MyBatis-Plus不使用数据库默认值的问题及解决

`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'

        LambdaQueryWrapper<ImKnowledgeSearchRecord> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ImKnowledgeSearchRecord::getKeyword, keyword);
        ImKnowledgeSearchRecord knowledgeSearchRecord = this.getOne(lambdaQueryWrapper, true);
        if (knowledgeSearchRecord == null) {
            knowledgeSearchRecord = new ImKnowledgeSearchRecord();
            knowledgeSearchRecord.setKeyword(keyword);
            knowledgeSearchRecord.setSearchCount(0);
        }        knowledgeSearchRecord.setSearchCount(knowledgeSearchRecord.getSearchCount() + 1);
        // knowledgeSearchRecord.setUpdateTime(null);
this.updateById(knowledgeSearchRecord);

this.getOne(lambdaQueryWrapper, true);

    /**
     * 创建时间（数据库自动生成，无需手动赋值）
     */
    @TableField(insertStrategy = FieldStrategy.NEVER)
    private Date createTime;
    /**
     * 修改时间（数据库自动生成，无需手动赋值）
     */
    @TableField(updateStrategy = FieldStrategy.NEVER)
    private Date updateTime;

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-annotation</artifactId>
            <version>3.2.0</version>
        </dependency>