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  Tutorial: An Introduction to JDBC

Any JDBC object that encounters an error serious enough to halt execution throws a SQLException.

Tutorial Details:

For example, database connection errors, malformed SQL statements, and insufficient database privileges all throw SQLException objects.

The SQLException class extends the normal java.lang.Exception class and defines an additional method called getNextException( ). This allows JDBC classes to chain a series of SQLException objects together. SQLException also defines the getSQLState( ) and getErrorCode( ) methods to provide additional information about an error. The value returned by getSQLState( ) is one of the ANSI-92 SQL state codes.getErrorCode( ) returns a vendor-specific error code.

An extremely conscientious application might have a catch block that looks something like this:

try {
// Actual database code
}
catch (SQLException e) {
while(e != null) {
System.out.println("\nSQL Exception:");
System.out.println(e.getMessage( ));
System.out.println("ANSI-92 SQL State: " + e.getSQLState( ));
System.out.println("Vendor Error Code: " + e.getErrorCode( ));
e = e.getNextException( );
}
}


 

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