Question

我正在尝试检索数据库中的特定行，设置如下：

CREATE TABLE "Rules" ("credit" BOOL NOT NULL , "debit" BOOL NOT NULL , "product_code" INTEGER, "frequency" INTEGER, "percentage" FLOAT, "limit" FLOAT, "below" BOOL, "above" BOOL, "price" FLOAT)

我的代码是：

class Process_Rules

    def initialize()
            @rules = Array.new() {Array.new()}
    end

    def process()

        db = SQLite3::Database.open "Checkout.sqlite"
        #############################################

        productRules = db.execute "SELECT product_code FROM Rules WHERE product_code NOT NULL"

        @rules.push([])

        for i in 0..productRules.length

            @rules[0].push(productRules[i])
        end

        #############################################

        limitRules = db.execute "SELECT limit FROM Rules" #ERRORSOME HERE, PREVIOUS SQL STATEMENT EXECUTES FINE

        #############################################

        db.close()
    end
end

错误：

in 'initialize': near 'limit': syntax error (SQLite3::SQLException)

Answer 1

由于LIMIT是关键字，因此您必须引用它：

SELECT "limit" FROM Rules

检索特定SQL行的问题

1 个答案: