è§£å†³ c3p0 å’?MySQL é›†æˆæƒ…å†µä¸‹ï¼Œ˜qžæŽ¥é•¿æ—¶é—´é—²¾|®åŽé‡æ–°ä½¿ç”¨æ—¶æŠ¥é”™çš„é—®é¢˜

abin — Mon, 15 Dec 2014 12:15:00 GMT

MySQL çš„é»˜è®¤è®¾¾|®ä¸‹åQŒå½“ä¸€ä¸ªè¿žæŽ¥çš„½Iºé—²æ—‰™—´‘…è¿‡8ž®æ—¶åŽï¼ŒMySQL ž®×ƒ¼šæ–å¼€è¯¥è¿žæŽ¥ï¼Œè€?c3p0 ˜qžæŽ¥æ± åˆ™ä»¥äØ“è¯¥è¢«æ–å¼€çš„è¿žæŽ¥ä¾ç„¶æœ‰æ•ˆã€‚åœ¨˜q™ç§æƒ…å†µä¸‹ï¼Œå¦‚æžœå®¢æˆ·ç«¯ä»£ç å‘ c3p0 ˜qžæŽ¥æ± è¯·æ±‚è¿žæŽ¥çš„è¯ï¼Œ˜qžæŽ¥æ± å°±ä¼šæŠŠå·²ç»å¤±æ•ˆçš„è¿žæŽ¥è¿”å›žç»™å®¢æˆ·ç«¯ï¼Œå®¢æˆ·ç«¯åœ¨ä½¿ç”¨è¯¥å¤±æ•ˆè¿žæŽ¥çš„æ—¶å€™å³æŠ›å‡ºå¼‚å¸¸ã€?/span>
è§£å†³˜q™ä¸ªé—®é¢˜çš„åŠžæ³•æœ‰ä¸‰ç§åQ?/span>
1. å¢žåŠ MySQL çš?wait_timeout å±žæ€§çš„å€¹{€?/span>
ä¿®æ”¹ /etc/mysql/my.cnf æ–‡äšgåQŒåœ¨ [mysqld] èŠ‚ä¸è®„¡½®åQ?/span>

# Set a connection to wait 8 hours in idle status.
wait_timeout = 86400

2. å‡å°‘˜qžæŽ¥æ± å†…˜qžæŽ¥çš„ç”Ÿå˜å‘¨æœŸï¼Œä½¿ä¹‹ž®äºŽä¸Šä¸€™å¹ä¸æ‰€è®„¡½®çš?wait_timeout çš„å€¹{€?/span>
ä¿®æ”¹ c3p0 çš„é…¾|®æ–‡ä»Óž¼Œè®„¡½®åQ?/span>

# How long to keep unused connections around(in seconds)
# Note: MySQL times out idle connections after 8 hours(28,800 seconds)
# so ensure this value is below MySQL idle timeout
cpool.maxIdleTime=25200

åœ?Spring çš„é…¾|®æ–‡ä»¶ä¸åQ?/span>

3. å®šæœŸä½¿ç”¨˜qžæŽ¥æ± å†…çš„è¿žæŽ¥ï¼Œä½¿å¾—å®ƒä»¬ä¸ä¼šå› äØ“é—²ç½®‘…æ—¶è€Œè¢« MySQL æ–å¼€ã€?/span>
ä¿®æ”¹ c3p0 çš„é…¾|®æ–‡ä»Óž¼Œè®„¡½®åQ?/span>

# Prevent MySQL raise exception after a long idle time
cpool.preferredTestQuery='SELECT 1'
cpool.idleConnectionTestPeriod=18000
cpool.testConnectionOnCheckout=true

ä¿®æ”¹ Spring çš„é…¾|®æ–‡ä»Óž¼š

<bean id="dataSource"
    class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="preferredTestQuery"
        value="${cpool.preferredTestQuery}" />
    <property name="idleConnectionTestPeriod"
        value="${cpool.idleConnectionTestPeriod}" />
    <property name="testConnectionOnCheckout"
        value="${cpool.testConnectionOnCheckout}" />
    
bean>

é™„ï¼šä»¥ä¸‹ awk è„šæœ¬å¯ä»¥ç”¨ä»¥ž®?c3p0.properties æ–‡äšgä¸çš„å±žæ€§è®¾¾|®è{æ¢æˆä¸?applicationContext.xml ä¸?æ•°æ®åº“è¿žæŽ¥æ± DataSource æ‰€éœ€çš?XML å…ƒç´ å½¢å¼ã€?/span>

#!/bin/awk

BEGIN {
    FS="=";
}
{
    if (NF == 2) {
        if ((x=index($1, ".")) > 0) {
            property_name = substr($1, x+1, length($1));
        } else {
            property_name = $1;
        }
        printf(" ", property_name, $1);
    }
}

abin 2014-12-15 20:15 å‘è¡¨è¯„è®º

]]>

欧美日韩精品在线观看,欧美综合欧美视频,99精品国产在热久久

è§£å†³ c3p0 å’?MySQL é›†æˆæƒ…å†µä¸‹ï¼Œ˜qžæŽ¥é•¿æ—¶é—´é—²¾|®åŽé‡æ–°ä½¿ç”¨æ—¶æŠ¥é”™çš„é—®é¢˜

è§£å†³ c3p0 å’?MySQL é›†æˆæƒ…å†µä¸‹ï¼Œ˜qžæŽ¥é•¿æ—¶é—´é—²¾|®åŽé‡æ–°ä½¿ç”¨æ—¶æŠ¥é”™çš„é—®é¢˜