我在解析 Java 中的 csv 文件并使用它插入数据库时遇到问题。
我正在使用以下代码：
public class CSVLoader {
private static final
String SQL_INSERT = "INSERT INTO ${table}(${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 constructor to build CSVLoader object with
* Connection details. The connection is closed on success
* or failure.
* @param connection
*/
public CSVLoader(Connection connection) {
this.connection = connection;
//Set default separator
this.seprator = '|';
}
/**
* Parse CSV file using OpenCSV library and load in
* given database table.
* @param csvFile Input CSV file
* @param tableName Database table name to import data
* @param truncateBeforeLoad Truncate the table before inserting
* new records.
* @throws Exception
*/
public void loadCSV(String csvFile, String tableName,
boolean truncateBeforeLoad) throws Exception {
CSVReader csvReader = null;
if(null == this.connection) {
throw new Exception("Not a valid connection.");
}
try {
csvReader = new CSVReader(new FileReader(csvFile), '|', '\'', 4);
} 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.");
}
System.out.println(headerRow.length);
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);
if(truncateBeforeLoad) {
//delete data from table before loading csv
con.createStatement().execute("DELETE FROM " + tableName);
}
final int batchSize = 1000;
int count = 0;
Date date = null;
while ((nextLine = csvReader.readNext()) != null) {
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);
}
}
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();
csvReader.close();
}
}
public char getSeprator() {
return seprator;
}
public void setSeprator(char seprator) {
this.seprator = seprator;
}
public static void main(String[] args) throws ClassNotFoundException, SQLException, Exception {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:jtds:sqlserver://172.16.0.221:1433/tripicker; useNTLMv2; domain=TEST", "root", "");
CSVLoader loader = new CSVLoader(conn);
loader.loadCSV("C:\\lol.csv", "lol", true);
}
}
但是当我测试它时，它给了我以下异常：
java.sql.BatchUpdateException：参数 #2 尚未设置。
csv是这样的：
Generation Date |2013-05-22 17:57:08|||||||
Number of rows |122837|||||||
Idrissi|Youssef
cks|grrrr
我桌子的栏目是 Idrissi 和 youssef。
谢谢你的帮助