如何显示，选择，编辑和删除ListView，在SQLite数据库（Java Android应用程序）的3列上存储3个编辑文本

时间：2018-02-07 06:30:07

标签： java android listview android-sqlite

我正在尝试构建一个应用程序，用户将在3个编辑文本中输入3个数据，然后将其存储到数据库中的3列。用户在列表视图上显示它们，允许它们选择整个项目来编辑其中一个文本字段或整个删除整个项目。到目前为止，向数据库添加数据仍然有效，它存储在3个不同的列中。至于显示，它只显示第一个编辑文本，它是数据库中BodyTemp的第一列数据，当我尝试选择项目时整个应用程序崩溃。

ViewRecords.java 

package mdad.project;
import java.util.ArrayList;
import com.example.manandhowproject.R;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class ViewRecords extends Activity {
    DatabaseHelper dbhelper;
    ListView listView;

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

        dbhelper = new DatabaseHelper(this);
        listView = (ListView) findViewById(R.id.listView);
        populateListView();
    }

    private void populateListView()
    {
        Cursor records = dbhelper.getRecords();
        ArrayList<String> listRec = new ArrayList<String>();
        while(records.moveToNext()){
            listRec.add(records.getString(1));
        }
    ListAdapter adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,listRec);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
             String BTemp = adapterView.getItemAtPosition(i).toString();
             String HRate = adapterView.getItemAtPosition(i).toString();
             String Bmi = adapterView.getItemAtPosition(i).toString();

             Cursor data = dbhelper.getRecID(BTemp, HRate, Bmi);
             int recID = -1;
             while(data.moveToNext()){
                 recID = data.getInt(0);
             }
             if(recID > -1){

                 Intent editScreenIntent = new Intent(ViewRecords.this, EditDel.class);
                 editScreenIntent.putExtra("id",recID);
                 editScreenIntent.putExtra("Body Temperature",BTemp);
                 editScreenIntent.putExtra("Heart Rate",HRate);
                 editScreenIntent.putExtra("BMI",Bmi);
                 startActivity(editScreenIntent);
             }
             else{
                 Toast.makeText(getApplicationContext(), "No ID Associated", Toast.LENGTH_LONG).show();
             }
         }
     });
 }}

DatabaseHelper.java 

package mdad.project;

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

public class DatabaseHelper extends SQLiteOpenHelper {

        public static final String DATABASE_NAME = "medrec.db";
        public static final String TABLE_NAME = "myrec_data";
        public static final String COL1 = "ID";
        public static final String COL2 = "BodyTemp";
        public static final String COL3 = "HeartRate";
        public static final String COL4 = "BMI";



     public DatabaseHelper(Context context) {
            super(context, TABLE_NAME, null, 1);
        }

    @Override
    public void onCreate(SQLiteDatabase db) {

    String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " + COL2 + " TEXT, " + COL3 + " TEXT, " + COL4 + " TEXT);";
    db.execSQL(createTable);

    }

    @Override
    public void onUpgrade (SQLiteDatabase db,int i, int i1)
    {
         db.execSQL("DROP IF TABLE EXISTS " + TABLE_NAME);
         onCreate(db);
    }

     public boolean addRecord(String BodyTemp, String HeartRate, String BMI) {
            SQLiteDatabase db = this.getWritableDatabase();
            ContentValues contentValues = new ContentValues();
            contentValues.put(COL2, BodyTemp);
            contentValues.put(COL3, HeartRate);
            contentValues.put(COL4, BMI);

            long result = db.insert(TABLE_NAME, null, contentValues);


            if (result == -1) {
                return false;
            } else {
                return true;
            }
        }


     public Cursor getRecords()
     {
         SQLiteDatabase db = this.getWritableDatabase();
         String query = "SELECT * FROM " + TABLE_NAME;
         Cursor records = db.rawQuery(query, null);
         return records;
     }

     public Cursor getRecID(String BTemp, String Hrate, String Bmi){
            SQLiteDatabase db = this.getWritableDatabase();
            String query = "SELECT " + COL1 + " FROM " + TABLE_NAME +
                    " WHERE " + COL2 + " = '" + BTemp + "AND" + COL3 + " = '" + Hrate + "AND" + COL4 + " = '" + Bmi +"'";
            Cursor data = db.rawQuery(query, null);
            return data;
        }

    public void updateBtemp(String bodytemp, int selectedID,
            String selectedBtemp) {
          SQLiteDatabase db = this.getWritableDatabase();
          String query = "UPDATE " + TABLE_NAME + " SET " + COL2 +
                    " = '" + bodytemp + "' WHERE " + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL2 + " = '" + selectedBtemp + "'";
            db.execSQL(query);

    }

    public void updateHrate(String heartrate, int selectedID,
            String selectedHrate) {
        SQLiteDatabase db = this.getWritableDatabase();
          String query = "UPDATE " + TABLE_NAME + " SET " + COL3 +
                    " = '" + heartrate + "' WHERE " + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL3 + " = '" + selectedHrate + "'";
            db.execSQL(query);

