Question

我正在使用jooq为Oracle构建查询。除日期外，一切正常：

public static void main(String[] args) throws SQLException {
    java.sql.Timestamp now = new java.sql.Timestamp(new Date().getTime());
    Connection con = DriverManager.getConnection(... , ... , ...);
    final Factory create = new OracleFactory(con);
    Statement s = con.createStatement();
    s.execute("create table test_table ( test_column DATE )");
    s.execute("insert into test_table values (to_date('20111111', 'yyyymmdd'))");

    // -- using to_date
    ResultSet rs = s.executeQuery("select count(1) from test_table where test_column<to_date('20121212', 'yyyymmdd')");
    rs.next();
    System.out.println(""+rs.getInt(1));
    rs.close();     

    // -- using a preparedstatement with java.sql.timestamp
    PreparedStatement ps = con.prepareStatement("select count(1) from test_table where test_column<?");
    ps.setTimestamp(1,now);
    rs = ps.executeQuery();
    rs.next();
    System.out.println(""+rs.getInt(1));
    rs.close();

    // -- using jooq with java.sql.timestamp
    final org.jooq.Table<org.jooq.Record> table = create.tableByName("TEST_TABLE");
    final org.jooq.SelectSelectStep sss = create.select(create.count());
    final org.jooq.SelectJoinStep sjs = sss.from(table);
    final org.jooq.SelectConditionStep scs = sjs.where(create.fieldByName("TEST_COLUMN").lessThan(now));
    System.out.println(scs.toString());
    rs = s.executeQuery(scs.toString());
    rs.next();
    System.out.println(""+rs.getInt(1));
    rs.close();

    s.close();

}

提供以下输出：

   1
   1
   select count(*) from "TEST_TABLE" where "TEST_COLUMN" < '2012-12-12 19:42:34.957'
   Exception in thread "main" java.sql.SQLDataException: ORA-01861: literal does not match format string

我原本以为JOOQ会在lessThan（Object）中检查Object的类型确定它是否能够提出合理的转换，但显然是这样在这种情况下只做一个Object.toString（）。我还记得我在MySQL中通过JOOQ从未遇到日期查询问题（虽然这是一段时间了）。我做错了什么？

Answer 1

我怀疑这个问题是由于create.fieldByName()不知道列的类型（因此，对象），并在比较谓词的右侧强制未知类型。这应该在jOOQ中修复。我已为此注册了＃2007： https://github.com/jOOQ/jOOQ/issues/2007

同时，尝试在您的字段上明确设置类型：

create.fieldByName(Timestamp.class, "TEST_COLUMN").lessThan(now)

通过JOOQ比较Oracle DATE列和java.sql.timestamp

1 个答案: