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一、打开数据库 函数
int sqlite3_open(char *path,sqlite3 **db) path : 数据库文件的路径 db : 指向sqlite句柄的指针
返回值 ：成功返回 0，失败返回错误代码 //打开数据库文件，如果没有就创建，在数据库文件当中再创建表格，保存数据
二、数据库关闭 函数
int sqlite3_close(sqlite3 *db); 功能 ： 关闭sqlite数据库 返回值 ：成功返回0，失败返回错误代码 const
char *sqlite3_errmg(sqlite3 *db); 返回值 ： 返回错误信息
三、带回调函数的数据库操作函数（执行数据库命令的函数）
int sqlite3_exec(sqlite3 *db,const char *sql,sqlite3_callback callback,void
*,char **errmsg); 功能：执行SQL操作 db ： 数据库句柄 sql ： SQL语句 callback ：
回调函数（在查询数据的时候，每读取一行的数据就会调取一次回调函数，并把这一行的数据传给回调函数） void *：传给回调函数的参数 errmsg ：
错误信息的二级指针，传一个一级指针的地址进去，函数会让这个指针指向错误信息的起始地址 返回值 ： 成功返回0，失败返回错误代码 Typedef int
(*sqlite3_callback) (void *arg,int columns, char** value,char** name); arg ：
调用上一层函数是，要传给这个函数的数据 colums ： 这一行数据一共有多少列 value ； 数据值（字符串形式） name ： 每个数据对应的列名字
