zoukankan      html  css  js  c++  java
  • SQLiteParameter不能将TableName作为参数

    http://stackoverflow.com/questions/1274432/sqlite-parameters-not-allowing-tablename-as-parameter

    Generally one cannot use SQL parameters/placeholders for database identifiers (tables, columns, views, schemas, etc.) or database functions (e.g., CURRENT_DATE), but instead only for binding literal values.

    placeholder 占位符

    identifiers 标识符,认同者;检验人,鉴定人

    literal 文字的;逐字的;无夸张的

    With server-side support for parameterized (a.k.a. prepared) statements, the DB engine parses your query once, remembering out the peculiars of any parameters -- their types, max lengths, precisions, etc. -- that you will bind in subsequent executions of the already-parsed query. But the query cannot be properly parsed into its syntactic elements if critical bits, like database objects, are unknown.

    peculiar 特权;特有财产

    precisions 精度,[数] 精密度;精确

    subsequent  后来的,随后的

    syntactic  句法的;语法的;依据造句法的

    critical  鉴定的;[核] 临界的;批评的,爱挑剔的;危险的;决定性的;评论的

    So, one generally has to substitute table names oneself, in a stored procedure or in client code which dynamically concats/interpolates/whatevers the SQL statement to be properly executed. In any case, please remember to use your SQL API's function for quoting database identifiers, since the API won't do it for you.

    substitute  代用品;代替者

    stored procedur 存储过程

    concat 合并多个数组;合并多个字符串

    interpolate   vt. 篡改;插入新语句    vi. 插入;篡改

    quote    n. 引用   vi. 报价;引用;引证   vt. 报价;引述;举证

  • 相关阅读:
    关于this的指向问题
    blued面经
    数美(sm)面经
    xue球 面经
    jquery中的$("#id")与document.getElementById("id")的区别
    如何知道iframe文件下载download完成
    前端linux基础
    Vue.js 初级面试题
    React 面试题
    从输入URL到页面加载的过程
  • 原文地址:https://www.cnblogs.com/chucklu/p/4539009.html
Copyright © 2011-2022 走看看