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解決，艾哈邁德後的溶液，改變錯誤的語法，增加數據庫版本/或重新安裝SQlite的列不存在
我看到了有關這一問題的許多議題，但我不能確定我的代碼。 有兩個類：Main和DatabaseHandler。 用於創建數據庫表（名稱，辦公室，照片，promisses，陳述，活動） 但是，上一個colume「活動」不會被識別並引發錯誤： 「SQLite返回：錯誤代碼= 1，msg =表候選人有沒有列名爲活動「
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "ElectionCandidates";
// Candidates table name
private static final String TABLE_CANDIDATES = "candidates";
// Candidates Table Columns names
private static final String KEY_NAME = "name";
private static final String KEY_OFFICE = "office";
private static final String KEY_PHOTO = "photograph";
private static final String KEY_PROMISSES = "promisses";
private static final String KEY_STATMENT = "statment";
private static final String KEY_ACTIVE = "active";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CANDIDATES_TABLE = "CREATE TABLE " + TABLE_CANDIDATES
+ "(" + KEY_NAME + " TEXT," + KEY_OFFICE + " TEXT," + KEY_PHOTO
+ " TEXT" + KEY_PROMISSES + " TEXT" + KEY_STATMENT + " TEXT"
+ KEY_ACTIVE + " TEXT" + ")";
db.execSQL(CREATE_CANDIDATES_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CANDIDATES);
// Create tables again
onCreate(db);
}
void addCandidate(Candidate candidate) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, candidate.get_name()); // Candidate Name
values.put(KEY_OFFICE, candidate.get_office()); // Candidate Phone
values.put(KEY_PHOTO, candidate.get_photograph());
values.put(KEY_PROMISSES, candidate.get_promisses());
values.put(KEY_STATMENT, candidate.get_statment());
values.put(KEY_ACTIVE, 1);
// Inserting Row
db.insert(TABLE_CANDIDATES, null, values);
db.close(); // Closing database connection
}
Candidate getCandidate(String name) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CANDIDATES,
new String[] { KEY_NAME, KEY_OFFICE, KEY_PHOTO, KEY_PROMISSES,
KEY_STATMENT, KEY_ACTIVE }, KEY_NAME + "=?",
new String[] { String.valueOf(name) }, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Candidate candidate = new Candidate(cursor.getString(0),
cursor.getString(1), cursor.getString(2), cursor.getString(3),
cursor.getString(4), Integer.parseInt(cursor.getString(5)));
// return candidate
return candidate;
}
public List<Candidate> getAllCandidates() {
List<Candidate> candidateList = new ArrayList<Candidate>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CANDIDATES;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Candidate candidate = new Candidate();
candidate.set_name(cursor.getString(0));
candidate.set_office(cursor.getString(1));
candidate.set_photograph(cursor.getString(2));
candidate.set_promisses(cursor.getString(3));
candidate.set_statment(cursor.getString(4));
candidate.set_active(Integer.parseInt(cursor.getString(5)));
// Adding candidate to list
candidateList.add(candidate);
} while (cursor.moveToNext());
}
// return candidate list
return candidateList;
}
public int updateCandidate(Candidate candidate) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, candidate.get_name()); // Candidate Name
values.put(KEY_OFFICE, candidate.get_office()); // Candidate Phone
values.put(KEY_PHOTO, candidate.get_photograph());
values.put(KEY_PROMISSES, candidate.get_promisses());
values.put(KEY_STATMENT, candidate.get_statment());
values.put(KEY_ACTIVE, candidate.get_active());
// updating row
return db.update(TABLE_CANDIDATES, values, KEY_NAME + " = ?",
new String[] { String.valueOf(candidate.get_name()) });
}
// Deleting single candidate
public void deleteCandidate(Candidate candidate) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CANDIDATES, KEY_NAME + " = ?",
new String[] { String.valueOf(candidate.get_name()) });
db.close();
}
// Getting candidates Count
public int getCandidatesCount() {
String countQuery = "SELECT * FROM " + TABLE_CANDIDATES;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
package com.s1042512.electionvoter;
import java.util.List;
import com.s1042512.electionvoter.Candidate;
import com.s1042512.electionvoter.DatabaseHandler;
import com.s1042512.electionvoter.R;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DatabaseHandler db = new DatabaseHandler(this);
/**
* CRUD Operations
* */
// Inserting Candidates
Log.d("Insert: ", "Inserting ..");
db.addCandidate(new Candidate("Scott Web", "Vice President", "Uglyface", "Promice To suck", "I am noob",0));
db.addCandidate(new Candidate("Nyash Rush", "President", "Kavaiiii", "Promice To kill", "I am pro",1));
// Reading all candidates
Log.d("Reading: ", "Reading all candidates..");
List<Candidate> candidates = db.getAllCandidates();
for (Candidate cn : candidates) {
String log = "Name: "+cn.get_name()+" ,Office: " + cn.get_office() + " , Photo: " + cn.get_photograph()
+ " , Promisses: " + cn.get_promisses()+ " , Statment: " + cn.get_statment();
// Writing Candidates to log
Log.d("Name: ", log);
}
}
}
'+「TEXT」'你在填寫固定代碼後缺少空格，逗號或者那個 – zapl