iailab-framework/iailab-common-mybatis/src/main/java/com/iailab/framework/mybatis/config/IailabMybatisAutoConfiguration.java

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package com.iailab.framework.mybatis.config;

import cn.hutool.core.util.StrUtil;
import com.iailab.framework.mybatis.core.enums.SqlConstants;
import com.iailab.framework.mybatis.core.handler.DefaultDBFieldHandler;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.core.incrementer.IKeyGenerator;
import com.baomidou.mybatisplus.extension.incrementer.*;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.apache.ibatis.annotations.Mapper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.ConfigurableEnvironment;

/**
 * MyBaits 配置类
 *
 * @author iailab
 */
@AutoConfiguration(before = MybatisPlusAutoConfiguration.class) // 目的：先于 MyBatis Plus 自动配置，避免 @MapperScan 可能扫描不到 Mapper 打印 warn 日志
@MapperScan(value = "${iailab.info.base-package}", annotationClass = Mapper.class,
        lazyInitialization = "${mybatis.lazy-initialization:false}") // Mapper 懒加载，目前仅用于单元测试
public class IailabMybatisAutoConfiguration {

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor()); // 分页插件
        return mybatisPlusInterceptor;
    }

    @Bean
    public MetaObjectHandler defaultMetaObjectHandler(){
        return new DefaultDBFieldHandler(); // 自动填充参数类
    }

    @Bean
    @ConditionalOnProperty(prefix = "mybatis-plus.global-config.db-config", name = "id-type", havingValue = "INPUT")
    public IKeyGenerator keyGenerator(ConfigurableEnvironment environment) {
        DbType dbType = IdTypeEnvironmentPostProcessor.getDbType(environment);
        if (dbType != null) {
            switch (dbType) {
                case POSTGRE_SQL:
                    return new PostgreKeyGenerator();
                case ORACLE:
                case ORACLE_12C:
                    return new OracleKeyGenerator();
                case H2:
                    return new H2KeyGenerator();
                case KINGBASE_ES:
                    return new KingbaseKeyGenerator();
                case DM:
                    return new DmKeyGenerator();
            }
        }
        // 找不到合适的 IKeyGenerator 实现类
        throw new IllegalArgumentException(StrUtil.format("DbType{} 找不到合适的 IKeyGenerator 实现类", dbType));
    }

}