配置方法
基于當前的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，那么已默認啟用了數據庫鏈接池。
|
1
2
3
4
|
<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:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
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:
|
1
2
3
4
5
6
7
|
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，用于記錄其工作時的輸出，如下是實現樣例。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
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。
|
1
2
3
4
|
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服務器之家網站的支持！
