检索匿名PLSQL块结果

Question

我在检索Java中匿名PLSQL块的结果时遇到了一些麻烦。

这是块：

DECLARE
in_cnt_date DATE := '&1';
hv_cnt_id NUMBER := 0;
BEGIN
DBMS_OUTPUT.ENABLE (NULL);
INSERT INTO dt_contexts
(CNT_ID, CNT_CONTEXT, CNT_TYPE, CNT_SOURCE, CNT_COMMENT, CNT_DATE, CNT_DATE_INSERT, CNT_DATE_UPDATE)
VALUES
(0, 'EPE_CONTEXT', 'ROUTE', 'bdd', 'Built from ROUTE', in_cnt_date, SYSDATE, SYSDATE);

SELECT SEQ_DT_CNT_ID.CURRVAL
INTO hv_cnt_id
FROM DUAL;
EXCEPTION WHEN OTHERS THEN RAISE ;
END;

我把查询放在一个字符串中：

public static final String CONTEXT = "DECLARE in_cnt__date DATE := '&1'; " +
"hv_cnt_id NUMBER := 0; " +
"BEGIN DBMS_OUTPUT.ENABLE (NULL); " +
"INSERT INTO dt_contexts (CNT_ID, CNT_CONTEXT, CNT_TYPE, CNT_SOURCE, CNT_COMMENT, CNT_DATE, CNT_DATE_INSERT, CNT_DATE_UPDATE) " +
"VALUES (0, 'EPE_CONTEXT', 'ROUTE', 'bdd', 'Built from ROUTE', ?, SYSDATE, SYSDATE); " +
"SELECT SEQ_DT_CNT_ID.CURRVAL INTO hv_cnt_id FROM DUAL; " +
"EXCEPTION WHEN OTHERS THEN RAISE ; END;";

那字符串正确吗？

尝试检索的方法hv_cnt_id：

public int getContextId(Connection conn) throws Exception {
    CallableStatement cs = null;
    ResultSet rs = null;
    int contextId = 0;
    try {
        conn.setAutoCommit(false);
        cs = conn.prepareCall(CONTEXT);
        cs.setDate(1, (java.sql.Date) Route.datePrf);

        cs.execute();
        contextId = (Integer) cs.getObject(1);

        conn.commit();
    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    } finally {
        close(rs, cs);
    }
    return contextId;
}

当我收到此消息时，它不起作用：

java.sql.SQLException: ORA-01858: a non-numeric character was found where a numeric was expected ORA-06512: at line 1

那我该如何找回hv_cnt_id呢？

Answer 1

这是因为 隐式
日期转换失败。添加TO_DATE()而不是直接将日期字符串分配给日期变量。如果java.sql.Date使用，TO_DATE()则不需要。

隐式转换通常取决于会话的NLS_DATE_FORMAT。

您in_cnt__date DATE := '&1'的罪魁祸首。&1实际上将尝试转换为日期。因此引发了异常！

public static final String CONTEXT = "DECLARE in_cnt__date DATE := ? ;" +
"hv_cnt_id NUMBER := 0; " +
"BEGIN DBMS_OUTPUT.ENABLE (NULL); " +
"INSERT INTO dt_contexts (CNT_ID, CNT_CONTEXT, CNT_TYPE, CNT_SOURCE, CNT_COMMENT, CNT_DATE, CNT_DATE_INSERT, CNT_DATE_UPDATE) " +
"VALUES (0, 'EPE_CONTEXT', 'ROUTE', 'bdd', 'Built from ROUTE', in_cnt__date, SYSDATE, SYSDATE); " +
"SELECT SEQ_DT_CNT_ID.CURRVAL INTO hv_cnt_id FROM DUAL; " +
"? := hv_cnt_id;
"EXCEPTION WHEN OTHERS THEN RAISE ; END;";

然后，

cs.setDate(1, (java.sql.Date) Route.datePrf);

将设定日期in_cnt__date;

最后，要获取以下内容中的值，hv_cnt_id 以下内容将添加到您的代码PL/SQL块中

"? := hv_cnt_id;"

而从JDBC，我们得到了它，

 cs.setDate(1, (java.sql.Date) Route.datePrf);
 cs.registerOutParameter(2, Types.NUMBER);
 cs.execute();
 contextId = cs.getInt(2);