java - How to log SQL statements in Spring Boot?

Java - How to log SQL statements in Spring Boot?

Logging SQL statements in a Spring Boot application involves configuring the logging framework to capture and display SQL statements executed by the underlying data source. Here's how you can achieve this:

Using Spring Boot's Application.properties or Application.yml

In Spring Boot, you can configure logging settings using application.properties (or application.yml for YAML format). Here's how to configure logging of SQL statements:

  1. Configure Logging Level

    Set the logging level for Hibernate and Spring JDBC to DEBUG or TRACE. This will enable logging of SQL statements and related information.

    For application.properties:

    # Logging level for Hibernate logging.level.org.hibernate.SQL=DEBUG logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE # Logging level for Spring JDBC logging.level.org.springframework.jdbc.core=DEBUG

    For application.yml:

    logging: level: org.hibernate.SQL: DEBUG org.hibernate.type.descriptor.sql.BasicBinder: TRACE org.springframework.jdbc.core: DEBUG
    • org.hibernate.SQL: Logs SQL statements executed by Hibernate.
    • org.hibernate.type.descriptor.sql.BasicBinder: Logs parameter binding details for SQL statements.
    • org.springframework.jdbc.core: Logs SQL statements executed by Spring JDBC templates.

  2. Example Output

    After configuring the logging level, SQL statements executed by Hibernate and Spring JDBC operations will be logged to the console or log files (depending on your logging configuration). Here's an example of the logged output:

    2021-06-23 15:30:00.123 DEBUG 12345 --- [ main] org.hibernate.SQL : select product0_.id as id1_0_, product0_.name as name2_0_, product0_.price as price3_0_, product0_.description as descript4_0_ from products product0_ where product0_.id=?

Additional Considerations

  • Log Configuration: Ensure that your logging framework (e.g., Logback, Log4j2) is properly configured to output debug and trace messages. Refer to the specific logging framework's documentation for advanced configurations and customization.

  • Sensitive Information: Be cautious with logging SQL statements containing sensitive data. Ensure that sensitive data like passwords, personal information, etc., are not logged to maintain security and privacy.

  • Performance Impact: Logging SQL statements at DEBUG or TRACE levels can impact application performance. Use appropriate logging levels in production environments and monitor performance.

Using Logback Configuration (Optional)

If you need more fine-grained control over logging configuration, you can configure Logback (default logging framework in Spring Boot) directly in logback-spring.xml or logback.xml. Here's an example configuration:

<?xml version="1.0" encoding="UTF-8"?> <configuration> <!-- Console appender --> <appender name="console" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{35} - %msg%n</pattern> </encoder> </appender> <!-- Logging levels for Hibernate and Spring JDBC --> <logger name="org.hibernate.SQL" level="DEBUG" /> <logger name="org.hibernate.type.descriptor.sql.BasicBinder" level="TRACE" /> <logger name="org.springframework.jdbc.core" level="DEBUG" /> <!-- Root logger --> <root level="INFO"> <appender-ref ref="console" /> </root> </configuration>

Conclusion

Logging SQL statements in Spring Boot is essential for debugging database interactions and optimizing performance. By configuring the appropriate logging levels for Hibernate and Spring JDBC in application.properties or application.yml, you can easily capture and analyze SQL statements executed by your application. Adjust the logging levels based on your debugging needs and production environment considerations.

Examples

  1. Spring Boot log SQL queries to console

    • Description: Configure Spring Boot to log SQL statements (queries) to the console for debugging purposes.
    // Example: Log SQL queries to console in Spring Boot application.properties: spring.jpa.show-sql=true

    By setting spring.jpa.show-sql=true in your application.properties file, Spring Boot will log SQL queries to the console.

  2. Spring Boot log SQL queries to file

    • Description: Configure Spring Boot to log SQL statements (queries) to a file instead of the console.
    // Example: Log SQL queries to a file in Spring Boot application.properties: logging.file.name=sql.log spring.jpa.show-sql=true

    Set logging.file.name=sql.log along with spring.jpa.show-sql=true in application.properties to log SQL queries to sql.log file.

  3. Spring Boot log SQL queries with parameters

    • Description: Configure Spring Boot to log SQL statements (queries) along with their parameters for debugging.
    // Example: Log SQL queries with parameters in Spring Boot application.properties: spring.jpa.properties.hibernate.format_sql=true spring.jpa.show-sql=true logging.level.org.hibernate.type.descriptor.sql=TRACE

    Configure spring.jpa.properties.hibernate.format_sql=true, spring.jpa.show-sql=true, and logging.level.org.hibernate.type.descriptor.sql=TRACE in application.properties to log SQL queries with parameters.

