Question

我需要在运行时动态生成DB中所有表的INSERT stmt。我正在逐个获取表内容（数据）并在运行时确定列类型，同时循环通过ResultSet＆amp; ResultSetMetaData是为String类型添加Double Quotes（“）而不为非String类型的列添加相同的。但是当实现当前逻辑时，它会忽略第一条记录，并且对表中的所有剩余记录都可以正常工作。知道为什么它正在工作，因为在获取rs.getColumnType(int columnIndex)时我们需要给出从1索引开始的列名。但是不能构建逻辑以便它将检查第一行而不是忽略它时刻..

请参阅下面的代码段

if (rs != null) {
    while (rs.next()) {
        sqlString = new StringBuffer();

        for (int i = 1; i <= columnCount; i++) {
            Object obj = rs.getObject(i);

            if (obj == null) {
                sqlString.append("null");
                sqlString.append(",");
            }
            else
            {
                int sqlTypes = rsmd.getColumnType(i);

                switch (sqlTypes) {
                    case Types.VARCHAR:
                        sqlString.append("\"");
                        if (obj != null)
                            sqlString.append(rs.getString(i));

                        sqlString.append("\"");
                        sqlString.append(",");
                        break;
                    case Types.NULL:
                        sqlString.append("null");
                        sqlString.append(",");
                        break;
                    case Types.CHAR:
                        sqlString.append("\"");
                        if (obj != null)
                            sqlString.append(rs.getString(i));

                        sqlString.append("\"");
                        sqlString.append(",");
                        break;
                    case Types.TIMESTAMP:
                        sqlString.append("\"");
                        if (obj != null)
                            sqlString.append(rs.getTimestamp(i));

                        sqlString.append("\"");
                        sqlString.append(",");
                        break;
                    case Types.DOUBLE:
                        if (obj != null)
                            sqlString.append(rs.getDouble(i));

                        sqlString.append(",");
                        break;
                    case Types.INTEGER:
                        if (obj != null)
                            sqlString.append(rs.getInt(i));

                        sqlString.append(",");
                        break;
                    case Types.SMALLINT:
                        if (obj != null)
                            sqlString.append(rs.getInt(i));

                        sqlString.append(",");
                        break;
                    case Types.DECIMAL:
                        if (obj != null)
                            sqlString.append(rs.getBigDecimal(i));

                        sqlString.append(",");
                        break;

                    /*default:
                        if (obj != null)
                            sqlString.append(obj.toString());

                        sqlString.append(",");
                        break;*/
                }
            }
        }

Answer 1

您是否尝试过使用do while循环：

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如何动态确定ResultSet列类型

1 个答案: