Spring Boot數據庫鏈接池配置方法。本站提示廣大學習愛好者：（Spring Boot數據庫鏈接池配置方法）文章只能為提供參考，不一定能成為您想要的結果。以下是Spring Boot數據庫鏈接池配置方法正文
配置方法
基於當前的1.5.2.RELEASE的Spring Boot。
依照官方文檔，如果增加了如下依賴的配置，或者類路徑中存在spring-boot-starter-jdbc的jar，那麼已默認啟用了數據庫鏈接池。
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency>
Spring Boot選擇數據庫鏈接池實現的判斷邏輯：
1.檢查Tomcat的數據庫鏈接池實現是否可用，如可用，則啟用。使用spring.datasource.tomcat.*可以控制鏈接池的行為。
2.檢查HikariCP是否可用，如可用，則啟用。使用spring.datasource.hikari.*可以控制鏈接池的行為。
3.檢查Commons DBCP是否可用，如可用，則啟用；但Spring Boot不建議在生產環境使用該鏈接池的實現。
4.檢查Commons DBCP2是否可用，如可用，則啟用。使用spring.datasource.dbcp2.*可以控制鏈接池的行為。
使用tomcat-jdbc時，可在application.yml增加配置項spring.datasource.tomcat.*來控制鏈接池的行為。比如如下配置。
spring:
datasource:
url: jdbc:mysql://localhost:3306/jackieathome?useSSL=false
username: root
password: mypassword
# 6.x版本的MySQL JDBC驅動類為com.mysql.cj.jdbc.Driver
# 5.X版本的MySQL JDBC驅動類為com.mysql.jdbc.Driver
driver-class-name: com.mysql.cj.jdbc.Driver
tomcat:
max-wait: 10000
max-active: 30
test-on-borrow: true
# 傳遞MySQL JDBC特有的參數
db-properties:
logger: net.jackieathome.db.customized.MySQLLogger
gatherPerfMetrics: 'true'
profileSQL: 'true'
reportMetricsIntervalMillis: '60000'
logSlowQueries: 'true'
explainSlowQueries: 'true'
logging:
level: # 關閉其它軟件的日志，減少干擾 org: ERROR net: ERROR com: ERROR # 開啟MySQL JDBC驅動的日志 MySQL: DEBUG
上述spring.datasource.tomcat.*代表的配置項，可參考tomcat-jdbc的官方文檔Apache Tomcat 8.5 - The Tomcat JDBC Connection Pool或者Apache Tomcat 8.0 - The Tomcat JDBC Connection Pool。
依據tomcat-jdbc的文檔，如需要向數據庫的JDBC驅動傳入控制參數，可以使用db-properties字段。需要注意的是，當使用MySQL驅動時，控制參數的值需要強制轉換為字符串，否則創建數據庫鏈接時會報錯。配置方法如上述樣例中的 reportMetricsIntervalMillis: '60000'和logSlowQueries: 'true'。
依照MySQL JDBC驅動文檔，可以配置一個日志記錄器，用於記錄其工作時的輸出，如下是實現樣例。
package net.jackieathome.db.customized;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MySQLLogger implements com.mysql.cj.api.log.Log {
private static Logger LOG;
public MySQLLogger(String name) {
LOG = LoggerFactory.getLogger(name);
}
@Override
public boolean isDebugEnabled() {
return LOG.isDebugEnabled();
}
@Override
public boolean isErrorEnabled() {
return LOG.isErrorEnabled();
}
@Override
public boolean isFatalEnabled() {
return LOG.isErrorEnabled();
}
@Override
public boolean isInfoEnabled() {
return LOG.isInfoEnabled();
}
@Override
public boolean isTraceEnabled() {
return LOG.isTraceEnabled();
}
@Override
public boolean isWarnEnabled() {
return LOG.isWarnEnabled();
}
@Override
public void logDebug(Object msg) {
LOG.debug("{}", msg);
}
@Override
public void logDebug(Object msg, Throwable thrown) {
LOG.debug("{}", msg, thrown);
}
@Override
public void logError(Object msg) {
LOG.error("{}", msg);
}
@Override
public void logError(Object msg, Throwable thrown) {
LOG.error("{}", msg, thrown);
}
@Override
public void logFatal(Object msg) {
LOG.error("{}", msg);
}
@Override
public void logFatal(Object msg, Throwable thrown) {
LOG.error("{}", msg, thrown);
}
@Override
public void logInfo(Object msg) {
LOG.info("{}", msg);
}
@Override
public void logInfo(Object msg, Throwable thrown) {
LOG.info("{}", msg, thrown);
}
@Override
public void logTrace(Object msg) {
LOG.trace("{}", msg);
}
@Override
public void logTrace(Object msg, Throwable thrown) {
LOG.trace("{}", msg, thrown);
}
@Override
public void logWarn(Object msg) {
LOG.warn("{}", msg);
}
@Override
