SQLITE源码剖析(12)
声明：本SQLite源码剖析系列为刘兴(http://deepfuture.iyunv.com/)原创，未经笔者授权，任何人和机构不能转载/*
** The type for a callback function.
** This is legacy and deprecated. It is included for historical
** compatibility and is not documented.
*/回调函数，不赞成这种旧版本遗留下来的机制，它被包含进来，为了历史兼
**容性,没有相关证实
typedef int (*sqlite3_callback)(void*,int,char**, char**);
/*
** CAPI3REF: One-Step Query Execution Interface
**查询执行接口
** The sqlite3_exec() interface is a convenience wrapper around
** , , and ,
** that allows an application to run multiple statements of SQL
** without having to use a lot of C code.
**sqlite3_exec()接口包装了, , and ，方便使用，允许应用程序执行多语句的SQL，无使用大量C代码
**sqlite3_exec()符合UTF8编码要求 ，用分号分隔的SQL语句为它的第二个
**参数，database connection数据 库连接为第一个参数，做为第三个参数的回调函数如果非空，则SQL执行结果的每一行都会调用该函数
** ^The sqlite3_exec() interface runs zero or more UTF-8 encoded,
** semicolon-separate SQL statements passed into its 2nd argument,
** in the context of the passed in as its 1st
** argument. ^If the callback function of the 3rd argument to
** sqlite3_exec() is not NULL, then it is invoked for each result row
** coming out of the evaluated SQL statements.
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