Java android.database.sqlite.SQLiteException:没有这样的列:name(代码1 sqlite\u错误)
我目前正在调整一个Android应用程序,我有一个相当简单的问题,我无法解决 在“onClick”之后,我想在我的数据库中检索一个特殊的数据(在本例中,是加密货币的名称),但是数据存在,并且名称良好,问题来自请求,而不是解决方法 原因:android.database.sqlite.SQLiteException:没有这样的列:name(代码1 sqlite_错误):,编译时:从cryptoName=name的硬币中选择* 下面是我的sqliteDatabase.java的源代码Java android.database.sqlite.SQLiteException:没有这样的列:name(代码1 sqlite\u错误),java,android,database,sqlite,Java,Android,Database,Sqlite,我目前正在调整一个Android应用程序,我有一个相当简单的问题,我无法解决 在“onClick”之后,我想在我的数据库中检索一个特殊的数据(在本例中,是加密货币的名称),但是数据存在,并且名称良好,问题来自请求,而不是解决方法 原因:android.database.sqlite.SQLiteException:没有这样的列:name(代码1 sqlite_错误):,编译时:从cryptoName=name的硬币中选择* 下面是我的sqliteDatabase.java的源代码 package
package com.example.cryptoapp;
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;
import java.util.ArrayList;
public class SqliteDatabase extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 5;
private static final String DATABASE_NAME = "cryptoBase";
private static final String TABLE_COINS = "COINS";
private static final String COLUMN_ID = "_id";
private static final String COLUMN_CRYPTONAME = "cryptoName";
private static final String COLUMN_QUANTITY = "quantity";
private static final String COLUMN_TOTALVALUE = "totalValue";
public SqliteDatabase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_COINS_TABLE = "CREATE TABLE " + TABLE_COINS + "(" + COLUMN_ID + " INTEGER PRIMARY KEY," + COLUMN_CRYPTONAME + " TEXT," + COLUMN_QUANTITY + " TEXT," + COLUMN_TOTALVALUE + " TEXT" + ")";
db.execSQL(CREATE_COINS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_COINS);
onCreate(db);
}
public ArrayList<Coins> listCoins(){
String sql = "select * from " + TABLE_COINS;
SQLiteDatabase db = this.getReadableDatabase();
ArrayList<Coins> storeCoins = new ArrayList<>();
Cursor cursor = db.rawQuery(sql, null);
if(cursor.moveToFirst()){
do{
int id = Integer.parseInt(cursor.getString(0));
String cryptoname = cursor.getString(1);
String quantity = cursor.getString(2);
String totalvalue = cursor.getString(3);
storeCoins.add(new Coins(id, cryptoname, quantity, totalvalue));
}while (cursor.moveToNext());
}
cursor.close();
return storeCoins;
}
public void addCoins(Coins coins){
Log.d("TESTINADD", coins.getCryptoName());
ContentValues values = new ContentValues();
values.put(COLUMN_CRYPTONAME, coins.getCryptoName());
values.put(COLUMN_QUANTITY, coins.getQuantity());
values.put(COLUMN_TOTALVALUE, coins.getTotalValue());
SQLiteDatabase db = this.getWritableDatabase();
db.insert(TABLE_COINS, null, values);
}
public void updateCoins(Coins coins){
ContentValues values = new ContentValues();
values.put(COLUMN_CRYPTONAME, coins.getCryptoName());
values.put(COLUMN_QUANTITY, coins.getQuantity());
values.put(COLUMN_TOTALVALUE, coins.getTotalValue());
SQLiteDatabase db = this.getWritableDatabase();
db.update(TABLE_COINS, values, COLUMN_ID + " = ?", new String[] { String.valueOf(coins.getId())});
}
public Coins findCrypto(String name){
String query = "Select * FROM " + TABLE_COINS + " WHERE " + COLUMN_CRYPTONAME + " = " + "name";
SQLiteDatabase db = this.getWritableDatabase();
Coins coins = null;
Log.d("TESTquery", query);
Cursor cursor = db.rawQuery(query, null);
if (cursor.moveToFirst()){
int id = Integer.parseInt(cursor.getString(0));
String mName = cursor.getString(1);
