreate(DBHelper.java:38)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
05-07 06:26:15.553: E/AndroidRuntime(918):  at com.example.databasetest.DBHelper.<init>(DBHelper.java:23)
05-07 06:26:15.553: E/AndroidRuntime(918):  at com.example.databasetest.MainActivity$1.onClick(MainActivity.java:46)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.view.View.performClick(View.java:4240)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.view.View$PerformClick.run(View.java:17721)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.os.Handler.handleCallback(Handler.java:730)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.os.Handler.dispatchMessage(Handler.java:92)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.os.Looper.loop(Looper.java:137)
05-07 06:26:15.553: E/AndroidRuntime(918):  at android.app.ActivityThread.main(ActivityThread.java:5103)
05-07 06:26:15.553: E/AndroidRuntime(918):  at java.lang.reflect.Method.invokeNative(Native Method)
05-07 06:26:15.553: E/AndroidRuntime(918):  at java.lang.reflect.Method.invoke(Method.java:525)
05-07 06:26:15.553: E/AndroidRuntime(918):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-07 06:26:15.553: E/AndroidRuntime(918):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-07 06:26:15.553: E/AndroidRuntime(918):  at dalvik.system.NativeStart.main(Native Method)

请帮我修复错误

Answer 1

您的创建表sql命令是错误的。更正如下

 db.execSQL("CREATE TABLE " + TABLE_NAME + " ("
                + BaseColumns._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + NAME + " TEXT,"
                + FATHER_NAME + " TEXT,"
                + MOTHER_NAME + " TEXT"
                + ");");