Android SQLiteDatabase 插入语法错误

Question

我四处搜索，发现有人有类似的问题，但又不完全相同。我收到 SQLite 语法错误，但我找不到错误的语法。请帮忙！

我在 DatabaseAdapter.java 中创建了一个 SQLite 数据库，见此处：

static class DatabaseHelper extends SQLiteOpenHelper{
        private static final String DATABASE_NAME = "mealdatabase";
        private static final String TABLE_INGREDIENT = "INGREDIENTS";
        private static final int DATABASE_VERSION = 1;
        private static final String UID = "_id";
        private static final String INGREDIENT_NAME = "Ingredient Name";
        private static final String SERVING_UNITS = "Serving Units";
        private static final String SPC = "Servings Per Container";
        private static final String CREATE_TABLE_INGREDIENT = "CREATE TABLE "+TABLE_INGREDIENT+
                " ("+UID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+INGREDIENT_NAME+" VARCHAR(255), "
                +SERVING_UNITS+" VARCHAR(255), "+SPC+" VARCHAR(255));";

        private static final String DROP_TABLE_INGREDIENT = "DROP TABLE IF EXISTS "+TABLE_INGREDIENT;
        private Context context;

        public DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
            this.context=context;
            Message.message(context, "Constructor Called");
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            try {
                db.execSQL(CREATE_TABLE_INGREDIENT);
                Message.message(context, "onCreate Called");
            } catch (SQLException e) {
                Message.message(context, ""+e);
            }

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            try {
                Message.message(context, "onUpgrade Called");
                db.execSQL(DROP_TABLE_INGREDIENT);
                //context.deleteDatabase(DATABASE_NAME);
                onCreate(db);
            } catch (SQLException e) {
                Message.message(context, ""+e);
            }

        }
    }

我正在尝试将新数据插入现有的 SQLite 数据库。数据库创建时没有错误。但是，当调用我的插入函数时，出现以下语法错误：

03-06 20:44:27.559: E/SQLiteLog(968): (1) near "Per": syntax error
03-06 20:44:27.619: E/SQLiteDatabase(968): Error inserting Servings Per Container=8.0 Serving Units=oz Ingredient Name=Spaghetti Noodle

这里是我调用 NewIngredient.java:

中的插入函数的地方

public void saveIngredientData() {

        try {
            String ingredient = ingredient_editText.getText().toString();
            String servingUnits = spinner.getSelectedItem().toString();
            double servPerContainer = Double.parseDouble(SPC_editText.getText().toString());

            long id = databaseHelper.insertIngredientData(ingredient, servingUnits, servPerContainer);
            if (id < 0)
            {
                Message.message(this, "Insert was Unsuccessful");
            }
            else
                Message.message(this, "Successfully entered a row");
        } catch (NumberFormatException e) {
            Message.message(getApplicationContext(), ""+e);
        }

这里是包含语法错误的 insertIngredientData 函数，位于 DatabaseAdapter.java:

public long insertIngredientData(String ingredientName, String units, double spc){
    SQLiteDatabase db = helper.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(DatabaseHelper.INGREDIENT_NAME, ingredientName);
    contentValues.put(DatabaseHelper.SERVING_UNITS, units);
    contentValues.put(DatabaseHelper.SPC, spc);
    long id = db.insert(DatabaseHelper.TABLE_INGREDIENT, null, contentValues);
    db.close();
    return id;
}

Answer 1

您在字段名称中使用了空格。

您最好使用下划线 (_)。即：private static final String SPC = "Servings_Per_Container";.
或者（如果您真的想坚持使用空格），您必须将字段名称包含在方括号中（[ 和 ]）。即：private static final String SPC = "[Servings Per Container]";.

更正 ALL 您的字段名称，而不仅仅是示例中的那个。

Android SQLiteDatabase 插入语法错误

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