我想將csv文件的內容傳輸到mysql。在我的csv文件中,有包含逗號的文本的列。解析csv文件中的文本中存在的逗號,同時將內容從csv文件傳輸到mysql
我使用下面的代碼來傳輸內容
`
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.util.Date;
import org.apache.commons.lang.StringUtils;
import au.com.bytecode.opencsv.CSVReader;
public class CSVLoader {
static int count;
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), this.seprator);
} catch (Exception e) {
e.printStackTrace();
throw new Exception("Error occured while executing file. "
+ e.getMessage());
}
//String[] headerRow = csvReader.readNext();
String[] headerRow = csvReader.readNext();
count++;
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);
System.out.println(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);
}
}
System.out.println(count);
ps.addBatch();
System.out.println(count);
}
if (++count % batchSize == 0) {
System.out.println(count);
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;
}
}
` 當執行它我收到錯誤爲「爲參數23指定值」。 我的數據庫表有22列,csv文件也有22列。所以我猜測,在第一行本身有一個文本中有一個逗號,它不能解析它,因此它假設爲23列,而不是22. 任何人都可以幫助我澄清問題並提供解決方案。
>所以我猜測,在第一行本身有一個文本,其中有一個逗號......那麼,有沒有或沒有?我會假設你可以檢查這個。我們當然不能,這是這個難題的重要信息。 – Medo42
你可能會發現有用[LOAD DATA INFILE語句](http://dev.mysql.com/doc/refman/5.1/en/load-data.html) – alko
是的,第一行本身有逗號。我的意思是通過在帖子中說是我猜測它正在考慮23列,因爲這個逗號 – user2916886