use h2

Author: Snailclimb

source-code/basis/jpa-demo/pom.xml

@@ -32,6 +32,11 @@
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
         </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>

source-code/basis/jpa-demo/src/main/resources/application.properties

@@ -1,14 +1,20 @@
-spring.datasource.url=jdbc:mysql://localhost:3306/springboot_jpa?useSSL=false&serverTimezone=CTT
+# 数据库url地址
+spring.datasource.url=jdbc:h2:mem:jpa-demo
 spring.datasource.username=root
 spring.datasource.password=123456
+spring.datasource.platform=h2
+spring.datasource.driverClassName =org.h2.Driver
+
+spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true
 # 打印出 sql 语句
 spring.jpa.show-sql=true
 #常用的有四种：
 # 1.create:每次重新启动项目都会重新创新表结构，会导致数据丢失
 # 2.create-drop:每次启动项目创建表结构，关闭项目删除表结构
 # 3.update:每次启动项目会更新表结构
 # 4. validate:验证表结构，不对数据库进行任何更改
-spring.jpa.hibernate.ddl-auto=create
+spring.jpa.hibernate.ddl-auto=update
 spring.jpa.open-in-view=false
-# 创建的表的 ENGINE 为 InnoDB
-spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL55Dialect
+server.port=8080
+#H2控制台
+spring.h2.console.enabled=true

source-code/basis/springboot-handle-exception-improved/.idea/modules/webApp.main.iml

@@ -1,5 +1,5 @@
 plugins {
-	id 'org.springframework.boot' version '2.1.9.RELEASE'
+	id 'org.springframework.boot' version '2.1.8.RELEASE'
 	id 'java'
 }
 

source-code/basis/springboot-handle-exception-improved/build.gradle

@@ -0,0 +1,36 @@
+package com.example.helloworld.controller;
+
+import java.util.Date;
+
+/**
+ * 这是一个简单的Runnable类，需要大约5秒钟来执行其任务。
+ * @author shuang.kou
+ */
+public class MyRunnable implements Runnable {
+
+    private String command;
+
+    public MyRunnable(String s) {
+        this.command = s;
+    }
+
+    @Override
+    public void run() {
+        System.out.println(Thread.currentThread().getName() + " Start. Time = " + new Date());
+        processCommand();
+        System.out.println(Thread.currentThread().getName() + " End. Time = " + new Date());
+    }
+
+    private void processCommand() {
+        try {
+            Thread.sleep(5000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public String toString() {
+        return this.command;
+    }
+}

source-code/start/hello-world/src/main/java/com/example/helloworld/controller/BookController.java

@@ -0,0 +1,30 @@
+package com.example.helloworld.controller;
+
+public class Test {
+    public Test() {
+        System.out.print("默认构造方法！--");
+    }
+
+    //非静态代码块
+    {
+        System.out.print("非静态代码块！--");
+    }
+
+    //静态代码块
+    static {
+        System.out.print("静态代码块！--");
+    }
+
+    private static void test() {
+        System.out.print("静态方法中的内容! --");
+        {
+            System.out.print("静态方法中的代码块！--");
+        }
+
+    }
+
+    public static void main(String[] args) {
+        Test test = new Test();
+        Test.test();//静态代码块！--静态方法中的内容! --静态方法中的代码块！--
+    }
+}