[英]Java Execute multiple SQL statements and write in excel
I want to execute multiple SQL statements and write their output in excel file. 我想执行多个SQL语句并将其输出写入excel文件。 I have written some code for this but while executing this throws an error 我为此编写了一些代码,但是在执行此操作时会引发错误
java.sql.BatchUpdateException: Can not issue SELECT via executeUpdate() or executeLargeUpdate(). java.sql.BatchUpdateException:无法通过executeUpdate()或executeLargeUpdate()发出SELECT。 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(). 在com.mysql.jdbc.StatementImpl.executeBatchInternal(StatementImpl.java:1049)在com.mysql.jdbc.StatementImpl.java:10158在com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:959) )出现在Demo.main(Demo.java:48)出现在Demo.DatabaseQry(Demo.java:133)导致原因:java.sql.SQLException:无法通过executeUpdate()或executeLargeUpdate()发出SELECT。 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 在com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)在com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)在com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) )的com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)的com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1504)的com.mysql.jdbc.StatementImpl.executeBatchInternal(StatementImpl.java: 1023)...还有3个
My Code is... 我的密码是...
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");
}
You cannot use addBatch for select queries. 您不能将addBatch用于选择查询。 statement.addBatch() is only for update/insert/delete queries or queries which does not provide any results. statement.addBatch()仅用于更新/插入/删除查询或不提供任何结果的查询。
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. 在设置适当的单元格值时使用totalAssetsCount。 Repeat the above code for TotalJobs and TotalTasks. 对TotalJobs和TotalTasks重复以上代码。
close the statement and resultset in the finally block 在finally块中关闭语句和结果集
rsTotalAssets.close();
stmt1.close();
You should do something like this this for all your querystrings: 您应该对所有查询字符串执行以下操作:
private static String getResult(String query, String resultParamName) {
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
rs.last();
return rs.getString(resultParamName);
}
Exceptionhandling is left to do for yourself. 异常处理留给您自己做。 ;-) ;-)
Final Code: 最终代码:
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_WKFLW FROM TableName WHERE TYP_ IN(7)";
stmt = conn.createStatement();
String TotalAssets = "SELECT COUNT(*) AS TOTAL_ASSET FROM TableName WHERE TYP_ IN(1,2,3)";
String TotalJobs = "SELECT COUNT(*) AS TOTAL_J FROM TableName WHERE TYP_ IN(6)";
String TotalTasks = "SELECT COUNT(*) AS TOTAL_T FROM TableName WHERE TYP_ IN(5)";
ResultSet rs = stmt.executeQuery(TotalWorkflow);
rs.next();
int totalWorkflowCount = rs.getInt("TOTAL_WKFLW");
rs = stmt.executeQuery(TotalAssets);
rs.next();
int totalAssets = rs.getInt("TOTAL_ASSET");
rs = stmt.executeQuery(TotalJobs);
rs.next();
int totalJobs = rs.getInt("TOTAL_J");
rs = stmt.executeQuery(TotalTasks);
rs.next();
int totalTasks = rs.getInt("TOTAL_T");
// 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.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.FINE_DOTS);
sheet.createFreezePane(0, 1); // Freeze 1st Row sheet.createFreezePane(int colSplit, int rowSplit, int leftmostColumn, int topRow)
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(totalWorkflowCount);
// For Assets
rowhead.createCell(9).setCellValue("ASSETS");
row.createCell(9).setCellValue(totalAssets);
// For Jobs
rowhead.createCell(10).setCellValue("JOBS");
row.createCell(10).setCellValue(totalJobs);
// For Tasks
rowhead.createCell(11).setCellValue("TASKS");
row.createCell(11).setCellValue(totalTasks);
// 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");
}
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