Question

我在sqlite数据库中创建了3个表，即表1）学院（栏目： - college_id，college_name，college_address，city，state，pincode，phone_number，rating，principal，email，website）
表2）课程（栏目： - course_id，course_name，course_description，course_stream，duration，rating）＆amp;
表3）CollegeCourse（列： - collegecourse_id，college_id，course_id，effsective_start_date，effective_end_date，effective_flag）。

我无法从SQLite数据库中检索数据，在列表视图中显示数据，过滤列表视图，以及在单击项目时显示详细信息。

示例： - http://imageshack.com/a/img633/7490/a58U0S.png

布局：

    <EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="Type college name to filter..." >

    <requestFocus />
    </EditText>

    <ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    </ListView>

    </LinearLayout>

MainActivity.java：

package com.android.collegefinder;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{

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

        Button b = (Button) findViewById(R.id.searchcollegebtn);
        b.setOnClickListener(this);

        CollegeTable db = new CollegeTable(this);

        db.addCollege(new College(1, "Smt. Chandibai Himathmal Mansukhani College", "Opp. Railway Station, Smt.Chandibai Himathmal Mansukhani road", "Ulhasnagar", "Maharashtra", "421003", "02512734940", "B++", "Dr. Charanjit Kaur Singh", "principalchmc@gmail.com", "www.chm.edu"));
    db.getAllColleges();

    db.addCourse(new Course(1, "Economics", "N/A", "Arts", "3", 0));
    db.getAllCourses();

    db.addCollegeCourse(new CollegeCourse(1, 1, 1, "2015-01-01 00:00:00.000", "9999-01-01 00:00:00.000", 1));
    db.getAllCollegeCourse();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onClick(View v) {
    if(v.getId() == R.id.searchcollegebtn) {
        startActivity(new Intent(MainActivity.this, SearchCollege.class));
    }
}
}

DBHandler： -

    package com.android.collegefinder;

import java.util.LinkedList;
import java.util.List;

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

public class CollegeTable extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "CollegeFinder";

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

@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_COLLEGE_TABLE = "CREATE TABLE College ( " + 
    "college_id INTEGER PRIMARY KEY, " + "college_name TEXT, " + "college_address TEXT, " + "city TEXT, " + "state TEXT, " + 
    "pincode TEXT, " + "phone_number TEXT, " + "college_rating TEXT, " + "principal TEXT, " + "email TEXT, " + "website TEXT )";

    String CREATE_COURSE_TABLE = "CREATE TABLE Course ( " + 
    "course_id INTEGER PRIMARY KEY, " + "course_name TEXT, " + "course_description TEXT, " + "course_stream TEXT, " + 
    "duration TEXT, " + "course_rating REAL )";

    String CREATE_COLLEGECOURSE_TABLE = "CREATE TABLE CollegeCourse ( " +
    "collegecourse_id INTEGER PRIMARY KEY, " + "college_id INTEGER, " + "course_id INTEGER, " + "effective_start_date TEXT, " + "effective_end_date TEXT," + "effective_flag INTEGER )";

    db.execSQL(CREATE_COLLEGE_TABLE);
    db.execSQL(CREATE_COURSE_TABLE);
    db.execSQL(CREATE_COLLEGECOURSE_TABLE);

}


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

    this.onCreate(db);
}

private static final String TABLE_COLLEGE = "College";
private static final String KEY_COLLEGE_ID = "college_id";
private static final String KEY_COLLEGE_NAME = "college_name";
private static final String KEY_COLLEGE_ADDRESS = "college_address";
private static final String KEY_CITY = "city";
private static final String KEY_STATE = "state";
private static final String KEY_PINCODE = "pincode";
private static final String KEY_PHONE_NUMBER = "phone_number";
private static final String KEY_COLLEGE_RATING = "college_rating";
private static final String KEY_PRINCIPAL = "principal";
private static final String KEY_EMAIL = "email";
private static final String KEY_WEBSITE = "website";

private static final String[] COLUMNS = {KEY_COLLEGE_ID,KEY_COLLEGE_NAME,KEY_COLLEGE_ADDRESS,KEY_CITY,KEY_STATE,KEY_PINCODE,KEY_PHONE_NUMBER,KEY_COLLEGE_RATING,KEY_PRINCIPAL,KEY_EMAIL,KEY_WEBSITE};

public void addCollege(College college){
    Log.d("addCollege", college.toString());

