shell 中调用 mysql 操作
#!/bin/bash
#删除100个数据库中的1000个表的过期数据
DBHOST="127.0.0.1"
DBPWD="pwd"
DBUSER="root"
MYSQLBIN="/usr/local/mysql/bin/mysql"
for((dbindex = 0;dbindex < 100;dbindex++))
do
for((tabindex = 0;tabindex < 10;tabindex++))
do
if [ $dbindex -lt 10 ]; then
del="delete from gs_map_0${dbindex}.t_${tabindex}";
else
del="delete from gs_map_${dbindex}.t_${tabindex}";
fi
del=${del}" where Fcreate_time < UNIX_TIMESTAMP() - 86400"
bin=`${MYSQLBIN} -u${DBUSER} -p${DBPWD} -h${DBHOST} -e"${del}"`
$bin
#echo ${bin}
#echo $del >>/tmp/aaa.txt
sleep 5
done
done
#crontab configure
# 0 3 * * * clear.sh > /dev/null 2>&1
相关文档：
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 ......
先下载一个mysql的驱动器：（我下的是mysql-connector-java-3.1.11-bin.jar）
将它放到java\lib目录下
在环境变量的CLASSPATH里添加该类（%JAV_HOMG%\lib\mysql-connector-java-3.1.11-bin.jar)
出测试该段代码即可：
import java.net.URL;
import java.sql.*;
public class sqlTest {
public static void mai ......
（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");
......
