下面的类将把 .csv 导入到数据库表中。它工作正常，现在我需要更新同一个表中的另一列，其中需要获取当前系统时间戳 当该程序在数据库表的相应列中执行时得到更新。
示例:在 Db2 表中，主题列为: 英语社会数学时间戳
.CSV 文件中只有 3 列 Eng Social Maths 。
将 .csv 文件导入(使用上述程序)到 db2 时，除时间戳之外的所有列都会更新。 时间戳用于确定 .csv 文件上传到表的时间。 那么，如何同时用当前系统时间戳更新时间戳列呢？请帮忙
公共(public)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;
}
}
最佳答案
private static final
String SQL_INSERT = "INSERT INTO OPPTYMGMT.${table}
(${keys}, my_timestamp_column) VALUES(${values}, current_timestamp)";
关于java - 加载.csv文件时如何将当前系统时间戳插入db2数据库基列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18225333/