如何在加载.csv文件时将当前系统时间戳插入db2数据库基列

Question

下面的类将.csv导入数据库 table.it 工作正常，现在我需要更新同一表中的另一列，当在数据库表的相应列中执行此程序时，当前系统时间戳需要更新。

示例：在 Db2 表中，“主题”列为：Eng Social Maths TimeStamp

英寸CSV文件只有3列英语社会数学。

当. csv文件导入（使用上述程序）到db2时，除了TimeStamp之外的所有列都会更新。Timestamp被输入以标记. csv文件上传到表的时间。那么，如何同时使用当前系统时间戳更新TimeStamp列。？请帮助

公共类CSVLoader {

private static final 
    String SQL_INSERT = "INSERT INTO OPPTYMGMT.${table}
         (${keys})      VALUES(${values})";

private static final String TABLE_REGEX = "\\$\\{table\\}";

private static final String KEYS_REGEX = "\\$\\{keys\\}";

private static final String VALUES_REGEX = "\\$\\{values\\}";

private Connection connection;

private char seprator;

public CSVLoader(Connection connection) {

    this.connection = connection;

    //Set default separator

    this.seprator = ',';
}

      public void loadCSV(String csvFile, String tableName) throws Exception {

    CSVReader csvReader = null;

    if(null == this.connection) {

        throw new Exception("Not a valid connection.");
    }

    try {

        csvReader = new CSVReader(new FileReader(csvFile), this.seprator);

    } catch (Exception e) {

        e.printStackTrace();

        throw new Exception("Error occured while executing file. "

                   + e.getMessage());

              }

        String[] headerRow = csvReader.readNext();

    if (null == headerRow) {

        throw new FileNotFoundException(


                        "No columns defined in given CSV file." +

                         "Please check the CSV file format.");
    }

    String questionmarks = StringUtils.repeat("?,", headerRow.length);

    questionmarks = (String) questionmarks.subSequence(0, questionmarks

            .length() - 1);


    String query = SQL_INSERT.replaceFirst(TABLE_REGEX, tableName);

    query = query
            .replaceFirst(KEYS_REGEX, StringUtils.join

             (headerRow,   ","));

    query = query.replaceFirst(VALUES_REGEX, questionmarks);

            System.out.println("Query: " + query);

    String[] nextLine;

    Connection con = null;

    PreparedStatement ps = null;

    try {
        con = this.connection;

        con.setAutoCommit(false);

        ps = con.prepareStatement(query);

                       final int batchSize = 1000;

                     int count = 0;

        Date date = null;

        while ((nextLine = csvReader.readNext()) != null) {

            System.out.println( "inside while" );

            if (null != nextLine) {

                int index = 1;

                for (String string : nextLine) {

                    date = DateUtil.convertToDate(string);

        if (null != date) {

                    ps.setDate(index++, new java.sql.Date(date

                    .getTime()));

                     } else {

                  ps.setString(index++, string);

    System.out.println( "string" +string);

                    }

                }

                ps.addBatch();

            }

            if (++count % batchSize == 0) {

                ps.executeBatch();

            }

                     }


        ps.executeBatch(); // insert remaining records

        con.commit();

    } catch (Exception e) {

        con.rollback();

        e.printStackTrace();

        throw new Exception(

        "Error occured while loading data 

                from file                to                      database."

               + e.getMessage());

    } finally {

             if (null != ps)


            ps.close();

        if (null != con)

            con.close();

            System.out.println("csvReader will be closed");

        csvReader.close();

    }

}

public char getSeprator() {

    return seprator;

}

public void setSeprator(char seprator) {

    this.seprator = seprator;

}


         }

Answer 1

当使用当前系统这个表达时，它可能意味着执行Java的系统或者执行DB2的系统。

您可以使用前面的答案获得Java日期。

对于DB2日期，您应该在insert语句中提供此信息

current date

例如，对于一张桌子

create table t1 (date date)

insert into t1 values (current date)

• 当前日期特殊注册 http://pic.dhe.ibm.com/infocenter/db2luw/v10r5/topic/com.ibm.db2.luw.sql.ref.doc/doc/r0005870.html

最后，如果您真的想将数据导入DB2，最好使用import或LOAD命令，而不是重新创建自己的工具。

• 加载http://pic.dhe.ibm.com/infocenter/db2luw/v10r5/topic/com.ibm.db2.luw.admin.cmd.doc/doc/r0008305.html
• 进口http://pic.dhe.ibm.com/infocenter/db2luw/v10r5/topic/com.ibm.db2.luw.admin.cmd.doc/doc/r0008304.html

Answer 2

SimpleDateFormat cDate = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
Date now = new Date();
String ccDate = cDate.format(now);

将获取当前时间并将字符串ccDate插入数据库。实例

Answer 3

private static final 
 String SQL_INSERT = "INSERT INTO OPPTYMGMT.${table}
     (${keys}, my_timestamp_column)      VALUES(${values}, current_timestamp)";