    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_COLLEGE_ID, college.getCollegeId());
    values.put(KEY_COLLEGE_NAME, college.getCollegeName());
    values.put(KEY_COLLEGE_ADDRESS, college.getCollegeAddress());
    values.put(KEY_CITY, college.getCity());
    values.put(KEY_STATE, college.getState());
    values.put(KEY_PINCODE, college.getPincode());
    values.put(KEY_PHONE_NUMBER, college.getPhoneNumber());
    values.put(KEY_COLLEGE_RATING, college.getCollegeRating());
    values.put(KEY_PRINCIPAL, college.getPrincipal());
    values.put(KEY_EMAIL, college.getEmail());
    values.put(KEY_WEBSITE, college.getWebsite());

    db.insert(TABLE_COLLEGE, null, values);

    db.close();
}


//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//COURSE TABLE  


private static final String TABLE_COURSE = "Course";
private static final String KEY_COURSE_ID = "course_id";
private static final String KEY_COURSE_NAME = "course_name";
private static final String KEY_COURSE_DESCRIPTION = "course_description";
private static final String KEY_COURSE_STREAM = "course_stream";
private static final String KEY_DURATION = "duration";
private static final String KEY_COURSE_RATING = "course_rating";

private static final String[] COLUMNS_COURSE = {KEY_COURSE_ID, KEY_COURSE_NAME, KEY_COURSE_DESCRIPTION, KEY_COURSE_STREAM, KEY_DURATION, KEY_COURSE_RATING};

public void addCourse(Course course){
    Log.d("addCourse", course.toString());

    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();

    values.put(KEY_COURSE_ID, course.getCourseId());
    values.put(KEY_COURSE_NAME, course.getCourseName());
    values.put(KEY_COURSE_DESCRIPTION, course.getCourseDescription());
    values.put(KEY_COURSE_STREAM, course.getCourseStream());
    values.put(KEY_DURATION, course.getDuration());
    values.put(KEY_COURSE_RATING, course.getCourseRating());

    db.insert(TABLE_COURSE, null, values);

    db.close();

}
//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// college course table

    private static final String TABLE_COLLEGECOURSE = "CollegeCourse";
    private static final String KEY_COLLEGECOURSE_ID = "collegecourse_id";
    private static final String KEY_COLLEGE_ID1 = "college_id";
    private static final String KEY_COURSE_ID1 = "course_id";
    private static final String KEY_EFFECTIVE_START_DATE = "effective_start_date";
    private static final String KEY_EFFECTIVE_END_DATE = "effective_end_date";
    private static final String KEY_EFFECTIVE_FLAG = "effective_flag";

    private static final String[] COLUMNS_COLLEGECOURSE = {KEY_COLLEGECOURSE_ID,KEY_COLLEGE_ID1,KEY_COURSE_ID1,KEY_EFFECTIVE_START_DATE,KEY_EFFECTIVE_END_DATE,KEY_EFFECTIVE_FLAG};

    public void addCollegeCourse(CollegeCourse collegecourse){

        Log.d("addCollegeCourse", collegecourse.toString());

        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(KEY_COLLEGECOURSE_ID, collegecourse.getCollegeCourseId());
        values.put(KEY_COLLEGE_ID1, collegecourse.getCollegeId());
        values.put(KEY_COURSE_ID1, collegecourse.getCourseId());
        values.put(KEY_EFFECTIVE_START_DATE, collegecourse.getEffectiveStartDate());
        values.put(KEY_EFFECTIVE_END_DATE, collegecourse.getEffectiveEndDate());
        values.put(KEY_EFFECTIVE_FLAG, collegecourse.getEffectiveFlag());

        db.insert(TABLE_COLLEGECOURSE, null, values);
        db.close();

    }

SearchCollege.java： -

    package com.android.collegefinder;

import android.app.Activity;
import android.os.Bundle;

public class SearchCollege extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.searchcollege);
    }
}

如何从sqlite数据库中检索数据并在listview中填充它？

0 个答案: