修复 Spring Boot 中存储过程之间的转换问题

Posted 2023-03-23

【中文标题】修复 Spring Boot 中存储过程之间的转换问题

【英文标题】：Fix casting issue between stored procedure in spring boot

【发布时间】：2020-03-12 13:09:19

【问题描述】：

我正在编写一个 Spring Boot 应用程序，我在我的代码中合并了一个存储过程。我有一个有 8 列的实体类，我有一个存储过程，它接受一个参数并从该实体类传回 3 个列。但是，当我调用存储过程时，它会抛出一个java.land.ClassCastException。我尝试通过将resultClasses 添加到存储过程来解决此问题，但是当我运行该代码时，它失败了，因为它说我正在使用所有 8 个列名。所以我不确定这是因为存储过程问题还是因为我在 Java 代码中实现错误。当我这么说时，我的意思是我认为我选错了。

存储过程：

@Entity
@NamedStoredProcedureQueries(value = 
        @NamedStoredProcedureQuery(name = "procedure-edit",
                procedureName = "GetQueryConf",
                resultClasses = AppSelectorTier.class), 

        @NamedStoredProcedureQuery(name= "procedure-getTierType",
        procedureName= "GetTierTypeByObj",
        //resultClasses = AppSelectorTier.class,
        parameters= 
                @StoredProcedureParameter(mode= ParameterMode.IN, name= "taddm_obj", type= String.class),                
        ),



)

public class AppSelectorTier implements java.io.Serializable 

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "tiername")
    private String tiername;

    @Column(name = "system")
    private String system;

    @Column(name = "mqllisting1")
    private String mqllisting1;

    @Column(name = "mqllisting2")
    private String mqllisting2;

    @Column(name = "tagname_one")
    private String tagname_one;

    @Column(name = "tagname_two")
    private String tagname_two;

    @Column(name = "parseinstruction")
    private String parseinstruction;

    @Column(name = "taddmobj")
    private String taddmobj;

    // Constructor
    public AppSelectorTier(String tiername, String system, String mqllisting1, String mqllisting2, String tagname_one,
            String tagname_two, String parseinstruction, String taddmobj) 
        super();
        this.tiername = tiername;
        this.system = system;
        this.mqllisting1 = mqllisting1;
        this.mqllisting2 = mqllisting2;
        this.tagname_one = tagname_one;
        this.tagname_two = tagname_two;
        this.parseinstruction = parseinstruction;
        this.taddmobj = taddmobj;
    


    public AppSelectorTier(String tiername, String system,String tagname_two) 
        super();
        this.tiername = tiername;
        this.system = system;
        this.tagname_two = tagname_two;
    






    // Default Constructor
    public AppSelectorTier() 

    

    // Getters

    public String getTiername() 
        return tiername;
    

    public String getSystem() 
        return system;
    

    public String getMqllisting1() 
        return mqllisting1;
    

    public String getMqllisting2() 
        return mqllisting2;
    

    public String getTagname_one() 
        return tagname_one;
    

    public String getTagname_two() 
        return tagname_two;
    

    public String getParseinstruction() 
        return parseinstruction;
    

    public String getTaddmobj() 
        return taddmobj;
    

    // Setters

    public void setTiername(String tiername) 
        this.tiername = tiername;
    

    public void setSystem(String system) 
        this.system = system;
    

    public void setMqllisting1(String mqllisting1) 
        this.mqllisting1 = mqllisting1;
    

    public void setMqllisting2(String mqllisting2) 
        this.mqllisting2 = mqllisting2;
    

    public void setTagname_one(String tagname_one) 
        this.tagname_one = tagname_one;
    

    public void setTagname_two(String tagname_two) 
        this.tagname_two = tagname_two;
    

    public void setParseinstruction(String parseinstruction) 
        this.parseinstruction = parseinstruction;
    

    public void setTaddmobj(String taddmobj) 
        this.taddmobj = taddmobj;
    



    @Override
    public String toString() 
        return "AppSelectorTier [tiername=" + tiername + ", system=" + system + ", mqllisting1=" + mqllisting1
                + ", mqllisting2=" + mqllisting2 + ", tagname_one=" + tagname_one + ", tagname_two=" + tagname_two
                + ", parseinstruction=" + parseinstruction + ", taddmobj=" + taddmobj + "]";
    

procedureName= "GetTierTypeByObj" 此过程仅返回 tiername、system 和 tagname_two

服务层：

@SuppressWarnings("unchecked")
        public List<AppSelectorTier> getTierTypeFromObj(String parameter) 
            StoredProcedureQuery storedProcedure = entityManager.createNamedStoredProcedureQuery("procedure-getTierType").setParameter("taddm_obj", parameter);
            return storedProcedure.getResultList(); 
        

Java 实现：

            if (joinQueryService.getTierTypeFromObj("WebService").size() != 0) 
                AppSelectorTier selectorObj = joinQueryService.getTierTypeFromObj("WebService").get(0);
                System.out.println("Tiername: " + selectorObj.getTiername());
                System.out.println("System: " + selectorObj.getSystem());
                System.out.println("Tagname two: " + selectorObj.getTagname_two());

                current.getQuery();
                current.setTier(selectorObj.getTiername());
             else 
                temp = "";
                current.getQuery();
                current.setTier("");

            

错误：

java.lang.ClassCastException: java.base/[Ljava.lang.Object; cannot be cast to com.UPS.entity.AppSelectorTier

【问题讨论】：

//resultClasses = AppSelectorTier.class

【参考方案1】：

你可能错过了：

//resultClasses = AppSelectorTier.class

尝试取消注释。 如果不指定类，则返回 Object 类型。 设置：

resultClasses = AppSelectorTier.class,

【讨论】：

我撤消了评论，现在它说，mqllisting1 是无效列。

检查这个：***.com/questions/7260487/…