I've this preparesStatement:
String insertSQL = "(INSERT INTO visit(Doc_Number, Pat_Number,
to_timestamp(Date DD/MM/YYYY), Price) VALUES (?,?,?,?))"
PreparedStatement pstvisit = conn.prepareStatement(insertSQL);
And I'm tryind to do this:
for (List<String> row : fileContents){
pstvisit.clearParameters();
pstvisit.executeUpdate("INSERT INTO VISIT
(Doc_Number, Pat_Number, to_timestamp(Date DD/MM/YYYY),
Price) VALUES (?, ?, ?, ?)");
FileContents read a file data with this format:
# Doc_Nmber, Pat_Number, Visit_Date, Price
26902,6574405,30/03/2011,315
26507,6392432,14/03/2010,322
35356,6574405,15/02/2011,475
35252,9062865,07/07/2011,140
If I do:
System.out.println(row);
I get the same exit as file data.
My question is, how I can transfer the data of datafile into
preparedStatement like
pstvisit.setInt(1, GetTheDoc_NumberOfTheCorrectRow)
pstvisit.setInt(2, GetThePat_NumberOfTheCorrectRow)
EDIT
how is created fileContents,
I use this instruction in main class:
public Exercise1UpdateOrInsertDataFromFile() {
super();
fileUtilities = new FileUtilities();
}
public static void main(String[] args) {
Exercise1UpdateOrInsertDataFromFile app = new Exercise1UpdateOrInsertDataFromFile();
app.run();
}
private void run() {
List<List<String>> fileContents = null;
try {
fileContents = fileUtilities.readFileFromClasspath("exercise1.data");
} catch (FileNotFoundException e) {
System.err.println("ERROR: File not found");
e.printStackTrace();
} catch (IOException e) {
System.err.println("ERROR: I/O error");
e.printStackTrace();
}
if (fileContents == null) {
return;
}
And fileUtilites implementation is:
public class FileUtilities {
/**
* Reads a comma separated file from the classpath.
*/
public List<List<String>> readFileFromClasspath(String file)
throws FileNotFoundException, IOException {
InputStream is = getClass().getClassLoader().getResourceAsStream(file);
InputStreamReader inputStreamReader = new InputStreamReader(is);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
return readFileFromBufferedReader(bufferedReader);
}
/**
* Reads a comma separated file from the filesystem.
*/
public List<List<String>> readFileFromFilesystem(String file)
throws FileNotFoundException, IOException {
BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
return readFileFromBufferedReader(bufferedReader);
}
/**
* Reads a comma separacted file from a Reader.
* <ul>
* <li>Lines started with '#' are ignored.</li>
* <li>Spaces before and after the comma are ignored.</li>
* <li>Fields can be surrounded by quotes.
*/
private List<List<String>> readFileFromBufferedReader(
BufferedReader bufferedReader) throws FileNotFoundException,
IOException {
List<List<String>> fileRows = new ArrayList<List<String>>();
String line = bufferedReader.readLine();
while (line != null && line.length() > 0) {
if (line.charAt(0) != '#') {
List<String> rowValues = new ArrayList<String>();
String[] tokens = line
.split(",(?=([^\"]*\"[^\"]*\")*(?![^\"]*\"))");
for (String token : tokens) {
String processedToken = stripQutoes(token);
rowValues.add(processedToken);
}
fileRows.add(rowValues);
}
line = bufferedReader.readLine();
}
bufferedReader.close();
return fileRows;
}
private String stripQutoes(String token) {
String tokenWithoutSpaces = token.trim();
if (tokenWithoutSpaces.length() > 0) {
if (tokenWithoutSpaces.charAt(0) == '"'
&& tokenWithoutSpaces
.charAt(tokenWithoutSpaces.length() - 1) == '"') {
return tokenWithoutSpaces.substring(1,
tokenWithoutSpaces.length() - 1);
}
}
return tokenWithoutSpaces;
}
}
You can use String#split()
to split row
into the four chucks. Then convert each String into its desired format.
for (String row : fileContents) {
pstvisit.clearParameters();
String[] rowData = row.split(",");
int docNumber = Integer.valueOf(rowData[0]);
int patNumber = Integer.valueOf(rowData[1]);
String date = row[2];
int price = Integer.valueOf(row[3]);
pstvisit.setInt(1, docNumber);
pstvisit.setInt(2, patNumber);
pstvisit.setString(3, date);
pstvisit.setInt(4, price);
pstvisit.executeUpdate();
}
You should also consider putting the entire 'update' loop above into a transaction to improve performance.
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