Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.GenericStatement

Modifier and Type	Field and Description
private final SchemaDescriptor	compilationSchema
private final boolean	isForReadOnly
private GenericPreparedStatement	preparedStmt
private int	prepareIsolationLevel
private final String	statementText

Access	Constructor and Description
public	GenericStatement(SchemaDescriptor schema compilationSchema, String The text of the statement statementText, boolean if the statement is opened with level CONCUR_READ_ONLY isForReadOnly) Constructor for a Statement given the text of the statement in a String

Method Summary

Modifier and Type	Method and Description
public boolean	equals(Object the reference object with which to compare. other) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public String	getCompilationSchema()
private static long	getCurrentTimeMillis(LanguageConnectionContext lcc)
public PreparedStatement	Returns: the prepared statement that is associated with this statement getPreparedStatement() Return the `PreparedStatement` currently associated with this statement.
public String	getSource() Implements org.apache.derby.iapi.sql.Statement.getSource. Return the SQL string that this statement is for.
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for this object.
public PreparedStatement	prepare(LanguageConnectionContext The language connection context lcc) Implements org.apache.derby.iapi.sql.Statement.prepare. Generates an execution plan without executing it.
public PreparedStatement	prepare(LanguageConnectionContext the language connection context lcc, boolean If this statement is for a metadata call then we will allow internal sql syntax on such statement. This internal sql syntax is not available to a user sql statement. forMetaData) Implements org.apache.derby.iapi.sql.Statement.prepare. Generates an execution plan without executing it.
public PreparedStatement	Returns: A PreparedStatement that allows execution of the execution plan. prepareStorable(LanguageConnectionContext Compiler state variable. lcc, PreparedStatement Prepared statement ps, Object[] Parameter defaults paramDefaults, SchemaDescriptor schema of the stored prepared statement spsSchema, boolean True if this is for Derby-internal SQL internalSQL) Implements org.apache.derby.iapi.sql.Statement.prepareStorable. Generates an execution plan given a set of named parameters.
private PreparedStatement	prepMinion(LanguageConnectionContext lcc, boolean cacheMe, Object[] paramDefaults, SchemaDescriptor spsSchema, boolean internalSQL)
private void	walkAST(LanguageConnectionContext lcc, Visitable queryTree, int phase) Walk the AST, using a (user-supplied) Visitor

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll toString wait wait wait

compilationSchema	back to summary
private final SchemaDescriptor compilationSchema

isForReadOnly	back to summary
private final boolean isForReadOnly

preparedStmt	back to summary
private GenericPreparedStatement preparedStmt

prepareIsolationLevel	back to summary
private int prepareIsolationLevel

statementText	back to summary
private final String statementText

GenericStatement	back to summary
public GenericStatement(SchemaDescriptor compilationSchema, String statementText, boolean isForReadOnly) Constructor for a Statement given the text of the statement in a String Parameters compilationSchema:SchemaDescriptor schema statementText:String The text of the statement isForReadOnly:boolean if the statement is opened with level CONCUR_READ_ONLY

Method Detail

equals back to summary

equals	back to summary
public boolean equals(Object other) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters other:Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. Annotations @Override

public boolean equals(Object other)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

other:Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

getCompilationSchema	back to summary
public String getCompilationSchema()

getCurrentTimeMillis	back to summary
private static long getCurrentTimeMillis(LanguageConnectionContext lcc)

getPreparedStatement back to summary

getPreparedStatement	back to summary
public PreparedStatement getPreparedStatement() Return the `PreparedStatement` currently associated with this statement. Returns:PreparedStatement the prepared statement that is associated with this statement

public PreparedStatement getPreparedStatement()

Return the PreparedStatement currently associated with this statement.

Returns:PreparedStatement: the prepared statement that is associated with this statement

getSource	back to summary
public String getSource() Implements org.apache.derby.iapi.sql.Statement.getSource. Doc from org.apache.derby.iapi.sql.Statement.getSource. Return the SQL string that this statement is for. Returns:String the SQL string this statement is for.

getSource

back to summary

public String getSource()

Implements org.apache.derby.iapi.sql.Statement.getSource.

Doc from org.apache.derby.iapi.sql.Statement.getSource.

Return the SQL string that this statement is for.

Returns:String: the SQL string this statement is for.

