我已经按照以下方式编写了DB Helper类，并且面临将数据插入表格的问题。
这是我的DB助手：
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Admin on 2/24/2017.
*/
public class CompanyDatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 5;
// Database Name
private static final String DATABASE_NAME = "databaseofcompany";
// COMPANY table name
private static final String TABLE_COMPANY = "detailsofcompany";
// COMPANY Table Columns names
private static final String KEY_ID="_id";
private static final String KEY_COMPANYNAME="_companyName";
private static final String KEY_COMPANYURL="_companyUrl";
private static final String KEY_COMPANYEMAIL="_companyEmail";
private static final String KEY_COMPANYNUMMBER="_companyNumber";
private static final String KEY_COMPANYADDRESS="_companyAddress";
public CompanyDatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
/*
Creating new Table
*/
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_COMPANY_TABLE = "CREATE TABLE "
+ TABLE_COMPANY + "("+ KEY_ID + " INTEGER PRIMARY KEY,"+ KEY_COMPANYNAME + " TEXT,"+ KEY_COMPANYURL + " TEXT,"+ KEY_COMPANYEMAIL + " TEXT"+ KEY_COMPANYNUMMBER+" TEXT"+ KEY_COMPANYADDRESS+" TEXT"+")";
db.execSQL(CREATE_COMPANY_TABLE);
}
/*
Upgrading Table
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_COMPANY);
// Create tables again
onCreate(db);
}
// Adding new company
public void addCompany(Company company) {
SQLiteDatabase db = CompanyDatabaseHandler.this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_COMPANYNAME, company.getCompanyName());
values.put(KEY_COMPANYURL, company.getCompanyLink());
values.put(KEY_COMPANYEMAIL, company.getCompanyEmail());
values.put(KEY_COMPANYNUMMBER, company.getCompanyNumber());
values.put(KEY_COMPANYADDRESS, company.getCompanyAddress());
// Inserting Row
db.insert(TABLE_COMPANY, null, values);
// Closing database connection
db.close();
}
// Getting single company
public Company getCompany(int id) {SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_COMPANY, //Table
new String[] { KEY_COMPANYNAME,KEY_COMPANYURL,KEY_COMPANYEMAIL ,KEY_COMPANYNUMMBER,KEY_COMPANYADDRESS}, //Colunms
KEY_ID + "=?", //Selection KEY
new String[] { String.valueOf(id) },//Selection Args
null, //Group By
null, //Having
null); //Order By
if (cursor != null)
cursor.moveToFirst();
Company company=new Company(Integer.parseInt(cursor.getString(0)),cursor.getString(1),cursor.getString(2),cursor.getString(3),cursor.getString(4),cursor.getString(5));
// return company
return company;
}
// Getting All Company
public List<Company> getAllCompany() {
List<Company> companyList = new ArrayList<Company>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_COMPANY;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Company company = new Company();
company.setCompanyId(Integer.parseInt(cursor.getString(0)));
company.setCompanyName(cursor.getString(1));
company.setCompanyLink(cursor.getString(2));
company.setCompanyEmail(cursor.getString(3));
company.setCompanyNumber(cursor.getString(4));
company.setCompanyAddress(cursor.getString(5));
// Adding company to list
companyList.add(company);
} while (cursor.moveToNext());
}
// return companyList
return companyList;
}
// Getting company Count
public int getCompanyCount() {
String countQuery = "SELECT * FROM " + TABLE_COMPANY;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int count=cursor.getCount();
cursor.close();
return count;
// return cursor.getCount();
}
// Updating single Company
public int updateCompany(Company company) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_COMPANYNAME, company.getCompanyName());
values.put(KEY_COMPANYURL, company.getCompanyLink());
values.put(KEY_COMPANYEMAIL, company.getCompanyEmail());
values.put(KEY_COMPANYNUMMBER, company.getCompanyNumber());
values.put(KEY_COMPANYADDRESS, company.getCompanyAddress());
// updating row
return db.update(TABLE_COMPANY, values, KEY_ID + " = ?",
new String[] { String.valueOf(company.getCompanyId()) });
}
// Deleting single company
public void deleteCompany(Company company) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_COMPANY, KEY_ID + " = ?",
new String[] { String.valueOf(company.getCompanyId()) });
db.close();
}
}
但是在尝试添加表格时，我得到如下：
table detailsofcompany has no column named _companyAddress
02-25 20:12:29.781 19919-19919/############ E/SQLiteDatabase: Error inserting _companyAddress=Address here _companyEmail=xyz@abc.com _companyNumber=09876543210 _companyUrl=http://www.google.com _companyName=ABC COMPANY
android.database.sqlite.SQLiteException: table detailsofcompany has no column named _companyAddress (code 1): , while compiling: INSERT INTO detailsofcompany(_companyAddress,_companyEmail,_companyNumber,_companyUrl,_companyName) VALUES (?,?,?,?,?)
我是android SQLITE实现的新手。我已经尝试更新版本和更改数据库名称以及列名称，但它没有帮助。
我被困了你的建议会很有帮助。我不知道我哪里错了。
答案 0 :(得分：2)
CREATE_COMPANY_TABLE字符串中缺少逗号。对于两列，您在TEXT之后错过了逗号。在运行已完成更改的应用程序之前，还要卸载现有应用程序。
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_COMPANY_TABLE = "CREATE TABLE "
+ TABLE_COMPANY + "("+ KEY_ID + " INTEGER PRIMARY KEY,"+ KEY_COMPANYNAME + " TEXT,"+ KEY_COMPANYURL + " TEXT,"+ KEY_COMPANYEMAIL + " TEXT,"+ KEY_COMPANYNUMMBER+" TEXT,"+ KEY_COMPANYADDRESS+" TEXT"+")";
db.execSQL(CREATE_COMPANY_TABLE);
}