public void logWarn(Object msg, Throwable thrown) {
LOG.warn("{}", msg, thrown);
}
}
同時修改application.yml，增加相應的日志配置，如下。
logging:
level:
# 開啟MySQL JDBC驅動的日志
MySQL: DEBUG
如下是MySQL JDBC驅動輸出的樣例日志。
2017-04-16 00:51:32.626 QUERY created: Sun Apr 16 00:51:32 CST 2017 duration: 0 connection: 93 statement: 1 resultset: 1 message: /* mysql-connector-java-6.0.6 ( Revision: 3dab84f4d9bede3cdd14d57b99e9e98a02a5b97d ) */SELECT @@session.auto_increment_increment AS auto_increment_increment, @@character_set_client AS character_set_client, @@character_set_connection AS character_set_connection, @@character_set_results AS character_set_results, @@character_set_server AS character_set_server, @@init_connect AS init_connect, @@interactive_timeout AS interactive_timeout, @@license AS license, @@lower_case_table_names AS lower_case_table_names, @@max_allowed_packet AS max_allowed_packet, @@net_buffer_length AS net_buffer_length, @@net_write_timeout AS net_write_timeout, @@query_cache_size AS query_cache_size, @@query_cache_type AS query_cache_type, @@sql_mode AS sql_mode, @@system_time_zone AS system_time_zone, @@time_zone AS time_zone, @@tx_isolation AS tx_isolation, @@wait_timeout AS wait_timeout
2017-04-16 00:51:32.629 FETCH created: Sun Apr 16 00:51:32 CST 2017 duration: 36 connection: 93 statement: 1 resultset: 1
2017-04-16 00:51:32.639 QUERY created: Sun Apr 16 00:51:32 CST 2017 duration: 1 connection: 93 statement: 999 resultset: 0 message: SET NAMES latin1
2017-04-16 00:51:32.640 FETCH created: Sun Apr 16 00:51:32 CST 2017 duration: 0 connection: 93 statement: 999 resultset: 0
2017-04-16 00:51:32.642 QUERY created: Sun Apr 16 00:51:32 CST 2017 duration: 2 connection: 93 statement: 999 resultset: 0 message: SET character_set_results = NULL
2017-04-16 00:51:32.643 FETCH created: Sun Apr 16 00:51:32 CST 2017 duration: 0 connection: 93 statement: 999 resultset: 0
2017-04-16 00:51:32.645 QUERY created: Sun Apr 16 00:51:32 CST 2017 duration: 0 connection: 93 statement: 999 resultset: 0 message: SET autocommit=1
2017-04-16 00:51:32.646 FETCH created: Sun Apr 16 00:51:32 CST 2017 duration: 0 connection: 93 statement: 999 resultset: 0
2017-04-16 00:51:32.667 QUERY created: Sun Apr 16 00:51:32 CST 2017 duration: 1 connection: 94 statement: 2 resultset: 2 message: /* mysql-connector-java-6.0.6 ( Revision: 3dab84f4d9bede3cdd14d57b99e9e98a02a5b97d ) */SELECT @@session.auto_increment_increment AS auto_increment_increment, @@character_set_client AS character_set_client, @@character_set_connection AS character_set_connection, @@character_set_results AS character_set_results, @@character_set_server AS character_set_server, @@init_connect AS init_connect, @@interactive_timeout AS interactive_timeout, @@license AS license, @@lower_case_table_names AS lower_case_table_names, @@max_allowed_packet AS max_allowed_packet, @@net_buffer_length AS net_buffer_length, @@net_write_timeout AS net_write_timeout, @@query_cache_size AS query_cache_size, @@query_cache_type AS query_cache_type, @@sql_mode AS sql_mode, @@system_time_zone AS system_time_zone, @@time_zone AS time_zone, @@tx_isolation AS tx_isolation, @@wait_timeout AS wait_timeout
以上所述是小編給大家介紹的Spring Boot數據庫鏈接池配置方法，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對網站的支持！
