下面的类将.csv导入到数据库table.it工作正常，现在我需要更新当前系统时间戳需要获取的同一个表中的另一列 在数据库表的相应列中执行此程序时更新。
示例：在Db2表中主题列是： Eng社交数学TimeStamp
在.CSV文件中只有3列Eng Social Maths。
当将.csv文件导入（使用上述程序）到db2时，除TimeStamp外，所有列都会更新。 当.csv文件上传到表时，时间戳被包含在内。 那么，如何同时使用当前系统时间戳更新TimeStamp列。请帮忙
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;
}
}
答案 0 :(得分：2)
private static final
String SQL_INSERT = "INSERT INTO OPPTYMGMT.${table}
(${keys}, my_timestamp_column) VALUES(${values}, current_timestamp)";
答案 1 :(得分：0)
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插入到数据库中。 Example
答案 2 :(得分：0)
当使用表达式current system时，它可能意味着执行Java的系统或执行DB2的系统。
您可以使用上一个答案获取Java日期。
对于DB2日期，您应该在insert语句中提供它
current date
例如，对于表
create table t1 (date date)
insert into t1 values (current date)
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。