Java SQlite列不存在
已解决,Ahmad post中的解决方案,更改错误语法并增加数据库版本/或重新安装 我看到了很多关于这个问题的话题,但我无法修复我的代码。 有两个类:Main和DatabaseHandler。 创建数据库表的目的(名称、办公室、照片、承诺、状态、活动) 但是,无法识别最后一列“活动”,并抛出错误: SQLite返回:错误代码=1,msg=表候选项没有名为active的列Java SQlite列不存在,java,android,sqlite,Java,Android,Sqlite,已解决,Ahmad post中的解决方案,更改错误语法并增加数据库版本/或重新安装 我看到了很多关于这个问题的话题,但我无法修复我的代码。 有两个类:Main和DatabaseHandler。 创建数据库表的目的(名称、办公室、照片、承诺、状态、活动) 但是,无法识别最后一列“活动”,并抛出错误: SQLite返回:错误代码=1,msg=表候选项没有名为active的列 公共类DatabaseHandler扩展了SQLiteOpenHelper{ //所有静态变量 //数据库版本 私有静态最终i
公共类DatabaseHandler扩展了SQLiteOpenHelper{
//所有静态变量
//数据库版本
私有静态最终int数据库_VERSION=1;
//数据库名称
私有静态最终字符串数据库\u NAME=“ElectionCandidates”;
//候选表名
私有静态最终字符串表_CANDIDATES=“CANDIDATES”;
//候选表列名称
私有静态最终字符串键\u NAME=“NAME”;
私有静态最终字符串密钥\u OFFICE=“OFFICE”;
专用静态最终字符串键\u PHOTO=“PHOTO”;
私有静态最终字符串密钥\u PROMISSES=“PROMISSES”;
私有静态最终字符串密钥_station=“STATMENT”;
私有静态最终字符串键\u ACTIVE=“ACTIVE”;
公共数据库处理程序(上下文){
super(上下文、数据库名称、null、数据库版本);
}
@凌驾
public void onCreate(SQLiteDatabase db){
字符串CREATE_CANDIDATES_TABLE=“CREATE TABLE”+TABLE_CANDIDATES
+(“+钥匙名称+”文字“+钥匙办公室+”文字“+钥匙照片
+“文本”+关键承诺+“文本”+关键承诺+“文本”
+键_ACTIVE+“TEXT”+”;
execSQL(创建候选表);
}
@凌驾
public void onUpgrade(SQLiteDatabase db,int-oldVersion,int-newVersion){
//删除旧表(如果存在)
db.execSQL(“如果存在删除表”+表_);
//再次创建表
onCreate(db);
}
无效添加候选人(候选人){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues=新的ContentValues();
value.put(KEY_NAME,candidate.get_NAME());//candidate NAME
value.put(KEY_OFFICE,candidate.get_OFFICE());//候选电话
value.put(KEY_PHOTO,candidate.get_PHOTO());
value.put(KEY_PROMISSES,candidate.get_PROMISSES());
value.put(KEY_station,candidate.get_station());
值。put(键_激活,1);
//插入行
db.insert(表_候选者,空,值);
db.close();//关闭数据库连接
}
候选getCandidate(字符串名称){
SQLiteDatabase db=this.getReadableDatabase();
Cursor=db.query(表,
新字符串[]{KEY_NAME,KEY_OFFICE,KEY_PHOTO,KEY_PROMISSES,
按键状态,按键激活},按键名称+“=?”,
新字符串[]{String.valueOf(name)},null,null,null);
如果(光标!=null)
cursor.moveToFirst();
候选对象=新候选对象(cursor.getString(0),
cursor.getString(1)、cursor.getString(2)、cursor.getString(3),
cursor.getString(4)、Integer.parseInt(cursor.getString(5));
//返回候选人
返回候选人;
}
公共列表getAllCandidates(){
List candidateList=新建ArrayList();
//选择所有查询
String selectQuery=“SELECT*FROM”+表\u候选人;
SQLiteDatabase db=this.getWritableDatabase();
Cursor Cursor=db.rawQuery(selectQuery,null);
//循环遍历所有行并添加到列表
if(cursor.moveToFirst()){
做{
候选者=新候选者();
candidate.set_name(cursor.getString(0));
candidate.set_office(cursor.getString(1));
candidate.set_photo(cursor.getString(2));
candidate.set_promiss(cursor.getString(3));
candidate.set_station(cursor.getString(4));
set_active(Integer.parseInt(cursor.getString(5));
//将候选人添加到列表中
候选人名单。添加(候选人);
}while(cursor.moveToNext());
}
//返回候选名单
返回候选人名单;
}
public int updateCandidate(候选){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues=新的ContentValues();
value.put(KEY_NAME,candidate.get_NAME());//candidate NAME
value.put(KEY_OFFICE,candidate.get_OFFICE());//候选电话
value.put(KEY_PHOTO,candidate.get_PHOTO());
value.put(KEY_PROMISSES,candidate.get_PROMISSES());
value.put(KEY_station,candidate.get_station());
value.put(KEY_ACTIVE,candidate.get_ACTIVE());
//更新行
返回db.update(表候选项、值、键名称+“=?”,
新字符串[]{String.valueOf(candidate.get_name())});
}
//删除单个候选人
公众候选人(候选人){
SQLiteDatabase db=this.getWritableDatabase();
db.delete(表候选项,键名称+“=?”,
新字符串[]{String.valueOf(candidate.get_name())});
db.close();
}
//让候选人发挥作用
public int getCandidatesCount(){
String countQuery=“SELECT*FROM”+表\候选项;
SQLiteDatabase db=this.getReadableDatabase();
Cursor Cursor=db.rawQuery(countQuery,null);
cursor.close();
//返回计数
返回cursor.getCount();
}
}
包com.s104512.electionvoter;
导入java.util.List;
导入com.s104512.electionvoter.Candidate;
导入com.s104512.electionvoter.DatabaseHandler;
导入com.s104512.electionvoter.R;
导入android.os.Bundle;
导入android.app.Activity;
导入android.util.Lo
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);
}
}
}
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 TABLE " + TABLE_CANDIDATES + " (id INTEGER PRIMARY KEY, name TEXT, office TEXT, photograph TEXT, promisses TEXT, statment TEXT, active TEXT)");