Question

当我尝试从Oracle过程中检索对象类型时，我收到了正确的数字，但是这个程序传递给我的所有字符串都是“???”。我的例子：

import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;

import java.sql.Array;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSetMetaData;
import java.sql.Struct;
import java.sql.Types;

public class InitMethod {

    public static void init() throws Exception {
        Class.forName("oracle.jdbc.OracleDriver");
        Connection connection =
                DriverManager.getConnection("jdbc:oracle:thin:@10.0.0.20:1521:dw", "user", "password");

        final String typeName = "T_DEMO_OBJECT";
        final String typeTableName = "T_DEMO_OBJECTS";

        final StructDescriptor structDescriptor = StructDescriptor.createDescriptor(typeName.toUpperCase(), connection);
        final ResultSetMetaData metaData = structDescriptor.getMetaData();

        CallableStatement cs = connection.prepareCall("{call p_generate_demo_objects(?, ?)}");
        cs.setInt(1, 7);

        cs.registerOutParameter(2, Types.ARRAY, typeTableName);
        cs.execute();

        Object[] data = (Object[]) ((Array) cs.getObject(2)).getArray();
        for (Object tmp : data) {
            Struct row = (Struct) tmp;

            int idx = 1;
            for (Object attribute : row
                    .getAttributes()) {
                System.out.println(metaData.getColumnName(idx) + " = " + attribute);
                ++idx;
            }
            System.out.println("---");
        }
        cs.close();
}

我收到正确的数字，但所有字符串都是“???”：

SOME_NUMBER = 1 SOME_STRING = ???

SOME_NUMBER = 2 SOME_STRING = ???

可能是什么问题？

（我使用ojdbc6.jar）

Answer 1

当您在类路径中不包含orai18n.jar且数据库字符集不在此列表中时，会发生这种情况：ASCII，UTF8或ISOLATIN1。所有字符都替换为“替换字符”，即“？”。你可以从OTN下载orai18n.jar（在谷歌搜索“oracle jdbc download”）。

Answer 2

In my company, we have columns of PII data in certain Oracle database schema that are redacted and replaced by a custom string. It seems likely that the '???' sequence to be a data redaction in the table. You might check with your DB Admin to see if this is the case.

所有字符串都是“???”从Oracle中检索对象类型的表

2 个答案: