Ronak Pandya Ronak Pandya - 6 months ago 30
Java Question

Java Execute multiple SQL statements and write in excel

I want to execute multiple SQL statements and write their output in excel file.
I have written some code for this but while executing this throws an error


java.sql.BatchUpdateException: Can not issue SELECT via
executeUpdate() or executeLargeUpdate(). at
com.mysql.jdbc.SQLError.createBatchUpdateException(SQLError.java:1158)
at
com.mysql.jdbc.StatementImpl.executeBatchInternal(StatementImpl.java:1049)
at com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:959)
at Demo.DatabaseQry(Demo.java:133) at Demo.main(Demo.java:48) Caused
by: java.sql.SQLException: Can not issue SELECT via executeUpdate() or
executeLargeUpdate(). at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957) at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885) at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) at
com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1504)
at
com.mysql.jdbc.StatementImpl.executeBatchInternal(StatementImpl.java:1023)
... 3 more


My Code is...

public static void DatabaseQry(String ipAdd, String dbNm, String dbUnm, String dbPasswd)
{
String ipAddress, dbName, dbUserId, dbPassword, fileLocation;

Connection conn = null;
Statement stmt = null;
try {
ipAddress = ipAdd;
dbName = dbNm;
dbUserId = dbUnm;
dbPassword = dbPasswd;

BufferedReader brd = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter Output File location: ");
fileLocation = brd.readLine();

// Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");

// Open a connection
System.out.println("Connecting to database...");

conn = DriverManager.getConnection("jdbc:mysql://" + ipAddress + ":3306/" + dbName, dbUserId, dbPassword);

// Execute a query
System.out.println("Working on Query...");
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);

//String TotalWorkflow = "SELECT COUNT(*) AS TOTAL_WORKFLOW FROM M_OBJECT WHERE TYPE_ IN(7)";
String TotalAssets = "SELECT COUNT(*) AS TOTAL_ASSET FROM M_OBJECT WHERE TYPE_ IN(1,2,3)";
String TotalJobs = "SELECT COUNT(*) AS TOTAL_JOBS FROM M_OBJECT WHERE TYPE_ IN(6)";
String TotalTasks = "SELECT COUNT(*) AS TOTAL_TASKS FROM M_OBJECT WHERE TYPE_ IN(5)";
conn.setAutoCommit(false);
//stmt.addBatch(TotalWorkflow);
stmt.addBatch(TotalAssets);
stmt.addBatch(TotalJobs);
stmt.addBatch(TotalTasks);

//Workflow total count
ResultSet rs = stmt.executeQuery("SELECT COUNT(*) AS TOTAL_WORKFLOW FROM M_OBJECT WHERE TYPE_ IN(7)");
rs.last();
stmt.executeBatch();

conn.commit();
rs.last();
System.out.println("Batch executed");

// Excel file generation code
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Readings");

HSSFFont font = workbook.createFont();
font.setFontHeightInPoints((short)12);
font.setFontName("Arial");
// font.setColor(IndexedColors.DARK_BLUE.getIndex());
font.setBold(true);

HSSFCellStyle style = workbook.createCellStyle();
style.setBorderTop((short) 6); // double lines border
style.setBorderBottom((short) 2); // single line border
style.setFont(font);
style.setFillPattern(CellStyle.BORDER_DASH_DOT);

sheet.createFreezePane(0, 1); // Freeze 1st Row sheet.createFreezePane(int colSplit, int rowSplit, int leftmostColumn, int topRow)

// Extract data from result set
for (int i = 1; rs.next(); i++) {
HSSFRow row = sheet.createRow(1);
HSSFRow rowhead = sheet.createRow((short) 0);
rowhead.setRowStyle(style);

// For Workflow
rowhead.createCell(8).setCellValue("WORKFLOWS");
row.createCell(8).setCellValue(rs.getString("TOTAL_WORKFLOW"));

// For Assets
rowhead.createCell(9).setCellValue("ASSETS");
row.createCell(9).setCellValue(rs.getString("TOTAL_ASSET"));

// For Jobs
rowhead.createCell(10).setCellValue("JOBS");
row.createCell(10).setCellValue(rs.getString("TOTAL_JOBS"));

// For Tasks
rowhead.createCell(11).setCellValue("TASKS");
row.createCell(11).setCellValue(rs.getString("TOTAL_TASKS"));

//row.createCell(1).setCellValue(rs.getString("EXCEPTION_COUNT_"));
}

// FileOutputStream fileOut = new FileOutputStream(filename);
FileOutputStream fileOut = new FileOutputStream(fileLocation + "\\Readings.xls");
workbook.write(fileOut);
fileOut.close();
System.out.println("Excel file has been generated");

// Clean-up environment
rs.close();
stmt.close();
conn.close();
} catch (SQLException se) {
// Handle errors for JDBC
System.out.println("Unable to make connection with database...!");
se.printStackTrace();
} catch (Exception e) {
// Handle errors for Class.forName
e.printStackTrace();
} finally {
// finally block used to close resources
System.out.println("\n\nPress \"Enter\" to exit...\n");
try {
System.in.read();
} catch (Exception e) {
e.printStackTrace();
}
try {
if (stmt != null)
stmt.close();
} catch (SQLException se2) {
} // nothing we can do
try {
if (conn != null)
conn.close();
} catch (SQLException se) {
se.printStackTrace();
} // end finally try
} // end try
System.out.println("Execution Completed");
}

Answer

You cannot use addBatch for select queries. statement.addBatch() is only for update/insert/delete queries or queries which does not provide any results.

    String TotalAssets = "SELECT COUNT(*) AS TOTAL_ASSET FROM M_OBJECT WHERE TYPE_ IN(1,2,3)";
    stmt1 = con.createStatement();
    ResultSet rsTotalAssets = stmt1.executeQuery(TotalAssets);
    rsTotalAssets.next();
    int totalAssetsCount = rsTotalAssets.getInt("TOTAL_ASSET");

Use the totalAssetsCount in setting the appropriate cell value. Repeat the above code for TotalJobs and TotalTasks.

close the statement and resultset in the finally block

    rsTotalAssets.close();
    stmt1.close();
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