Spring Boot数据库链接池配置方法

配置方法

基于当前的1.5.2.release的spring boot。

依照官方文档，如果增加了如下依赖的配置，或者类路径中存在spring-boot-starter-jdbc的jar，那么已默认启用了数据库链接池。

 <dependency>
  <groupid>org.springframework.boot</groupid>
  <artifactid>spring-boot-starter-jdbc</artifactid>
 </dependency>

spring boot选择数据库链接池实现的判断逻辑：

1.检查tomcat的数据库链接池实现是否可用，如可用，则启用。使用spring.datasource.tomcat.*可以控制链接池的行为。

2.检查hikaricp是否可用，如可用，则启用。使用spring.datasource.hikari.*可以控制链接池的行为。

3.检查commons dbcp是否可用，如可用，则启用；但spring boot不建议在生产环境使用该链接池的实现。

4.检查commons dbcp2是否可用，如可用，则启用。使用spring.datasource.dbcp2.*可以控制链接池的行为。

使用tomcat-jdbc时，可在application.yml增加配置项spring.datasource.tomcat.*来控制链接池的行为。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驱动类为com.mysql.cj.jdbc.driver
  # 5.x版本的mysql jdbc驱动类为com.mysql.jdbc.driver
  driver-class-name: com.mysql.cj.jdbc.driver
  tomcat:
   max-wait: 10000
   max-active: 30
   test-on-borrow: true
   # 传递mysql jdbc特有的参数
   db-properties:
    logger: net.jackieathome.db.customized.mysqllogger
    gatherperfmetrics: 'true'
    profilesql: 'true'
    reportmetricsintervalmillis: '60000'
    logslowqueries: 'true'
    explainslowqueries: 'true'

    logging:

 level:
  # 关闭其它软件的日志，减少干扰
  org: error
  net: error
  com: error
  # 开启mysql jdbc驱动的日志
  mysql: debug

上述spring.datasource.tomcat.*代表的配置项，可参考tomcat-jdbc的官方文档apache tomcat 8.5 - the tomcat jdbc connection pool或者apache tomcat 8.0 - the tomcat jdbc connection pool。

依据tomcat-jdbc的文档，如需要向数据库的jdbc驱动传入控制参数，可以使用db-properties字段。需要注意的是，当使用mysql驱动时，控制参数的值需要强制转换为字符串，否则创建数据库链接时会报错。配置方法如上述样例中的 reportmetricsintervalmillis: '60000'和logslowqueries: 'true'。

依照mysql jdbc驱动文档，可以配置一个日志记录器，用于记录其工作时的输出，如下是实现样例。

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);
  }
}

同时修改application.yml，增加相应的日志配置，如下。

logging:
  level:
    # 开启mysql jdbc驱动的日志
    mysql: debug

如下是mysql jdbc驱动输出的样例日志。

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

以上所述是小编给大家介绍的spring boot数据库链接池配置方法，希望对大家有所帮助