Druid資料庫連線池

摘要： Druid首先是一個資料庫連線池。Druid是目前最好的資料庫連線池，在功能、效能、擴充套件性方面，都超過其他資料庫連線池，包括DBCP、C3P0、BoneCP、Proxool、JBoss DataSource。Druid已經在阿里巴巴部署了超過600個應用，經過一年多生產環境大規模部署的嚴苛...

Druid首先是一個資料庫連線池。Druid是目前最好的資料庫連線池，在功能、效能、擴充套件性方面，都超過其他資料庫連線池，包括DBCP、C3P0、BoneCP、Proxool、JBoss DataSource。Druid已經在阿里巴巴部署了超過600個應用，經過一年多生產環境大規模部署的嚴苛考驗。

Druid是一個JDBC元件，它包括三個部分：

1.基於Filter－Chain模式的外掛體系。

2.DruidDataSource 高效可管理的資料庫連線池。

3.SQLParser

所以Druid可以：

1、充當資料庫連線池。

2、可以監控資料庫訪問效能

3、獲得SQL執行日誌

Spring Boot 配置Druid資料庫連線池並檢視資料庫資訊

maven:

<!-- druid資料庫連線池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>

config

#開發配置
spring:
profiles: dev
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
driver-class-name: com.mysql.jdbc.Driver
platform: mysql
url: jdbc:mysql://xxx/bu_wang?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: xxx
password: xxx
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT1FROMDUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
filters: stat,wall,log4j
logSlowSql: true

DruidConfig.java

import java.sql.SQLException;
import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;

@Configuration
public class DruidConfig {

private static final Logger logger = LoggerFactory.getLogger(DruidConfig.class);

private static final String DB_PREFIX = "spring.datasource";

@Bean
public ServletRegistrationBean druidServlet() {
logger.info("init Druid Servlet Configuration ");
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
// IP白名單
servletRegistrationBean.addInitParameter("allow", "*");
// IP黑名單(共同存在時，deny優先於allow)
servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
//控制檯管理使用者
servletRegistrationBean.addInitParameter("loginUsername", "admin");
servletRegistrationBean.addInitParameter("loginPassword", "admin");
//是否能夠重置資料 禁用HTML頁面上的“Reset All”功能
servletRegistrationBean.addInitParameter("resetEnable", "false");
return servletRegistrationBean;
}

@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}

//解決 spring.datasource.filters=stat,wall,log4j 無法正常註冊進去
@ConfigurationProperties(prefix = DB_PREFIX)
class IDataSourceProperties {
private String url;
private String username;
private String password;
private String driverClassName;
private int initialSize;
private int minIdle;
private int maxActive;
private int maxWait;
private int timeBetweenEvictionRunsMillis;
private int minEvictableIdleTimeMillis;
private String validationQuery;
private boolean testWhileIdle;
private boolean testOnBorrow;
private boolean testOnReturn;
private boolean poolPreparedStatements;
private int maxPoolPreparedStatementPerConnectionSize;
private String filters;
private String connectionProperties;

@Bean//宣告其為Bean例項
@Primary//在同樣的DataSource中，首先使用被標註的DataSource
public DataSource dataSource() {
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(url);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName);

//configuration
datasource.setInitialSize(initialSize);
datasource.setMinIdle(minIdle);
datasource.setMaxActive(maxActive);
datasource.setMaxWait(maxWait);
datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
datasource.setValidationQuery(validationQuery);
datasource.setTestWhileIdle(testWhileIdle);
datasource.setTestOnBorrow(testOnBorrow);
datasource.setTestOnReturn(testOnReturn);
datasource.setPoolPreparedStatements(poolPreparedStatements);
datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
try {
datasource.setFilters(filters);
} catch (SQLException e) {
System.err.println("druid configuration initialization filter: " + e);
}
datasource.setConnectionProperties(connectionProperties);
return datasource;
}

public String getUrl() {
return url;
}

public void setUrl(String url) {
this.url = url;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public String getDriverClassName() {
return driverClassName;
}

public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}

public int getInitialSize() {
return initialSize;
}

public void setInitialSize(int initialSize) {
this.initialSize = initialSize;
}

public int getMinIdle() {
return minIdle;
}

public void setMinIdle(int minIdle) {
this.minIdle = minIdle;
}

public int getMaxActive() {
return maxActive;
}

public void setMaxActive(int maxActive) {
this.maxActive = maxActive;
}

public int getMaxWait() {
return maxWait;
}

public void setMaxWait(int maxWait) {
this.maxWait = maxWait;
}

public int getTimeBetweenEvictionRunsMillis() {
return timeBetweenEvictionRunsMillis;
}

public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {
this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
}

public int getMinEvictableIdleTimeMillis() {
return minEvictableIdleTimeMillis;
}

public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {
this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
}

public String getValidationQuery() {
return validationQuery;
}

public void setValidationQuery(String validationQuery) {
this.validationQuery = validationQuery;
}

public boolean isTestWhileIdle() {
return testWhileIdle;
}

public void setTestWhileIdle(boolean testWhileIdle) {
this.testWhileIdle = testWhileIdle;
}

public boolean isTestOnBorrow() {
return testOnBorrow;
}

public void setTestOnBorrow(boolean testOnBorrow) {
this.testOnBorrow = testOnBorrow;
}

public boolean isTestOnReturn() {
return testOnReturn;
}

public void setTestOnReturn(boolean testOnReturn) {
this.testOnReturn = testOnReturn;
}

public boolean isPoolPreparedStatements() {
return poolPreparedStatements;
}

public void setPoolPreparedStatements(boolean poolPreparedStatements) {
this.poolPreparedStatements = poolPreparedStatements;
}

public int getMaxPoolPreparedStatementPerConnectionSize() {
return maxPoolPreparedStatementPerConnectionSize;
}

public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {
this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
}

public String getFilters() {
return filters;
}

public void setFilters(String filters) {
this.filters = filters;
}

public String getConnectionProperties() {
return connectionProperties;
}

public void setConnectionProperties(String connectionProperties) {
this.connectionProperties = connectionProperties;
}
}

}

執行之後訪問： ofollow,noindex">http://localhost:8080/druid/index.html

通過配置的賬號密碼登入可以檢視資料庫被檢視次數等資訊。