  4. Spring Boot log SQL queries using AOP

    • Description: Implement an Aspect-Oriented Programming (AOP) approach to log SQL statements (queries) in Spring Boot.
    // Example: Log SQL queries using AOP in Spring Boot @Aspect @Component public class SqlQueryLoggingAspect { @Before("execution(* com.example.repository.*.*(..)) && args(.., entityManager)") public void logSqlQuery(EntityManager entityManager) { org.hibernate.engine.spi.QueryImplementor query = (org.hibernate.engine.spi.QueryImplementor) entityManager.createNamedQuery("dummy"); String queryString = query.getQueryString(); System.out.println("Executing SQL query: " + queryString); } }

    Implement an AOP aspect (SqlQueryLoggingAspect) in Spring Boot to log SQL queries before execution.

  5. Spring Boot log SQL queries with DataSource Proxy

    • Description: Use DataSource Proxy to log SQL statements (queries) in Spring Boot application.
    // Example: Log SQL queries with DataSource Proxy in Spring Boot @Bean @Profile("dev") public DataSource dataSource() { ProxyDataSource proxyDataSource = new ProxyDataSource(); proxyDataSource.setDataSource(dataSource()); proxyDataSource.setListener(new SLF4JQueryLoggingListener()); return proxyDataSource; }

    Configure a DataSource Proxy bean (dataSource()) with a SLF4JQueryLoggingListener to log SQL queries in development profile (@Profile("dev")).

  6. Spring Boot log Hibernate SQL queries

    • Description: Configure Spring Boot to log Hibernate SQL statements (queries) including parameters.
    // Example: Log Hibernate SQL queries in Spring Boot application.properties: spring.jpa.properties.hibernate.generate_statistics=true spring.jpa.show-sql=true logging.level.org.hibernate.SQL=DEBUG logging.level.org.hibernate.type.descriptor.sql=TRACE

    Set spring.jpa.properties.hibernate.generate_statistics=true, spring.jpa.show-sql=true, logging.level.org.hibernate.SQL=DEBUG, and logging.level.org.hibernate.type.descriptor.sql=TRACE in application.properties to log Hibernate SQL queries.

  7. Spring Boot log SQL queries with logback

    • Description: Configure logback to log SQL statements (queries) in a Spring Boot application.
    // Example: Log SQL queries with logback in Spring Boot <?xml version="1.0" encoding="UTF-8"?> <configuration> <appender name="SQL_FILE" class="ch.qos.logback.core.FileAppender"> <file>sql.log</file> <append>true</append> <encoder> <pattern>%date [%thread] %-5level %logger{35} - %msg%n</pattern> </encoder> </appender> <logger name="org.hibernate.SQL" level="DEBUG"/> <logger name="org.hibernate.type.descriptor.sql" level="TRACE"/> <root level="info"> <appender-ref ref="SQL_FILE"/> </root> </configuration>

    Configure logback (logback.xml) to log SQL queries (org.hibernate.SQL) and SQL parameters (org.hibernate.type.descriptor.sql) to sql.log file.

  8. Spring Boot log SQL queries with SLF4J

    • Description: Use SLF4J (Simple Logging Facade for Java) to log SQL statements (queries) in a Spring Boot application.
    // Example: Log SQL queries with SLF4J in Spring Boot import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; @Component public class SqlQueryLogger { private final Logger logger = LoggerFactory.getLogger(SqlQueryLogger.class); public void logSqlQuery(String query) { logger.info("Executing SQL query: {}", query); } }

    Implement a SqlQueryLogger component using SLF4J to log SQL queries in a Spring Boot application.

  9. Spring Boot log SQL queries with JPA listener

    • Description: Implement a JPA entity listener to log SQL statements (queries) in Spring Boot application.
    // Example: Log SQL queries with JPA listener in Spring Boot import javax.persistence.PostLoad; import javax.persistence.PrePersist; import javax.persistence.PreUpdate; public class SqlQueryEntityListener { @PrePersist @PreUpdate @PostLoad public void logSqlQuery(Object entity) { // Implement logging logic here System.out.println("SQL query logged: " + entity); } }

    Implement a SqlQueryEntityListener class with JPA lifecycle callbacks (@PrePersist, @PreUpdate, @PostLoad) to log SQL queries in a Spring Boot application.

  10. Spring Boot log SQL queries using Hibernate Interceptor

    • Description: Use a Hibernate Interceptor to log SQL statements (queries) in a Spring Boot application.
    // Example: Log SQL queries using Hibernate Interceptor in Spring Boot import org.hibernate.EmptyInterceptor; public class SqlQueryInterceptor extends EmptyInterceptor { @Override public String onPrepareStatement(String sql) { System.out.println("SQL query intercepted: " + sql); return super.onPrepareStatement(sql); } }

    Implement a SqlQueryInterceptor extending EmptyInterceptor to intercept and log SQL queries in a Spring Boot application using Hibernate.

More Tags

internet-options testing groupwise-maximum workflow-activity python-packaging amazon-kinesis-firehose notation horizontallist tidyverse topshelf

More Programming Questions

More Cat Calculators

More Gardening and crops Calculators

More Housing Building Calculators

More Chemistry Calculators