【GVA】gorm多对多关联使用Preload带出关联表中的数据

分手后的思念是犯贱 2023-10-01 15:29 74阅读 0赞

`db.Limit(limit).Offset(offset).Preload("BusinessSystemList").Find(&projectManagements).Error`

// GetProjectManagementInfoList 分页获取ProjectManagement记录
    // Author [piexlmax](https://github.com/piexlmax)
    func (projectManagementService *ProjectManagementService) GetProjectManagementInfoList(info autoCodeReq.ProjectManagementSearch) (err error, list interface{
        }, total int64) {
        
    	limit := info.PageSize
    	offset := info.PageSize * (info.Page - 1)
    	// 创建db
    	db := global.GVA_DB.Model(&autocode.ProjectManagement{
        })
    	var projectManagements []autocode.ProjectManagement
    	// 如果有条件搜索 下方会自动创建搜索语句
    	if info.ProjectName != "" {
        
    		db = db.Where("`project_name` LIKE ?", "%"+info.ProjectName+"%")
    	}
    	if info.ProjectDesc != "" {
        
    		db = db.Where("`project_desc` LIKE ?", "%"+info.ProjectDesc+"%")
    	}
    	if info.ProjectManager != 0 {
        
    		db = db.Where("`project_manager` = ?", info.ProjectManager)
    	}
    	if info.CustomerName != "" {
        
    		db = db.Where("`customer_name` LIKE ?", "%"+info.CustomerName+"%")
    	}
    	if info.ProjectStartDate != nil {
        
    		db = db.Where("`project_start_date` = ?", info.ProjectStartDate)
    	}
    	if info.ProjectEndDate != nil {
        
    		db = db.Where("`project_end_date` = ?", info.ProjectEndDate)
    	}
    	err = db.Count(&total).Error
    	if err != nil {
        
    		return
    	}
    	// err = db.Limit(limit).Offset(offset).Find(&projectManagements).Error
    	// 带出businessSystemList
    	err = db.Limit(limit).Offset(offset).Preload("BusinessSystemList").Find(&projectManagements).Error
    	return err, projectManagements, total
    }