今天在调MyBatis-Plus Generator时，遇到一个奇怪的问题：我配置了表信息，断点调试的时候发现获取的tableInfo信息时，长度总为零。我敏锐的感觉到是数据库配置出现了问题。MyBatis-Plus Generator没有报任何错误，我使用PostgreSQL的经验比较少，很难定位到问题的原因，所以我决定用JdbcTemplate调试代码。
pom.xml文件如下，我基本上没怎么动，就是使用SpringBoot初始化器初始出一份代码，然后加上Generator相关的代码：
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<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>fun.junjie</groupId>
<artifactId>mybatisplus-code-generator</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybatisplus-code-generator</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.3.7.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.18</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.31</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.7.RELEASE</version>
<configuration>
<mainClass>fun.junjie.mybatisplus.code.generator.MybatisplusCodeGeneratorApplication</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
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application.properties代码如下
spring.application.name=mybatisplus-code-generator
server.port=8888
spring.datasource.url=jdbc:postgresql://192.168.19.12:5432/dyf?currentSchema=dyf&stringtype=unspecified
spring.datasource.username=postgres
spring.datasource.password=dev.DB
spring.datasource.driver-class-name=org.postgresql.Driver
这份配置文件中有很多地方需要了解一下：我们数据库结构为：dyf库下的dyf模式。如果在配置的时候不加currentSchema=dyf，则无法检索出目标表。
测试代码如下：
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package fun.junjie.mybatisplus.code.generator.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
/**
* @author wujj
*/
@RestController
public class TestController {
@Autowired
private JdbcTemplate jdbcTemplate;
@GetMapping("test")
public void test() {
Map<String, Object> stringObjectMap = jdbcTemplate.queryForMap("select * from t_dyf_app");
System.out.println("");
}
}
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整个实验环境让我花费时间最多的就是，找到currentSchema=dyf配置。在使用该配置前，我尝试了使用spring.datasource.scheme=dyf配置，结果无法正常启动。
该配置在测试环境能正常运行了，但是在我做MyBatis-Plus Generator时，依旧没有作用。在MyBatis-Plus Generator中，需要在DataSourceConfig配置中通过setSchemaName指定dyf模式。因为我后来决定不使用MyBatis-Plus Generator，而是自己开发一个该工具，所以我暂时放弃了对该技术的研究。