net.hydromatic.quidem

Class Quidem

java.lang.Object

net.hydromatic.quidem.Quidem

public class Quidem
extends Object

Runs a SQL script.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Quidem.ConnectionFactory Creates a connection for a given name.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	DEBUG
static com.google.common.base.Function<String,Object>	EMPTY_ENV The empty environment.

Constructor Summary

Constructors

Constructor and Description
Quidem(BufferedReader reader, Writer writer) Creates a Quidem interpreter with an empty environment.
Quidem(BufferedReader reader, Writer writer, com.google.common.base.Function<String,Object> env) Creates a Quidem interpreter.

Method Summary

Methods

Modifier and Type	Method and Description
void	execute(Quidem.ConnectionFactory connectionFactory)
boolean	isProbablyDeterministic(String sql) Returns whether a SQL query is likely to produce results always in the same order.
static void	main(String[] args)
static void	main2(List<String> args, PrintWriter out)
void	setStackLimit(int stackLimit) Sets the maximum number of characters of an error stack to be printed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEBUG

public static final boolean DEBUG

EMPTY_ENV

public static final com.google.common.base.Function<String,Object> EMPTY_ENV

The empty environment. Returns null for all variables.

Constructor Detail

Quidem

public Quidem(BufferedReader reader,
      Writer writer)

Creates a Quidem interpreter with an empty environment.

Quidem

public Quidem(BufferedReader reader,
      Writer writer,
      com.google.common.base.Function<String,Object> env)

Creates a Quidem interpreter.

Method Detail

main

public static void main(String[] args)

main2

public static void main2(List<String> args,
         PrintWriter out)
                  throws Exception

Throws:

Exception

execute

public void execute(Quidem.ConnectionFactory connectionFactory)

setStackLimit

public void setStackLimit(int stackLimit)

Sets the maximum number of characters of an error stack to be printed.

If negative, does not limit the stack size.

The default is DEFAULT_MAX_STACK_LENGTH.

Useful because it prevents diff from running out of memory if the error stack is very large. It is preferable to produce a result where you can see the first N characters of each stack trace than to produce no result at all.

Parameters:

stackLimit - Maximum number of characters to print of each stack trace

isProbablyDeterministic

public boolean isProbablyDeterministic(String sql)

Returns whether a SQL query is likely to produce results always in the same order.

If Quidem believes that the order is deterministic, it does not sort the rows before comparing them.

The result is just a guess. Quidem does not understand the finer points of SQL semantics.

Parameters:

sql - SQL query

Returns:

Whether the order is likely to be deterministic