# java.sql.SQLWarning

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 concepts
Core JDBC java.sql Classes, Interfaces, and Methods
Related reference
java.sql.Driver
java.sql.DriverManager.getConnection
java.sql.Driver.getPropertyInfo
java.sql.Connection
java.sql.DatabaseMetaData
java.sql.Statement
java.sql.CallableStatement
java.sql.SQLException
java.sql.PreparedStatement
java.sql.ResultSet
java.sql.ResultSetMetaData
java.sql.SQLXML
Mapping of java.sql.Types to SQL types
java.sql.Blob and java.sql.Clob
java.sql.Connection
java.sql.ResultSet
java.sql.Statement
java.sql.PreparedStatement
java.sql.CallableStatement
java.sql.DatabaseMetaData
java.sql.ResultSetMetaData
java.sql.BatchUpdateException
JDBC Package for Connected Device Configuration/Foundation Profile (JSR169)
JDBC 3.0-only features
JDBC 4.0-only features
JDBC escape syntax