Android 没有这样的 table 代码 1 SQLITE_ERROR

Question

我正在为一个 sql 查询而苦苦挣扎我有：

"SELECT A.ingredient_quantity, B.measurement_name, B.ingredient_name, B.description " + 
"FROM TABLE_QUANTITY JOIN TABLE_INGREDIENT ON A.ingredient = B.ingredient_name"

这告诉我：

no such table: TABLE_QUANTITY (code 1 SQLITE_ERROR)

table是：

private static final String CREATE_TABLE_QUANTITY = "CREATE TABLE " + TABLE_QUANTITY + "(" + COL_ID +
     " INTEGER PRIMARY KEY, AUTO INCREMENT," + COL_INGREDIENT_QUANTITY + " NUMERIC, " +
     COL_RECIPE + " TEXT," + COL_INGREDIENT + " TEXT, FOREIGN KEY (" + COL_RECIPE + ") " +
     "REFERENCES " + TABLE_RECIPE + "(" + COL_RECIPE_NAME + "), FOREIGN KEY (" + COL_INGREDIENT + ") " +
     "REFERENCES " + TABLE_INGREDIENTS + "(" + COL_INGREDIENT_NAME + "))";

private static final String CREATE_TABLE_INGREDIENTS = "CREATE TABLE " + TABLE_INGREDIENTS + "("
     + COL_ID + " INTEGER PRIMARY KEY, AUTO INCREMENT," + COL_INGREDIENT_NAME + " TEXT,"
     + COL_DESCRIPTION + " TEXT," + COL_MEASUREMENT + " TEXT," + COL_INGREDIENT_TYPE + " TEXT, " +
     "FOREIGN KEY (" + COL_MEASUREMENT + ") REFERENCES " + TABLE_MEASUREMENT + "(" + COL_MEASUREMENT_NAME + "), " +
     "FOREIGN KEY (" + COL_INGREDIENT_TYPE + ") REFERENCES " + TABLE_INGREDIENT_TYPE + "(" + COL_TYPE_NAME + "))";

更新

public void loadRecipe() {
    itemRecipe.clear();
    db = (new DatabaseManager(this).getWritableDatabase());
    String RECIPE_SEARCH = " SELECT + A.ingredient_quantity, B.measurement_name, B.ingredient_name, B.description " +
            "FROM " + DatabaseManager.TABLE_QUANTITY + " AS A JOIN " + DatabaseManager.TABLE_INGREDIENTS +
            " AS B ON A.ingredient = B.ingredient_name";
    String selectQuery = "";
    selectQuery = selectQuery + RECIPE_SEARCH;

    c = db.rawQuery(selectQuery, new String[]{"%" + search_name + "%"});
    if (c.moveToFirst()) {
        do {
            RecipeList recipeList = new RecipeList();
            recipeList.setId(c.getInt(c.getColumnIndex("COL_ID")));
            recipeList.setIngredient_amount(c.getString(c.getColumnIndex("COL_INGREDIENT_QUANTITY")));
            recipeList.setMeasurement_name(c.getString(c.getColumnIndex("COL_MEASUREMENT_NAME")));
            recipeList.setIngredient_name(c.getString(c.getColumnIndex("COL_INGREDIENT_NAME")));
            recipeList.setDescription(c.getString(c.getColumnIndex("COL_DESCRIPTION")));
            itemRecipe.add(recipeList);
        } while (c.moveToNext());
        c.close();
    }

}

根据建议做了一些修改，谢谢。然而还是越来越 Caused by: android.database.sqlite.SQLiteException: no such table: QUANTITY (code 1 SQLITE_ERROR): , 编译时: SELECT + A.ingredient_quantity, B.measurement_name, B.ingredient_name, B.description 从数量作为加入成分作为 B 在 A.ingredient = B.ingredient_name

Answer 1

TABLE_QUANTITY 和 TABLE_INGREDIENT 是字符串变量，您必须在 SQL 语句中连接它们并同时设置别名 A 和 B：

"SELECT A.ingredient_quantity, B.measurement_name, B.ingredient_name, B.description " +
"FROM " + TABLE_QUANTITY + "AS A JOIN " + TABLE_INGREDIENT + 
" AS B ON A.ingredient = B.ingredient_name"

同样错误的是：

INTEGER PRIMARY KEY, AUTO INCREMENT

在 2 个表的两个 CREATE 语句中。
去掉逗号，变成：

INTEGER PRIMARY KEY AUTOINCREMENT

您可能必须从设备上卸载该应用程序，以便删除数据库并重新运行以重新创建数据库和表。

Android 没有这样的 table 代码 1 SQLITE_ERROR

Android No such table code 1 SQLITE_ERROR

java

sqlite

android

android-sqlite