Activiti7（二）

Activiti7建表準備工作

一、創建數據庫activiti

二、通過代碼生成Activiti7的表

新建一個maven項目

1、resource下新建配置文件 activiti.cfg.xml
（注：（1）該配置文件是默認配置文件，但是文件名不是固定的，可以自己命名，該文件名在下面第4點，即Java測試類代碼中會根據該文件名讀取文件內容；（2）我用的mysql版本是8.0，所以驅動類名爲com.mysql.cj.jdbc.Driver，如果是低版本，則驅動類名爲com.mysql.jdbc.Driver）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx.xsd">
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/activiti?serverTimezone=Asia/Shanghai" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="processEngineConfiguration"
          class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
        <!-- 數據源 -->
        <property name="dataSource" ref="dataSource" />
        <!-- activiti數據庫表處理策略 -->
        <property name="databaseSchemaUpdate" value="true"/>
    </bean>

</beans>

2、resource下新建配置文件 log4j.properties

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE debug info warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE
# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE
# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

3、pom文件配置

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.itheima.activiti</groupId>
    <artifactId>activiti01</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-engine</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-bpmn-model</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-json-converter</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-bpmn-layout</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.activiti.cloud</groupId>
            <artifactId>activiti-cloud-services-api</artifactId>
            <version>7.0.0.Beta1</version>
        </dependency>
        <!--<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.40</version>
        </dependency>-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

    </dependencies>

    <repositories>
        <repository>
            <id>alfresco</id>
            <name>Activiti Releases</name>
            <url>https://artifacts.alfresco.com/nexus/content/repositories/activiti-releases/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>

</project>

4、新建一個Java測試類

public class ActivitiTest {

    @Test
    public void testGenTable(){
        //1、創建ProcessEngineConfiguration對象,
        ProcessEngineConfiguration configuration = ProcessEngineConfiguration.
                createProcessEngineConfigurationFromResource("activiti.cfg.xml","processEngineConfiguration");
        //2、創建ProcessEngine對象
        ProcessEngine processEngine = configuration.buildProcessEngine();
        //3、輸出processEngine對象
        System.out.println(processEngine);
    }
    
	@Test
    public void testGenTable2(){
        //條件：1、activiti配置文件名稱：activiti.cfg.xml   2、bean的id="processEngineConfiguration"
        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
        System.out.println(processEngine);
    }
}

5、運行測試方法，數據庫表自動生成

6、數據庫表的命名規則
      Activiti的表都以ACT_ 開頭，第二部分是表示表的用途的兩個字母標識，用途也和服務的API對應。
      （1）ACT_RE_：“RE”表示repository，這個前綴的表包含了流程定義和流程靜態資源（圖片、規則等）。
      （2）ACT_RU_：“RU”表示Runtime。這些運行時的表，包含流程實例、任務、變量、異步任務等運行中的數據。Activiti只在流程實例執行過程中保存這些數據，在流程結束時就會刪除這些記錄。這樣運行時表可以一直很小速度很快。
      （3）ACT_HI_：“HI”表示history，這些表包含歷史數據，比如歷史流程實例，變量，任務等等。
      （4）ACT_GE_：“GE”表示general，通用數據，用於不同場景下。