Using Druid for database monitoring in Java API development-javaTutorial-php.cn

Using Druid for database monitoring in Java API development

王林

Release： 2023-06-17 23:18:46

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In the Java API development process, database monitoring is a very important link. It can help us better understand the performance and health of the database, and discover and solve potential problems in a timely manner. Druid is an open source JDBC connection pool and monitoring platform. It is very common to use Druid for database monitoring in Java API development. This article will introduce the basic concepts, configuration methods and common application scenarios of Druid.

1. Introduction to Druid
Druid is an open source, high-performance JDBC connection pool and monitoring platform. It has the following characteristics:

It can realize efficient data source connection pool management and supports multiple data source types.
Using an efficient caching algorithm can greatly improve database operation performance.
Provides a wealth of monitoring indicators and statistical information to facilitate developers to discover and solve problems in a timely manner.
It is highly scalable and configurable and can be flexibly adjusted according to application scenarios.

2. Druid configuration method
To use Druid for database monitoring in Java API development, the following configuration is required:

Introduce Druid related dependencies Bag.
In the Maven project, you can add the following dependencies in the pom.xml file:
```
<dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid</artifactId>
 <version>x.x.x</version>
</dependency>
```
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Among them, x.x.x represents the version number, which can be specified according to the actual situation.

Initialize the Druid data source.
In Java code, the Druid data source can be initialized as follows:

import com.alibaba.druid.pool.DruidDataSource;

// 数据库连接配置信息
String url = "jdbc:mysql://localhost:3306/test";
String username = "root";
String password = "123456";

DruidDataSource dataSource = new DruidDataSource();
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);

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For database monitoring and management, we need to add monitoring functions to the Druid data source, which can be configured as follows:

import com.alibaba.druid.pool.DruidDataSource;

// 数据库连接配置信息
String url = "jdbc:mysql://localhost:3306/test";
String username = "root";
String password = "123456";

DruidDataSource dataSource = new DruidDataSource();
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);

// 监控配置信息
dataSource.setValidationQuery("SELECT 1");
dataSource.setTestWhileIdle(true);
dataSource.setTestOnBorrow(false);
dataSource.setTestOnReturn(false);
dataSource.setPoolPreparedStatements(true);
dataSource.setMaxPoolPreparedStatementPerConnectionSize(20);

// 开启监控
dataSource.setFilters("stat");

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Among them, the setValidationQuery method is used to set the validation SQL, the setTestWhileIdle method is used to set whether to check when idle, setTestOnBorrow and ## The #setTestOnReturn method is used to set whether to verify when taking out or returning a connection, setPoolPreparedStatements and setMaxPoolPreparedStatementPerConnectionSize methods are used to set the size and maximum number of predefined statement pools, ## The #setFilters method is used to enable monitoring functionality.

In Java API development, Druid can be applied to the following scenarios:

Database connection pool management.

SQL monitoring and performance tuning.
Database exception monitoring and processing.

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