java.lang.Object
org.apache.derby.impl.sql.GenericStatement
- All Implemented Interfaces:
- org.apache.derby.iapi.sql.Statement
- public class GenericStatement
- extends java.lang.Object
- implements org.apache.derby.iapi.sql.Statement
compilationSchema
private final org.apache.derby.iapi.sql.dictionary.SchemaDescriptor compilationSchema
statementText
private final java.lang.String statementText
prepareIsolationLevel
private int prepareIsolationLevel
preparedStmt
private GenericPreparedStatement preparedStmt
GenericStatement
public GenericStatement(org.apache.derby.iapi.sql.dictionary.SchemaDescriptor compilationSchema,
java.lang.String statementText)
- Constructor for a Statement given the text of the statement in a String
prepare
public org.apache.derby.iapi.sql.PreparedStatement prepare(org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
throws org.apache.derby.iapi.error.StandardException
- Description copied from interface:
org.apache.derby.iapi.sql.Statement
- Generates an execution plan without executing it.
- Specified by:
prepare in interface org.apache.derby.iapi.sql.Statement
prepMinion
private org.apache.derby.iapi.sql.PreparedStatement prepMinion(org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc,
boolean cacheMe,
java.lang.Object[] paramDefaults,
org.apache.derby.iapi.sql.dictionary.SchemaDescriptor spsSchema,
boolean internalSQL)
throws org.apache.derby.iapi.error.StandardException
prepareStorable
public org.apache.derby.iapi.sql.PreparedStatement prepareStorable(org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc,
org.apache.derby.iapi.sql.PreparedStatement ps,
java.lang.Object[] paramDefaults,
org.apache.derby.iapi.sql.dictionary.SchemaDescriptor spsSchema,
boolean internalSQL)
throws org.apache.derby.iapi.error.StandardException
- Generates an execution plan given a set of named parameters.
Does so for a storable prepared statement.
- Specified by:
prepareStorable in interface org.apache.derby.iapi.sql.Statement
getSource
public java.lang.String getSource()
- Description copied from interface:
org.apache.derby.iapi.sql.Statement
- Return the SQL string that this statement is for.
- Specified by:
getSource in interface org.apache.derby.iapi.sql.Statement
getUnicode
public boolean getUnicode()
- Specified by:
getUnicode in interface org.apache.derby.iapi.sql.Statement
getCompilationSchema
public java.lang.String getCompilationSchema()
getCurrentTimeMillis
private static long getCurrentTimeMillis(org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
getElapsedTimeMillis
private static long getElapsedTimeMillis(long beginTime)
equals
public boolean equals(java.lang.Object other)
- Description copied from class:
java.lang.Object
- Determine whether this Object is semantically equal
to another Object.
There are some fairly strict requirements on this
method which subclasses must follow:
- It must be transitive. If
a.equals(b) and
b.equals(c), then a.equals(c)
must be true as well.
- It must be symmetric.
a.equals(b) and
b.equals(a) must have the same value.
- It must be reflexive.
a.equals(a) must
always be true.
- It must be consistent. Whichever value a.equals(b)
returns on the first invocation must be the value
returned on all later invocations.
a.equals(null) must be false.- It must be consistent with hashCode(). That is,
a.equals(b) must imply
a.hashCode() == b.hashCode().
The reverse is not true; two objects that are not
equal may have the same hashcode, but that has
the potential to harm hashing performance.
This is typically overridden to throw a java.lang.ClassCastException
if the argument is not comparable to the class performing
the comparison, but that is not a requirement. It is legal
for a.equals(b) to be true even though
a.getClass() != b.getClass(). Also, it
is typical to never cause a java.lang.NullPointerException.
In general, the Collections API (java.util) use the
equals method rather than the ==
operator to compare objects. However, java.util.IdentityHashMap
is an exception to this rule, for its own good reasons.
The default implementation returns this == o.
hashCode
public int hashCode()
- Description copied from class:
java.lang.Object
- Get a value that represents this Object, as uniquely as
possible within the confines of an int.
There are some requirements on this method which
subclasses must follow:
- Semantic equality implies identical hashcodes. In other
words, if
a.equals(b) is true, then
a.hashCode() == b.hashCode() must be as well.
However, the reverse is not necessarily true, and two
objects may have the same hashcode without being equal.
- It must be consistent. Whichever value o.hashCode()
returns on the first invocation must be the value
returned on all later invocations as long as the object
exists. Notice, however, that the result of hashCode may
change between separate executions of a Virtual Machine,
because it is not invoked on the same object.
Notice that since hashCode is used in
java.util.Hashtable and other hashing classes,
a poor implementation will degrade the performance of hashing
(so don't blindly implement it as returning a constant!). Also,
if calculating the hash is time-consuming, a class may consider
caching the results.
The default implementation returns
System.identityHashCode(this)
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