0

我有一个简单的 HQL 查询,我正在尝试执行以返回日期列表。我的映射将日期定义为日历。映射插入可以毫无问题地成功插入,并使用映射回其属性的正确数据值进行检索。例子:

@Entity
@org.hibernate.annotations.Proxy(lazy = false)
@Table(name = "TABLE_T")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Table {
  @Column(name = "SOME_ID", nullable = false)
  private Long stdIdNum = null;

  @Column(name = "END_DATE", nullable = true)
  private Calendar endDate;

但是,如果我执行以下 HQL 语句:

Query query = hsession.createQuery("select endDate from Table");
results = query.list();

我得到以下异常:

java.lang.IllegalStateException:节点没有数据类型:org.hibernate.hql.internal.ast.tree.IdentNode -[IDENT] IdentNode:'end_date' {originalText=end_date}

在 org.hibernate.hql.internal.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.java:154) 在 org.hibernate.hql.internal.ast.HqlSqlWalker.useSelectClause(HqlSqlWalker.java:865) 在 org.hibernate.hql .internal.ast.HqlSqlWalker.processQuery(HqlSqlWalker.java:650) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:651) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement (HqlSqlBaseWalker.java:287) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:235) 在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:248) 在org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183) 在 org.hibernate.hql.internal.ast.QueryTranslatorImpl。在 org.hibernate.engine.query.spi.HQLQueryPlan.(HQLQueryPlan.java:101) 在 org.hibernate.engine.query.spi.HQLQueryPlan.(HQLQueryPlan.java:80) 在 org.hibernate.engine.query.spi.HQLQueryPlan.(HQLQueryPlan.java:101) 编译(QueryTranslatorImpl.java:136) .hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:119) 在 org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:214) 在 org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java :192) 在 org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1537) 在AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:214) 在 org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:192) 在 org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1537) 在AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:214) 在 org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:192) 在 org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1537) 在

我显然正在使用带有 sqlite 后端 sqlite-jdbc-3.7.2.jar 的休眠版本 4.0.0。这是我的 SQLDialect:

import java.sql.Types;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.DateType;
import org.hibernate.type.IntegerType;

public class SQLiteDialect extends Dialect {
    public SQLiteDialect() {
        super();

        registerColumnType(Types.BIT, "integer");
        registerColumnType(Types.TINYINT, "tinyint");
        registerColumnType(Types.SMALLINT, "smallint");
        registerColumnType(Types.INTEGER, "integer");
        registerColumnType(Types.BIGINT, "bigint");
        registerColumnType(Types.FLOAT, "float");
        registerColumnType(Types.REAL, "real");
        registerColumnType(Types.DOUBLE, "double");
        registerColumnType(Types.NUMERIC, "numeric");
        registerColumnType(Types.DECIMAL, "decimal");
        registerColumnType(Types.CHAR, "char");
        registerColumnType(Types.VARCHAR, "varchar");
        registerColumnType(Types.LONGVARCHAR, "longvarchar");
        registerColumnType(Types.DATE, "date");
        registerColumnType(Types.TIME, "time");
        registerColumnType(Types.TIMESTAMP, "longvarchar");
        registerColumnType(Types.BINARY, "blob");
        registerColumnType(Types.VARBINARY, "blob");
        registerColumnType(Types.LONGVARBINARY, "blob");
        // registerColumnType(Types.NULL, "null");
        registerColumnType(Types.BLOB, "blob");
        registerColumnType(Types.CLOB, "clob");
        registerColumnType(Types.BOOLEAN, "integer");
        registerColumnType(Types.NULL, "null");
        registerHibernateType(Types.NULL, "null");


        registerFunction("concat", new VarArgsSQLFunction(IntegerType.INSTANCE, "",
            "||", ""));
        registerFunction("mod", new SQLFunctionTemplate(IntegerType.INSTANCE,
                "?1 % ?2"));
        registerFunction("substr", new StandardSQLFunction("substr",
            IntegerType.INSTANCE));
        registerFunction("substring", new StandardSQLFunction("substr",
            IntegerType.INSTANCE));

        registerFunction("replace", new StandardSQLFunction("replace",
            IntegerType.INSTANCE));

        registerFunction( "current_time", new NoArgSQLFunction( "date('now')", DateType.INSTANCE, false ) );
        registerFunction( "current_timestamp", new NoArgSQLFunction( "date('now')", DateType.INSTANCE, false ) );
        registerFunction( "current_date", new NoArgSQLFunction( "date('now')", DateType.INSTANCE, false ) );
    }

