SQLITE源码剖析(12)

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声明：本SQLite源码剖析系列为刘兴(http://deepfuture.iteye.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

** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()],

** 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[sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]，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 [database connection] 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.