以下是我得到的错误：
java.lang.RuntimeException: Unable to start activity ComponentInfo{groceryproject.jacob.com.recipelist/groceryproject.jacob.com.recipelist.RecipeList}: android.database.sqlite.SQLiteException: no such column: prep_time (code 1): , while compiling: SELECT id, recipe_name, servings, prep_time, cook_time, ingredients, directions FROM recipes WHERE id=?
这是在我卸载应用程序并清除所有数据以确保我没有以前的数据库搞砸了我之后。下面是我的数据库类的代码：
package groceryproject.jacob.com.recipelist;
/**
* Created by Jacob on 11/12/2016.
*/
import java.util.ArrayList;
import java.util.Arrays;
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;
public class RecipeDB extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "recipeManager";
// Contacts table name
private static final String TABLE_RECIPES = "recipes";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "recipe_name";
private static final String KEY_COOK_TIME = "cook_time";
private static final String KEY_PREP_TIME = "prep_time";
private static final String KEY_SERVINGS = "servings";
private static final String KEY_INGREDIENTS = "ingredients";
private static final String KEY_DIRECTIONS = "directions";
public RecipeDB(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_RECIPES + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_SERVINGS + " TEXT," + " TEXT," + KEY_COOK_TIME + " TEXT,"
+ KEY_INGREDIENTS + " TEXT," + KEY_DIRECTIONS + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_RECIPES);
// Create tables again
onCreate(db);
}
void addRecipe(Recipe recipe) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, recipe.getRecipeName()); // Contact Name
values.put(KEY_SERVINGS, recipe.getServings()); // Contact Phone
values.put(KEY_PREP_TIME, recipe.getPrepTime());
values.put(KEY_COOK_TIME, recipe.getCookTime());
//Next few lines turns an array list of strings into one string seperated by tabs
String directionsConcat = "";
String ingedientsConcat = "";
if(recipe.getIngredients() != null) {
StringBuilder ingred = new StringBuilder();
for (String s : recipe.getIngredients()) {
ingred.append(s);
ingred.append("\t");
}
ingedientsConcat = ingred.toString();
}
if(recipe.getDirections() != null) {
StringBuilder direct = new StringBuilder();
for (String s : recipe.getDirections()) {
direct.append(s);
direct.append("\t");
}
directionsConcat = direct.toString();
}
values.put(KEY_INGREDIENTS, ingedientsConcat);
values.put(KEY_DIRECTIONS, directionsConcat);
db.insert(TABLE_RECIPES, null, values);
db.close(); // Closing database connection
}
Recipe getRecipe(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_RECIPES, new String[] { KEY_ID,
KEY_NAME, KEY_SERVINGS, KEY_PREP_TIME, KEY_COOK_TIME, KEY_INGREDIENTS, KEY_DIRECTIONS },
KEY_ID + "=?", new String[] { String.valueOf(id) }, null, null, null, null); //This line is where the error points to
if (cursor != null)
cursor.moveToFirst();
List<String> directionsList = new ArrayList<>();
List<String> ingredientsList = new ArrayList<>();
String ingredients = cursor.getString(5);
String directions = cursor.getString(6);
if (directions != null){
if(directions.contains("\t")) {
directionsList = Arrays.asList(directions.split("\t"));
}
else{
directionsList = Arrays.asList(directions);
}
}
if (ingredients != null){
if(ingredients.contains("\t")) {
ingredientsList = Arrays.asList(ingredients.split("\t"));
}
else{
ingredientsList = Arrays.asList(ingredients);
}
}
Recipe recipe = new Recipe(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2),
cursor.getString(3), cursor.getString(4), ingredientsList, directionsList);
return recipe;
}
public List<Recipe> getAllRecipes() {
List<Recipe> recipeList = new ArrayList<Recipe>();
String selectQuery = "SELECT * FROM " + TABLE_RECIPES;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
Recipe recipe = new Recipe();
recipe.setID(Integer.parseInt(cursor.getString(0)));
recipe.setRecipeName(cursor.getString(1));
recipe.setServingSize(cursor.getString(2));
recipe.setPrepTime(cursor.getString(3));
recipe.setCookTime(cursor.getString(4));
List<String> directionsList = new ArrayList<>();
