# java.sql.SQLWarning class

Derby can generate a warning in certain circumstances. A warning is generated if, for example, you try to connect to a database with the create attribute set to true if the database already exists.

Aggregates like SUM also raise a warning if NULL values are encountered during the evaluation.

All other informational messages are written to the Derby system's derby.log file.

Parent topic: JDBC reference
Related reference
java.sql.Driver interface
java.sql.DriverManager.getConnection method
java.sql.Connection interface
java.sql.DatabaseMetaData interface
java.sql.Statement interface
java.sql.CallableStatement interface
java.sql.PreparedStatement interface
java.sql.ResultSet interface
java.sql.ResultSetMetaData interface
java.sql.SQLException class
java.sql.SQLXML interface
java.sql.Savepoint interface
Mapping of java.sql.Types to SQL types
Features supported on JDBC 4.1 and above
JDBC 4.2-only features
JDBC escape syntax