Error Handling Jdbc Oracle
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JDBC Establishing a Connection Connecting with DataSource Objects Handling SQLExceptions Setting Up Tables Retrieving and Modifying Values from Result Sets Using Prepared Statements Using Transactions Using RowSet Objects Using JdbcRowSet Objects Using CachedRowSetObjects Using error while registering oracle jdbc diagnosability mbean JoinRowSet Objects Using FilteredRowSet Objects Using WebRowSet Objects Using Advanced Data Types Using Large
Class Forname Oracle Jdbc Driver Oracledriver Error
Objects Using SQLXML Objects Using Array Objects Using DISTINCT Data Type Using Structured Objects Using Customized Type Mappings Using Datalink jdbc executebatch error handling Objects Using RowId Objects Using Stored Procedures Using JDBC with GUI API Trail: JDBC(TM) Database Access Lesson: JDBC Basics Home Page > JDBC(TM) Database Access > JDBC Basics «Previous•Trail•Next» Handling SQLExceptions This page
Oracle Error Handling Best Practice
covers the following topics: Overview of SQLException Retrieving Exceptions Retrieving Warnings Categorized SQLExceptions Other Subclasses of SQLException Overview of SQLException When JDBC encounters an error during an interaction with a data source, it throws an instance of SQLException as opposed to Exception. (A data source in this context represents the database to which a Connection object is connected.) The SQLException instance contains the following information that can help oracle error handling framework you determine the cause of the error: A description of the error. Retrieve the String object that contains this description by calling the method SQLException.getMessage. A SQLState code. These codes and their respective meanings have been standardized by ISO/ANSI and Open Group (X/Open), although some codes have been reserved for database vendors to define for themselves. This String object consists of five alphanumeric characters. Retrieve this code by calling the method SQLException.getSQLState. An error code. This is an integer value identifying the error that caused the SQLException instance to be thrown. Its value and meaning are implementation-specific and might be the actual error code returned by the underlying data source. Retrieve the error by calling the method SQLException.getErrorCode. A cause. A SQLException instance might have a causal relationship, which consists of one or more Throwable objects that caused the SQLException instance to be thrown. To navigate this chain of causes, recursively call the method SQLException.getCause until a null value is returned. A reference to any chained exceptions. If more than one error occurs, the exceptions are referenced through this chain. Retrieve these exceptions by calling the method SQLException.getNextException on the exception that was thrown. Retrieving Exceptions The following method, JDBCTutori
- Sample Code JDBC - Driver Types JDBC - Connections JDBC - Statements JDBC - Result Sets JDBC - Data Types JDBC - Transactions JDBC - Exceptions JDBC - Batch
Oracle Error Handling In Stored Procedure
Processing JDBC - Stored Procedure JDBC - Streaming Data JDBC Examples JDBC -
J2ee Error Handling
Create Database JDBC - Select Database JDBC - Drop Database JDBC - Create Tables JDBC - Drop Tables JDBC - sql error handling Insert Records JDBC - Select Records JDBC - Update Records JDBC - Delete Records JDBC - WHERE Clause JDBC - Like Clause JDBC - Sorting Data JDBC Useful Resources JDBC - Questions and https://docs.oracle.com/javase/tutorial/jdbc/basics/sqlexception.html Answers JDBC - Quick Guide JDBC - Useful Resources JDBC - Discussion Useful - Java Tutorials Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JDBC - Exceptions Handling Advertisements Previous Page Next Page Exception handling allows you to handle exceptional conditions such as program-defined errors in a controlled fashion. When an exception condition occurs, http://www.tutorialspoint.com/jdbc/jdbc-exceptions.htm an exception is thrown. The term thrown means that current program execution stops, and the control is redirected to the nearest applicable catch clause. If no applicable catch clause exists, then the program's execution ends. JDBC Exception handling is very similar to the Java Exception handling but for JDBC, the most common exception you'll deal with is java.sql.SQLException. SQLException Methods An SQLException can occur both in the driver and the database. When such an exception occurs, an object of type SQLException will be passed to the catch clause. The passed SQLException object has the following methods available for retrieving additional information about the exception − Method Description getErrorCode( ) Gets the error number associated with the exception. getMessage( ) Gets the JDBC driver's error message for an error, handled by the driver or gets the Oracle error number and message for a database error. getSQLState( ) Gets the XOPEN SQLstate string. For a JDBC driver error, no useful information is returned from this method. For a database error, the five-digit XOPEN SQLstate code is returned. This method can return null. getNextException( ) Gets the next Exception object in the exception chain. printStackTrace( ) Prints the curr
segment of code might throw, we have to have a good understanding of what it does. So http://onewebsql.com/blog/how-to-handle-exceptions-in-jdbc let's quickly review what happens in a standard JDBC operation. The http://stackoverflow.com/questions/35590708/jdbc-catching-login-failure-exception-and-re-promts-for-input basic scheme of any JDBC operation is pretty straightforward: Get a connection. Create a statement. Execute the statement and get a ResultSet. Process the ResultSet. Close everything: the ResultSet, the Statement, and the Connection. The code will look something like this: public void handleJDBC() error handling { DataSource dataSource = getDataSource(); Connection connection = dataSource.getConnection(); String query = "SELECT * FROM book"; PreparedStatement preparedStatement = connection.prepareStatement(query); ResultSet resultSet = preparedStatement.executeQuery(); //process resultSet resultSet.close(); preparedStatement.close(); connection.close(); } This code doesn't compile, and I bet you know why - we haven't included any exception handling, and pretty much every line here can throw oracle error handling an exception. In Java you have to either declare or handle exceptions. But handling of exceptions in JDBC is surprisingly difficult. Today we'll show you how to handle exceptions related to the Connection object. The other exceptions can be handled in a similar way. We will abbreviate this code String query = "SELECT * FROM book"; PreparedStatement preparedStatement = connection.prepareStatement(query); ResultSet resultSet = preparedStatement.executeQuery(); //process resultSet resultSet.close(); preparedStatement.close(); as operation(connection) An inexperienced programmer might try something like this: Bad Solution 1: Just add the "throws" declaration public void handleJDBC() throws SQLException { operation(connection) } Or this: Bad Solution 1A: Catch everything public void handleJDBC() { try { DataSource dataSource = getDataSource(); Connection connection = dataSource.getConnection(); operation(connection) connection.close(); } catch (SQLException e) { //do something here } } The inability of many novice programmers to write something sensible in the catch block (the do something here) is a topic for another time. So this code compiles, but it doesn't work. We could have
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up JDBC catching login failure exception and re-promts for input up vote 0 down vote favorite try{ Class.forName ("oracle.jdbc.driver.OracleDriver"); // identify Connection con = DriverManager.getConnection ("jdbc:oracle...",userid,password); // create Statement and execute sql statement after } catch (SQLException ex) { Logger.getLogger(Transcript.class.getName()).log(Level.SEVERE, null, ex); } The only exception I can find is SQLException, but how can it distinguish from login failure and incorrect sql statement? I want it to re-promts the user for another chance of entering id and password, do I put that in the catch block? if so, do i need another nested try-catch to handle the exception? As I want to handle the two situations separately, but it seems like there is only a SQLException I can use. java sql jdbc share|improve this question edited Feb 24 at 0:30 asked Feb 23 at 23:57 RhumB 636 stackoverflow.com/questions/3466568/… –Reimeus Feb 24 at 0:09 Extract those two operations (acquiring the connection and executing SQL statements) into their own methods, each of which can have separate try-catch blocks for exception handling. –Mick Mnemonic Feb 24 at 0:33 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted Actually, you'll get a few more: If you don't have the right Oracle driver in the classpath in