SQLITE源码剖析(14)
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**sqlite3_exec()回调函数的第2个参数是结果的列数，第3个参数
**是从sqlite3_column_text()获取的每列字符串指针的数组，为相关结果列
** ^The 2nd argument to the sqlite3_exec() callback function is the
** number of columns in the result. ^The 3rd argument to the sqlite3_exec()
** callback is an array of pointers to strings obtained as if from
** , one for each column. ^If an element of a
** result row is NULL then the corresponding string pointer for the
** sqlite3_exec() callback is a NULL pointer. ^The 4th argument to the
** sqlite3_exec() callback is an array of pointers to strings where each
** entry represents the name of corresponding result column as obtained
** from .
**如果结果行的一个元素是NULL，则sqlite3_exec()回调的相应字符串指针
**是NULL。sqlite3_exec() 回调的第4个参数是字符串指针的数组，为相关结果列的名称，从sqlite3_column_name()获得
** ^If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
** to an empty string, or a pointer that contains only whitespace and/or
** SQL comments, then no SQL statements are evaluated and the database
** is not changed.
**如果sqlite3_exec()的第2个参数(SQL语句)为空指针、空字符串或仅包含空格的SQL，则没有SQL语句被 执行，数据库不会改变。
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