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| Java Programming with Oracle SQLJ | | | Copyright | | | Table of Contents | | | Preface | | | 1. Introduction | | | 2. Relational Databases, SQL, and PL/SQL | | | 3. Fundamental SQLJ Programming | | | 4. Database Objects | | | 5. Collections | | | 6. Deploying SQLJ in the JServer | | | 7. Large Objects | | | 8. Contexts and Multithreading | | | 9. Advanced Transaction Control | | | 10. Performance Tuning | | | 11. Combining JDBC, SQLJ, and Dynamic SQL | | | A. Java and Oracle Type Mappings | | | | A.1 JDBC 1.x Type Mappings | | | | A.2 Additional JDBC 2.0 Type Mappings | | | | A.3 Java Wrapper Class Mappings | | | | A.4 SQLJ Stream Class Mappings | | | | A.5 Oracle Extension Class Mappings | | | B. Oracle Java Utilities Reference | | | C. SQLJ in Applets, Servlets, and JavaServer Pages | | | Colophon | | | Index | | | Database > Java Programming with Oracle SQLJ > A. Java and Oracle Type Mappings > A.3 Java Wrapper Class Mappings | A.3 Java Wrapper Class Mappings Java wrapper classes allow you to store database NULL values, whereas the Java primitive types (such as int and float) do not. The Java wrapper classes are useful when you are retrieving a database column value that may be NULL. Table A-3 lists the mappings between the Java wrapper classes and the compatible Oracle types. Table A-3. Java wrapper class mappings Java type | Oracle type | java.lang.Boolean | NUMBER | java.lang.Byte | NUMBER | java.lang.Short | NUMBER | java.lang.Integer | NUMBER | java.lang.Long | NUMBER | java.lang.Float | NUMBER | java.lang.Double | NUMBER | |
Index terms contained in this section boolean datatype Boolean class Byte class datatypes Java and Oracle type mappings Java wrapper classes double datatype Double class float datatype (Java) Float class Integer class java.lang.Boolean wrapper class java.lang.Byte wrapper class java.lang.Double wrapper class java.lang.Float wrapper class java.lang.Integer wrapper class java.lang.Long wrapper class java.lang.Short wrapper class Long class short datatype Short class | |