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n'a pas pu extraire ResultSet

public class DBUtilU {
    private static Session scss;
    private static SessionFactory sfactory;
    static {
        Configuration cfg = new Configuration();
        cfg.addAnnotatedClass(Userdetails.class);
        cfg.addAnnotatedClass(Code.class);
        cfg.addAnnotatedClass(Messages.class);
        cfg.addAnnotatedClass(Comments.class);
        cfg.configure();
        new SchemaExport(cfg);
        sfactory = cfg.buildSessionFactory();
    }
}

public static List<Code> searchCodeTags(String tags) {
    List<Code> codelist = new ArrayList<Code>();
    try {
        scss = sfactory.getCurrentSession();
        scss.beginTransaction();
        String query = "from Code where Tags=" + tags;
        Query queryResult = scss.createQuery(query);
        for(Object c : queryResult.list())
            codelist.add((Code)c);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    return codelist;
}

package UsersProperty;
@Entity
public class Code {
    @Id
    @GeneratedValue
    private int codeId;
    private int Rating;
    private String fileName;
    private String OwnerName;
    private String PrjName;
    private String Tags;
    @ManyToOne()
    @JoinColumn(name="userid")
    private Userdetails userdetails;
    @OneToMany(targetEntity=Comments.class, mappedBy="targetCode")
    private List<Comments> cm;

    public int getRating() {
        return Rating;
    }
    public void setRating(int rating) {
        Rating = rating;
    }

    public List<Comments> getCm() {
        return cm;
    }
    public void setCm(List<Comments> cm) {
        this.cm = cm;
    }
    public String getFileName() {
        return fileName;
    }
    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public String getOwnerName() {
        return OwnerName;
    }
    public void setOwnerName(String ownerName) {
        OwnerName = ownerName;
    }

    public String getPrjName() {
        return PrjName;
    }
    public void setPrjName(String prjName) {
        PrjName = prjName;
    }

    public String getTags() {
        return Tags;
    }
    public void setTags(String tags) {
        Tags = tags;
    }
    public Userdetails getUserdetails() {
        return userdetails;
    }
    public void setUserdetails(Userdetails userdetails) {
        this.userdetails = userdetails;
    }

    public Code(String fileName, String ownerName, String prjName,String tAgs) {
        super();
        this.fileName = fileName;
        OwnerName = ownerName;
        PrjName = prjName;
        Tags=tAgs;
    }
    public Code() {
        super();
    }

    public static List<Code> CodeSearch(String TAGS){
        return DBUtilU.searchCodeTags(TAGS);
    }
}

Console: 

> Hibernate: select code0_.codeId as codeId1_0_, code0_.OwnerName as OwnerNam2_0_, code0_.PrjName as PrjName3_0_, code0_.Rating as Rating4_0_, code0_.Tags as Tags5_0_, code0_.fileName as fileName6_0_, code0_.userid as userid7_0_ from Code code0_ where code0_.Tags=Overloading
Jun 17, 2013 8:38:05 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 0, SQLState: 42703
Jun 17, 2013 8:38:05 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: ERROR: column "overloading" does not exist
  Position: 252
org.hibernate.exception.SQLGrammarException: could not extract ResultSet
  at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.Java:123)
  at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.Java:49)
  at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.Java:125)
  at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.Java:110)
  at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.Java:61)
  at org.hibernate.loader.Loader.getResultSet(Loader.Java:2036)
  at org.hibernate.loader.Loader.executeQueryStatement(Loader.Java:1836)
  at org.hibernate.loader.Loader.executeQueryStatement(Loader.Java:1815)
  at org.hibernate.loader.Loader.doQuery(Loader.Java:899)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.Java:341)
  at org.hibernate.loader.Loader.doList(Loader.Java:2522)
  at org.hibernate.loader.Loader.doList(Loader.Java:2508)
  at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.Java:2338)
  at org.hibernate.loader.Loader.list(Loader.Java:2333)
  at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.Java:490)
  at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.Java:355)
  at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.Java:195)
  at org.hibernate.internal.SessionImpl.list(SessionImpl.Java:1269)
  at org.hibernate.internal.QueryImpl.list(QueryImpl.Java:101)
  at DB.DBUtilU.searchCodeTags(DBUtilU.Java:117)
  at UsersProperty.Code.CodeSearch(Code.Java:90)
  at Test.Main.main(Main.Java:34)
Caused by: org.postgresql.util.PSQLException: ERROR: column "overloading" does not exist
  Position: 252
  at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.Java:2157)
  at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.Java:1886)
  at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.Java:255)
  at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.Java:555)
  at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.Java:417)
  at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.Java:302)
  at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.Java:56)
  ... 17 more

Problème:

Cela se produit lorsque j'exécute la fonction searchCodeTags de la classe DBUtilU. Que se passe-t-il ici?

javahibernatepostgresqlresultset
7
A.R.H

Modifiez votre requête comme ci-dessous:

String query = "from Code where Tags='" + tags+"'";

Sinon comme ci-dessous:

String hql = "from Code where Tags=:tags";
Query query = session.createQuery(hql);
query.setParameter("tags",tags);

La comparaison dans la clause où se fait avec un littéral et non avec une autre colonne. Donc, il doit être soit cité comme dans le premier cas, soit utiliser une variable liée comme dans le deuxième cas.

12
Mubin

Jetez un oeil à votre message d'erreur (je concède que le stacktrace est long, généralement la partie intéressante est près du sommet).

ERREUR: ERREUR: la colonne "surcharge" n'existe pas

from Code code0_ où code0_.Tags = Surcharge

Vous devez citer 'Overloading', car il ne s'agit pas d'un nom de colonne, mais d'une valeur littérale. Mieux encore, définissez-le comme une variable de liaison.

4
Thilo

si vous avez camelCase, JPA convertira alors en Camel_Case et le convertira en minuscule.

0
vaquar khan