jdcp.jar 和pool.jar 包下載地址:
http://commons.apache.org/proper/commons-pool/download_pool.cgi
http://commons.apache.org/proper/commons-dbcp/download_dbcp.cgi
http://commons.apache.org/proper/commons-pool/download_pool.cgi
http://commons.apache.org/proper/commons-dbcp/download_dbcp.cgi
2018-05-03
沒有人是編碼錯(cuò)誤嗎?暈,我都不知道怎么改
已采納回答 / 慕俠2097101
不是提示你了嗎,你寫的是adn ? 應(yīng)該是and
c3p0.properties要放在src目錄下!配置成功后,測(cè)試顯示c3p0比dbcp還快!基本就是這個(gè)速度:
通過數(shù)據(jù)庫(kù)直連-----1523858360516-1523858360203=313
通過dbcp連接池----1523858360617-1523858360516=101
通過c3p0連接池----1523858360637-1523858360617=20
通過數(shù)據(jù)庫(kù)直連-----1523858360516-1523858360203=313
通過dbcp連接池----1523858360617-1523858360516=101
通過c3p0連接池----1523858360637-1523858360617=20
2018-04-16
In the beginning was the Word, and the Word was with God, and the Word was God. (John1:1 NIV)
2018-03-08
點(diǎn)擊網(wǎng)頁中Files中的jar選項(xiàng)可直接下載
dbcp:
http://mvnrepository.com/artifact/commons-logging/commons-logging/1.2
http://mvnrepository.com/artifact/org.apache.commons/commons-pool2/2.5.0
http://mvnrepository.com/artifact/commons-dbcp/commons-dbcp/1.4
c3p0:
http://mvnrepository.com/artifact/com.mchange/c3p0/0.9.5.2
dbcp:
http://mvnrepository.com/artifact/commons-logging/commons-logging/1.2
http://mvnrepository.com/artifact/org.apache.commons/commons-pool2/2.5.0
http://mvnrepository.com/artifact/commons-dbcp/commons-dbcp/1.4
c3p0:
http://mvnrepository.com/artifact/com.mchange/c3p0/0.9.5.2
2018-02-11
使用DBCPUtil的時(shí)候?yàn)榱苏{(diào)用構(gòu)造方法還要new一下的設(shè)定。。。
2018-02-11
最新回答 / qq_不會(huì)飛的豬_0
直接獲取連接較慢,創(chuàng)建連接和關(guān)閉連接所用的時(shí)間比在連接池在獲取連接和歸還連接所有的時(shí)間要多
2018-01-26
已采納回答 / 余生遙望素
MySQL儲(chǔ)存過程的具體實(shí)現(xiàn)在于 SQL語句的執(zhí)行。jdbc通過連接類com.mysql.jdbc.Driver連接到MySQL,然后執(zhí)行SQL語句;即實(shí)現(xiàn)了儲(chǔ)存過程。Navicat是MySQL可視化工具,在Navicat中創(chuàng)建的儲(chǔ)存過程會(huì)直接映射到MySQL中。至于為什么可以jdbc可以調(diào)用到,是因?yàn)閖dbc連接著MySQL。具體的機(jī)制(個(gè)人理解):應(yīng)該是數(shù)據(jù)同步共享。