    }

    public void updateBMI(String bmi, int selectedID, String selectedBMI) {
        SQLiteDatabase db = this.getWritableDatabase();
          String query = "UPDATE " + TABLE_NAME + " SET " + COL4 +
                    " = '" + bmi + "' WHERE " + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL4 + " = '" + selectedBMI + "'";
            db.execSQL(query);

    }

    public void deleteBtemp(int selectedID, String selectedBtemp) {
           SQLiteDatabase db = this.getWritableDatabase();
            String query = "DELETE FROM " + TABLE_NAME + " WHERE "
                    + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL2 + " = '" + selectedBtemp + "'";

            db.execSQL(query);

    }

    public void deleteHrate(int selectedID, String selectedHrate) {
           SQLiteDatabase db = this.getWritableDatabase();
            String query = "DELETE FROM " + TABLE_NAME + " WHERE "
                    + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL3 + " = '" + selectedHrate + "'";

            db.execSQL(query);

    }

    public void deleteBMI(int selectedID, String selectedBMI) {
           SQLiteDatabase db = this.getWritableDatabase();
            String query = "DELETE FROM " + TABLE_NAME + " WHERE "
                    + COL1 + " = '" + selectedID + "'" +
                    " AND " + COL4 + " = '" + selectedBMI + "'";

            db.execSQL(query);

    }

}

EditDel.java 

package mdad.project;
import com.example.manandhowproject.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class EditDel extends Activity {

    Button btnSave,btnDelete;
    EditText etBT, etHR, etBMI;

    DatabaseHelper dbhelper;

    private String selectedBtemp, selectedHrate, selectedBMI;
    private int selectedID;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.editdel);
        btnSave = (Button) findViewById(R.id.btnSave);
        btnDelete = (Button) findViewById(R.id.btnDelete);
        etBT = (EditText) findViewById(R.id.etBT);
        etHR = (EditText) findViewById(R.id.etHR);
        etBMI = (EditText) findViewById(R.id.etBMI);
        dbhelper = new DatabaseHelper(this);


        Intent receivedIntent = getIntent();


        selectedID = receivedIntent.getIntExtra("id",-1); 
        selectedBtemp = receivedIntent.getStringExtra("BTemp");
        selectedHrate = receivedIntent.getStringExtra("Hrate");
        selectedBMI = receivedIntent.getStringExtra("Bmi");



        etBT.setText(selectedBtemp);
        etHR.setText(selectedHrate);
        etBMI.setText(selectedBMI);

        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String bodytemp = etBT.getText().toString();
                String heartrate = etHR.getText().toString();
                String bmi = etBMI.getText().toString();
                if(!bodytemp.equals("") && !heartrate.equals("") && !bmi.equals("")){
                    dbhelper.updateBtemp(bodytemp,selectedID,selectedBtemp);
                    dbhelper.updateHrate(heartrate,selectedID,selectedHrate);
                    dbhelper.updateBMI(bmi,selectedID,selectedBMI);

                }else{
                    toastMessage("Please ensure all fields are filled.");
                }
            }
        });

        btnDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               dbhelper.deleteBtemp(selectedID,selectedBtemp);
               dbhelper.deleteHrate(selectedID,selectedHrate);
               dbhelper.deleteBMI(selectedID,selectedBMI);
                etBT.setText("");
                etHR.setText("");
                etBMI.setText("");
                toastMessage("removed from database");
            }
        });

    }

    /**
     * customizable toast
     * @param message
     */
    private void toastMessage(String message){
        Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
    }
}

崩溃日志

02-07 01:14:44.373: E/AndroidRuntime(17899): FATAL EXCEPTION: main
02-07 01:14:44.373: E/AndroidRuntime(17899): android.database.sqlite.SQLiteException: unrecognized token: "666666ANDBMI" (code 1): , while compiling: SELECT ID FROM myrec_data WHERE BodyTemp = '666666ANDHeartRate = '666666ANDBMI = '666666'
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at mdad.project.DatabaseHelper.getRecID(DatabaseHelper.java:69)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at mdad.project.ViewRecords$1.onItemClick(ViewRecords.java:47)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.widget.AdapterView.performItemClick(AdapterView.java:298)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.widget.AbsListView$1.run(AbsListView.java:3463)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.os.Handler.handleCallback(Handler.java:730)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.os.Looper.loop(Looper.java:137)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at android.app.ActivityThread.main(ActivityThread.java:5103)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at java.lang.reflect.Method.invokeNative(Native Method)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at java.lang.reflect.Method.invoke(Method.java:525)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-07 01:14:44.373: E/AndroidRuntime(17899):    at dalvik.system.NativeStart.main(Native Method)

1 个答案:

答案 0 :(得分：1)

您需要在sql中添加一些引号和空格

这

WHERE " + COL2 + " = '" + BTemp + "AND" ...

到

WHERE " + COL2 + " = '" + BTemp + "' AND " ....

虽然最好使用JDBC或JPA并使用set方法

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