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Doc from java.lang.Object.hashCode. Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by `java.util.HashMap`. The general contract of `hashCode` is: Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. Returns:int a hash code value for this object Annotations @Override

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object

Annotations

@Override

prepare	back to summary
public PreparedStatement prepare(LanguageConnectionContext lcc) throws StandardException Implements org.apache.derby.iapi.sql.Statement.prepare. Doc from org.apache.derby.iapi.sql.Statement.prepare. Generates an execution plan without executing it. Parameters lcc:LanguageConnectionContext The language connection context Returns:PreparedStatement A PreparedStatement that allows execution of the execution plan. Exceptions StandardException: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepare

back to summary

public PreparedStatement prepare(LanguageConnectionContext lcc) throws StandardException

Implements org.apache.derby.iapi.sql.Statement.prepare.

Doc from org.apache.derby.iapi.sql.Statement.prepare.

Generates an execution plan without executing it.

Parameters

lcc:LanguageConnectionContext: The language connection context

Returns:PreparedStatement

A PreparedStatement that allows execution of the execution plan.

Exceptions

StandardException:: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepare	back to summary
public PreparedStatement prepare(LanguageConnectionContext lcc, boolean forMetaData) throws StandardException Implements org.apache.derby.iapi.sql.Statement.prepare. Doc from org.apache.derby.iapi.sql.Statement.prepare. Generates an execution plan without executing it. Parameters lcc:LanguageConnectionContext the language connection context forMetaData:boolean If this statement is for a metadata call then we will allow internal sql syntax on such statement. This internal sql syntax is not available to a user sql statement. Returns:PreparedStatement A PreparedStatement that allows execution of the execution plan. Exceptions StandardException: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepare

back to summary

public PreparedStatement prepare(LanguageConnectionContext lcc, boolean forMetaData) throws StandardException

Implements org.apache.derby.iapi.sql.Statement.prepare.

Doc from org.apache.derby.iapi.sql.Statement.prepare.

Generates an execution plan without executing it.

Parameters

lcc:LanguageConnectionContext: the language connection context
forMetaData:boolean: If this statement is for a metadata call then we will allow internal sql syntax on such statement. This internal sql syntax is not available to a user sql statement.

Returns:PreparedStatement

A PreparedStatement that allows execution of the execution plan.

Exceptions

StandardException:: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepareStorable	back to summary
public PreparedStatement prepareStorable(LanguageConnectionContext lcc, PreparedStatement ps, Object[] paramDefaults, SchemaDescriptor spsSchema, boolean internalSQL) throws StandardException Implements org.apache.derby.iapi.sql.Statement.prepareStorable. Generates an execution plan given a set of named parameters. Does so for a storable prepared statement. Parameters lcc:LanguageConnectionContext Doc from org.apache.derby.iapi.sql.Statement.prepareStorable. Compiler state variable. ps:PreparedStatement Doc from org.apache.derby.iapi.sql.Statement.prepareStorable. Prepared statement paramDefaults:Object[] Parameter defaults spsSchema:SchemaDescriptor Doc from org.apache.derby.iapi.sql.Statement.prepareStorable. schema of the stored prepared statement internalSQL:boolean Doc from org.apache.derby.iapi.sql.Statement.prepareStorable. True if this is for Derby-internal SQL Returns:PreparedStatement A PreparedStatement that allows execution of the execution plan. Exceptions StandardException: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepareStorable

back to summary

public PreparedStatement prepareStorable(LanguageConnectionContext lcc, PreparedStatement ps, Object[] paramDefaults, SchemaDescriptor spsSchema, boolean internalSQL) throws StandardException

Implements org.apache.derby.iapi.sql.Statement.prepareStorable.

Generates an execution plan given a set of named parameters. Does so for a storable prepared statement.

Parameters

lcc:LanguageConnectionContext

Doc from org.apache.derby.iapi.sql.Statement.prepareStorable.

Compiler state variable.

ps:PreparedStatement

Doc from org.apache.derby.iapi.sql.Statement.prepareStorable.

Prepared statement

paramDefaults:Object[]

Parameter defaults

spsSchema:SchemaDescriptor

Doc from org.apache.derby.iapi.sql.Statement.prepareStorable.

schema of the stored prepared statement

internalSQL:boolean

Doc from org.apache.derby.iapi.sql.Statement.prepareStorable.

True if this is for Derby-internal SQL

Returns:PreparedStatement

A PreparedStatement that allows execution of the execution plan.

Exceptions

StandardException:: Thrown if this is an execution-only version of the module (the prepare() method relies on compilation).

prepMinion	back to summary
private PreparedStatement prepMinion(LanguageConnectionContext lcc, boolean cacheMe, Object[] paramDefaults, SchemaDescriptor spsSchema, boolean internalSQL) throws StandardException

walkAST	back to summary
private void walkAST(LanguageConnectionContext lcc, Visitable queryTree, int phase) throws StandardException Walk the AST, using a (user-supplied) Visitor

public Class GenericStatement

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