List<String> ingredientsList = new ArrayList<>();
String ingredients = cursor.getString(5);
String directions = cursor.getString(6);
if (directions != null){
if(directions.contains("\t")) {
directionsList = Arrays.asList(directions.split("\t"));
}
else{
directionsList = Arrays.asList(directions);
}
}
if (ingredients != null){
if(ingredients.contains("\t")) {
ingredientsList = Arrays.asList(ingredients.split("\t"));
}
else{
ingredientsList = Arrays.asList(ingredients);
}
}
recipe.setIngredients(ingredientsList);
recipe.setDirections(directionsList);
recipeList.add(recipe);
} while (cursor.moveToNext());
}
return recipeList;
}
public int updateRecipe(Recipe recipe) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, recipe.getRecipeName()); // Contact Name
values.put(KEY_SERVINGS, recipe.getServings()); // Contact Phone
values.put(KEY_PREP_TIME, recipe.getPrepTime());
values.put(KEY_COOK_TIME, recipe.getCookTime());
//Next few lines turns an array list of strings into one string seperated by tabs
String directionsConcat = "";
String ingedientsConcat = "";
if(recipe.getIngredients() != null) {
StringBuilder ingred = new StringBuilder();
for (String s : recipe.getIngredients()) {
ingred.append(s);
ingred.append("\t");
}
ingedientsConcat = ingred.toString();
}
if(recipe.getDirections() != null) {
StringBuilder direct = new StringBuilder();
for (String s : recipe.getDirections()) {
direct.append(s);
direct.append("\t");
}
directionsConcat = direct.toString();
}
values.put(KEY_INGREDIENTS, ingedientsConcat);
values.put(KEY_DIRECTIONS, directionsConcat);
// updating row
return db.update(TABLE_RECIPES, values, KEY_ID + " = ?",
new String[] { String.valueOf(recipe.getID()) });
}
public void deleteRecipe(Recipe recipe) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_RECIPES, KEY_ID + " = ?",
new String[] { String.valueOf(recipe.getID()) });
db.close();
}
public int getRecipeCount() {
String countQuery = "SELECT * FROM " + TABLE_RECIPES;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
当我从我的主Activity类中调用getRecipe()时，会出现此问题：
package groceryproject.jacob.com.recipelist;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Parcelable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.util.ArrayList;
import java.util.List;
public class RecipeList extends AppCompatActivity{
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private int REQUEST_CODE=1;
//private SQLiteDatabase mDatabase;
//TODO: Create a new taskbar
//TODO: Create a navigaton bar.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RecipeDB dbHelper = new RecipeDB(this);
/*
if(savedInstanceState != null){
recipes = savedInstanceState.getParcelableArrayList("savedRecipes");
}
*/
ArrayList<String> one = new ArrayList<>();
one.add("Test");
Recipe testRecipe = new Recipe("Name", "Four slices", "40", "80", one, one);
dbHelper.addRecipe(testRecipe);
Recipe testTwo = dbHelper.getRecipe(1); //This is where it breaks
List<Recipe> recipes = dbHelper.getAllRecipes();
recipes.add(testTwo); //This is to prove the adapter is working
String log = "No results";
for (Recipe rn : recipes){
log = "Id: " + rn.getID() + ", Name: " + rn.getRecipeName();
}
Log.d("Name, ", log);
//This log is printing no results when the app actually runs
setContentView(R.layout.activity_recipe_list);
mRecyclerView = (RecyclerView) findViewById(R.id.list_recycler_view);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(recipes);
mRecyclerView.setAdapter(mAdapter);
}
getRecipe()中的光标行是错误日志指向的位置。只有在我拨打getRecipe()时才会发生这种情况。如果我要从调用getAllRecipes()创建一个列表，并将其传递给适配器，它在启动时不会崩溃，但ArrayList也是空的。
我知道适配器有效，因为如果我手动将其添加到数组列表配方中，它会正确显示在屏幕上。这是造成这个问题的数据库。
我已经在这方面工作了好几天，并试图在SO上查看许多类似的问题，我只是感到困惑。任何建议都表示赞赏。
答案 0 :(得分：1)
检查CREATE_CONTACTS_TABLE变量，我没有看到预备时密钥。而Contacts是一个Recipe表变量的奇怪名称....
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_RECIPES + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_SERVINGS + " TEXT," + " TEXT," + KEY_COOK_TIME + " TEXT,"
+ KEY_INGREDIENTS + " TEXT," + KEY_DIRECTIONS + " TEXT" + ")";
添加列后，您还需要更新DATABASE_VERSION以反映这些更改。
答案 1 :(得分：0)
你没有在你的oncreate命令中添加KEY_PREP_TIME