增加连接池示例

lab-19/lab-19-datasource-pool-hikaricp-single/pom.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-19-datasource-pool-hikaricp-single</artifactId>
+
+    <dependencies>
+        <!-- 实现对数据库连接池的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+        <dependency> <!-- 本示例，我们使用 MySQL -->
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>5.1.48</version>
+        </dependency>
+
+        <!-- 方便等会写单元测试 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

lab-19/lab-19-datasource-pool-hikaricp-single/src/main/java/cn/iocoder/springboot/lab19/datasourcepool/Application.java

@@ -0,0 +1,33 @@
+package cn.iocoder.springboot.lab19.datasourcepool;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class Application implements CommandLineRunner {
+
+    @Autowired
+    private DataSource dataSource;
+
+    public static void main(String[] args) {
+        // 启动 Spring Boot 应用
+        SpringApplication.run(Application.class, args);
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        try (Connection conn = dataSource.getConnection()) {
+            // 这里，可以做点什么
+            System.out.println("连接：" + conn.getClass());
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

lab-19/lab-19-datasource-pool-hikaricp-single/src/main/resources/application.yaml

@@ -0,0 +1,12 @@
+spring:
+  # datasource 数据源配置内容，对应 DataSourceProperties 配置属性类
+  datasource:
+    url: jdbc:mysql://127.0.0.1:3306/test?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    driver-class-name: com.mysql.jdbc.Driver
+    username: root # 数据库账号
+    password: # 数据库密码
+    # HikariCP 自定义配置，对应 HikariConfig 配置属性类
+    hikari:
+      minimum-idle: 10 # 池中维护的最小空闲连接数，默认为 10 个。
+      maximum-pool-size: 10 # 池中最大连接数，包括闲置和使用中的连接，默认为 10 个。
+

lab-19/pom.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>labs-parent</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-19</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>lab-18-hikaricp-single</module>
+        <module>lab-18-datasource-pool-hikaricp-single</module>
+        <module>lab-19-datasource-pool-hikaricp-single</module>
+    </modules>
+
+
+</project>

pom.xml

@@ -27,6 +27,7 @@
         <module>lab-16</module>
         <module>lab-17</module>
         <module>lab-18</module>
+        <module>lab-19</module>
     </modules>