mysql下的分页存储过程
CREATE PROCEDURE pro_page(
in _sql varchar(1000),
in _order varchar(1000),
in _pagecurrent int,
in _pagesize int
)
BEGIN
if _pagesize<=1 then
set _pagesize=20;
end if;
if _pagecurrent < 1 then
set _pagecurrent = 1;
end if;
set @strsql = concat(_sql,' ',_order,' limit ',_pagecurrent*_pagesize-_pagesize,',',_pagesize);
prepare stmtsql from @strsql;
execute stmtsql;
deallocate prepare stmtsql;
END;
相关文档:
MySQL 字符串截取函数:left(), right(), substring(), substring_index()。还有 mid(), substr()。其中,mid(), substr() 等价于 substring() 函数,substring() 的功能非常强大和灵活。
1. 字符串截取:left(str, length)
mysql> select left('sqlstudy.com', 3);+-------------------------+| left('sqlstudy.com', 3) | ......
mysql数值范围
tinyint -128~127 0~255
smallint -32768~32767 0~65535
mediumint -8388608~8388607 0~16777215
int -2147483648~2147483647 0~4294967295
bigint -9223372036854775808~9223372036854775807 0~18446744073709551615
java中
byte ......
/**********************by garcon1986***************************************/
错误代码如下:
#1045 - Access denied for user 'root'@'localhost' (using password: YES)
$cd /etc/mysql
$mysql -u root -p
出现错误#1045
尝试了很多方法后,在网络上找到了解决方法。
$cd /etc/mysql
$gedit debian.cnf
找到 ......
1.DATE_FORMAT('2010-05-15 15:47:36','%H:%i:%s') -> 结果:15:47:36
将日期格式根据条件不同转换成所需要的日期、时间格式
2.timediff('23:40:00', ' 18:30:00') -> 结果:05:10:00
......
(1)INFORMATION_SCHEMA
select (sum(data_length) + sum(index_length))/(1024*1024) from INFORMATION_SCHEMA.`TABLES` where table_schema = 'your_table_schema' and table_name like 'your_table_name';
(2)show table status like '';
try {
Class.forName("com.mysql.jdbc.Driver");
......