    @Override
    public boolean supportsIdentityColumns() {
        return true;
    }

    /*
     public boolean supportsInsertSelectIdentity() {
     return true; // As specify in NHibernate dialect
     }
     */

    @Override
    public boolean hasDataTypeInIdentityColumn() {
        return false; // As specify in NHibernate dialect
    }

    /*
     public String appendIdentitySelectToInsert(String insertString) {
     return new StringBuffer(insertString.length()+30). // As specify in NHibernate dialect
     append(insertString).
     append("; ").append(getIdentitySelectString()).
     toString();
     }
     */

    @Override
    public String getIdentityColumnString() {
        // return "integer primary key autoincrement";
        return "integer";
    }

    @Override
    public String getIdentitySelectString() {
        return "select last_insert_rowid()";
    }

    @Override
    public boolean supportsLimit() {
        return true;
    }

    // Added fix from bug, http://code.google.com/p/hibernate-sqlite/issues/detail?id=1
    @Override
    public boolean bindLimitParametersInReverseOrder() {
        return true;
    }


    @Override
    public String getLimitString(String query, boolean hasOffset) {
        return new StringBuffer(query.length() + 20).append(query).append(
            hasOffset ? " limit ? offset ?" : " limit ?").toString();
    }

    @Override
    public String getLimitString(final String s, final int min, final int max) {
        String limitString = super.getLimitString(s, min, max);

        return limitString;
    }

    @Override
    public boolean supportsTemporaryTables() {
        return true;
    }

    @Override
    public String getCreateTemporaryTableString() {
        return "create temporary table if not exists";
    }

    @Override
    public boolean dropTemporaryTableAfterUse() {
        return false;
    }

    @Override
    public boolean supportsCurrentTimestampSelection() {
        return true;
    }

    @Override
    public boolean isCurrentTimestampSelectStringCallable() {
        return false;
    }

    @Override
    public String getCurrentTimestampSelectString() {
        return "select current_timestamp";
    }

    @Override
    public boolean supportsUnionAll() {
        return true;
    }

    @Override
    public boolean hasAlterTable() {
        return false; // As specify in NHibernate dialect
    }

    @Override
    public boolean dropConstraints() {
        return false;
    }

    @Override
    public String getAddColumnString() {
        return "add column";
    }

    @Override
    public String getForUpdateString() {
        return "";
    }

    @Override
    public boolean supportsOuterJoinForUpdate() {
        return false;
    }

    @Override
    public String getDropForeignKeyString() {
        throw new UnsupportedOperationException(
                "No drop foreign key syntax supported by SQLiteDialect");
    }

    @Override
    public String getAddForeignKeyConstraintString(String constraintName,
        String[] foreignKey, String referencedTable, String[] primaryKey,
        boolean referencesPrimaryKey) {
        throw new UnsupportedOperationException(
                "No add foreign key syntax supported by SQLiteDialect");
    }

    @Override
    public String getAddPrimaryKeyConstraintString(String constraintName) {
        throw new UnsupportedOperationException(
                "No add primary key syntax supported by SQLiteDialect");
    }

    @Override
    public boolean supportsIfExistsBeforeTableName() {
        return true;
    }

    @Override
    public boolean supportsCascadeDelete() {
        return false;
    }
}

更新 - 为什么我不使用日期?

好吧,有两个相关的原因。这是日期和时间概念的一个非常糟糕的实现,它被日历类所取代。

Calendar 类虽然有所改进,但也有很多不足之处,因此对于认真的日期/时间工作,每个人都推荐 JodaTime。在 Java 7 中,可能还会有一个用于日历的替代 API,目前称为 JSR-310。

为什么大多数 java.util.Date 方法都被弃用了?

4

2 回答 2

0

我没有查看您的 SQLDialect,但您是否尝试过使用 Date 而不是 Calendar

private Calendar endDate

private Date endDate

我记得 java.util.date 曾经与 hibernate 一起工作,但 java.sql.date 不是。这可能是解决方案。在异常中,它显示 end_date,因此这意味着它正在从您的注释中读取,但在数据库级别您遇到了问题。

于 2012-10-03T18:17:00.727 回答
0

您可以用作java.util.Date参考(实际上对象可能来自java.sql包)。并使用@Temporal (TemporalType.TIMESTAMP)例如,如果它是数据库表中的时间戳。

如果它是日期类型,它应该如下所示 -

@Temporal (TemporalType.DATE)
@Column(name = "END_DATE", nullable = true) 
private Date endDate; 

更新(根据您的评论)

select t.endDate from Table as t
于 2012-10-03T18:18:26.243 回答