功能 退出_点击()
var c**tr = "Driver=MySQL ODBC 5.0 Driver;Server=localhost;UID=root;PWD=123456;Database=studentinfo;Port=3306"
var sql = "SELECT * FROM student"
var line = 0
var ret_array
var err
var ret
//查询数据
ret = database(c**tr,sql,line,ret_array,err)
gridfillarraydata("info",ret_array)