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Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The Configuration lets you specify a list of org.jooq.ExecuteListener instances. The ExecuteListener is essentially an event listener for Query, Routine, or ResultSet render, prepare, bind, execute, fetch steps. It is a base type for loggers, debuggers, profilers, data collectors, triggers, etc. Advanced ExecuteListeners can also provide custom implementations of Connection, PreparedStatement and ResultSet to jOOQ in apropriate methods.

Example: Query statistics ExecuteListener

Here is a sample implementation of an ExecuteListener, that is simply counting the number of queries per type that are being executed using jOOQ:

package com.example;

public class StatisticsListener implements ExecuteListener {

     * Generated UID
    private static final long                     serialVersionUID = 7399239846062763212L;

    public static final Map<ExecuteType, Integer> STATISTICS       = new ConcurrentHashMap<>();

    public void start(ExecuteContext ctx) {
        STATISTICS.compute(ctx.type(), (k, v) -> v == null ? 1 : v + 1);

Now, configure jOOQ's runtime to load your listener

// Create a configuration with an appropriate listener provider:
Configuration configuration = new DefaultConfiguration().set(connection).set(dialect);
configuration.set(new DefaultExecuteListenerProvider(new StatisticsListener()));

// Create a DSLContext from the above configuration
DSLContext create = DSL.using(configuration);

And log results any time with a snippet like this:


for (ExecuteType type : ExecuteType.values()) {
    log.info(type.name(), StatisticsListener.STATISTICS.get(type) + " executions");

This may result in the following log output:

15:16:52,982  INFO - TEST STATISTICS
15:16:52,982  INFO - ---------------
15:16:52,983  INFO - READ                     : 919 executions
15:16:52,983  INFO - WRITE                    : 117 executions
15:16:52,983  INFO - DDL                      : 2 executions
15:16:52,983  INFO - BATCH                    : 4 executions
15:16:52,983  INFO - ROUTINE                  : 21 executions
15:16:52,983  INFO - OTHER                    : 30 executions

Please read the ExecuteListener Javadoc for more details

Example: Custom Logging ExecuteListener

The following depicts an example of a custom ExecuteListener, which pretty-prints all queries being executed by jOOQ to stdout:

import org.jooq.DSLContext;
import org.jooq.ExecuteContext;
import org.jooq.ExecuteListener;
import org.jooq.conf.Settings;
import org.jooq.tools.StringUtils;

public class PrettyPrinter implements ExecuteListener {

     * Hook into the query execution lifecycle before executing queries
    public void executeStart(ExecuteContext ctx) {

        // Create a new DSLContext for logging rendering purposes
        // This DSLContext doesn't need a connection, only the SQLDialect...
        DSLContext create = DSL.using(ctx.dialect(),

        // ... and the flag for pretty-printing
            new Settings().withRenderFormatted(true));

        // If we're executing a query
        if (ctx.query() != null) {

        // If we're executing a routine
        else if (ctx.routine() != null) {

See also the manual's sections about logging for more sample implementations of actual ExecuteListeners.

Example: Bad query execution ExecuteListener

You can also use ExecuteListeners to interact with your SQL statements, for instance when you want to check if executed UPDATE or DELETE statements contain a WHERE clause. This can be achieved trivially with the following sample ExecuteListener:

public class DeleteOrUpdateWithoutWhereListener implements ExecuteListener {

    public void renderEnd(ExecuteContext ctx) {
        if (ctx.sql().matches("^(?i:(UPDATE|DELETE)(?!.* WHERE ).*)$")) {
            throw new DeleteOrUpdateWithoutWhereException();

public class DeleteOrUpdateWithoutWhereException extends RuntimeException {}

You might want to replace the above implementation with a more efficient and more reliable one, of course.


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