public final class JDBCStatementCache extends java.lang.Object
The entries in the cache contains objects implementing the
java.sql.PreparedStatement interface, and they are inserted with
a key object implementing the interface
StatementKey. The cached
objects can be either
java.sql.CallableStatement. These two should be separated by
using different types of keys.
The cache only contains free statement objects, and on a successful request
for a cached statement the statement is removed from the cache. The cache is
not intended to hold duplicate statements. The physical prepared statement
should be (re-)inserted into the cache when
close is called on
the logical prepared statement using it.
There is a maximum number of cached statements associated with the cache. If this number is exceeded, the oldest entry will be thrown out. One can always throw out an entry, because the fact that it is in the cache means it is free and not in use.
|Constructor and Description|
Creates a new, empty JDBC statement cache.
|Modifier and Type||Method and Description|
Cache the prepared statement if it does not already exist.
Retrieves a cached prepared statement if one exists.
public JDBCStatementCache(int maxSize)
maxSize- maximum number of statements in the cache
maxSizeis less than one
public java.sql.PreparedStatement getCached(StatementKey statementKey)
statementKey- key for the prepared statement to look up
public boolean cacheStatement(StatementKey statementKey, java.sql.PreparedStatement ps)
statementKey- key to insert prepared statement with
ps- prepared statement to cache
trueif added to the cache,