String mQuantity = cursor.getString(2);
String mTotalValue = cursor.getString(3);
coins = new Coins(id, mName, mQuantity, mTotalValue);
}
cursor.close();
Log.d("TEST", name);
Log.d("TEST1", coins.getCryptoName());
return coins;
}
public void deleteCoins(int id){
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_COINS, COLUMN_ID + " = ?", new String[] { String.valueOf(id)});
}
}
package com.example.cryptoapp;
导入android.content.ContentValues;
导入android.content.Context;
导入android.database.Cursor;
导入android.database.sqlite.SQLiteDatabase;
导入android.database.sqlite.SQLiteOpenHelper;
导入android.util.Log;
导入java.util.ArrayList;
公共类SqliteDatabase扩展了SQLiteOpenHelper{
私有静态最终int数据库_VERSION=5;
私有静态最终字符串数据库\u NAME=“cryptoBase”;
私有静态最终字符串表\u COINS=“COINS”;
私有静态最终字符串列_ID=“_ID”;
私有静态最终字符串列\u CRYPTONAME=“CRYPTONAME”;
私有静态最终字符串列\u QUANTITY=“QUANTITY”;
私有静态最终字符串列\u TOTALVALUE=“TOTALVALUE”;
公共SqliteDatabase(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_COINS_TABLE=“CREATE TABLE”+TABLE_COINS+”(“+COLUMN_ID+”整数主键,“+COLUMN_CRYPTONAME+”文本,“+COLUMN_QUANTITY+”文本,“+COLUMN_TOTALVALUE+”文本“+”);
execSQL(创建表);
}
@凌驾
public void onUpgrade(SQLiteDatabase db,int-oldVersion,int-newVersion){
db.execSQL(“如果存在删除表”+表_);
onCreate(db);
}
公共ArrayList listCoins(){
String sql=“select*from”+表格;
SQLiteDatabase db=this.getReadableDatabase();
ArrayList storeCoins=新的ArrayList();
Cursor=db.rawQuery(sql,null);
if(cursor.moveToFirst()){
做{
intid=Integer.parseInt(cursor.getString(0));
String cryptoname=cursor.getString(1);
字符串数量=cursor.getString(2);
String totalvalue=cursor.getString(3);
添加(新硬币(id、加密名称、数量、总值));
}while(cursor.moveToNext());
}
cursor.close();
归还硬币;
}
公共无效添加硬币(硬币){
Log.d(“TESTINADD”,coins.getCryptoName());
ContentValues=新的ContentValues();
value.put(COLUMN_CRYPTONAME,coins.getCryptoName());
value.put(COLUMN_QUANTITY,coins.getQuantity());
value.put(COLUMN_TOTALVALUE,coins.getTotalValue());
SQLiteDatabase db=this.getWritableDatabase();
db.插入(表1,空,值);
}
公共作废更新密码(硬币){
ContentValues=新的ContentValues();
value.put(COLUMN_CRYPTONAME,coins.getCryptoName());
value.put(COLUMN_QUANTITY,coins.getQuantity());
value.put(COLUMN_TOTALVALUE,coins.getTotalValue());
SQLiteDatabase db=this.getWritableDatabase();
更新(表COINS,value,列ID+“=?”,新字符串[]{String.valueOf(COINS.getId())});
}
公共硬币findCrypto(字符串名称){
String query=“从“+表”+中选择*,其中“+列”\u CRYPTONAME+”=“+”名称”;
SQLiteDatabase db=this.getWritableDatabase();
硬币=零;
Log.d(“TESTquery”,query);
Cursor Cursor=db.rawQuery(查询,空);
if(cursor.moveToFirst()){
intid=Integer.parseInt(cursor.getString(0));
String mName=cursor.getString(1);
字符串mQuantity=cursor.getString(2);
字符串mTotalValue=cursor.getString(3);
硬币=新硬币(id、mName、mQuantity、mTotalValue);
}
cursor.close();
Log.d(“测试”,名称);
Log.d(“TEST1”,coins.getCryptoName());
归还硬币;
}
公共货币(内部id){
SQLiteDatabase db=this.getWritableDatabase();
db.delete(表_COINS,列_ID+“=?”,新字符串[]{String.valueOf(ID)});
}
}
提前谢谢你
String query = "Select * FROM " + TABLE_COINS + " WHERE " + COLUMN_CRYPTONAME + " = " + "name";
这里应该是:
String query = "Select * FROM " + TABLE_COINS + " WHERE " + COLUMN_CRYPTONAME + " LIKE " + "'" + name + "'";
您将名称作为字符串而不是变量传递,因此它是硬编码的,因此数据库中没有名为name的表,因此您得到了此异常以解决此问题,使查询如下所示
String query = "Select * FROM " + TABLE_COINS + " WHERE " + COLUMN_CRYPTONAME + " = " + name;
@SkypeDogg的答案是正确的