Table 17-22 lists limitations to the methods in the Connection class that are defined in the JDBC1.0 standard, while Table 17-23 lists limitations to the methods added in the JDBC2.0 basic standard.

Table 17-22 Limitations to the methods in the Connection class that are defined in the JDBC1.0 standard

Method defined in JDBC1.0 standard	Limitation
setReadOnly	Not usable.
isReadOnly	Unconditionally returns false.
setCatalog	Not usable.
getCatalog	Returns null unconditionally.
setTransactionIsolation	Not usable.
getTransactionIsolation	Returns TRANSACTION_REPEATABLE_READ unconditionally.

Table 17-23 Limitations to the methods in the Connection class that are added in the JDBC2.0 basic standard

Method added in JDBC2.0 basic standard	Limitation
createStatement	A result set reflecting updating results is not usable. Therefore, if TYPE_SCROLL_SENSITIVE is specified for the result set type, the method changes it to TYPE_SCROLL_INSENSITIVE and sets an SQLWarning.
prepareStatement
prepareCall
getTypeMap	Unconditionally throws SQLException because a user-defined type is not usable.
setTypeMap