David BennettQA Engineer

April 15th, 2015

Using MySQL with JavaQ2 2014

www.percona.com2

Who are you?

Java Experts, Intermediate, Beginners

MySQL Experts, Intermediate, Beginners

Developers, DBAs, System Admins

Just interested

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Me

QA Engineer at Percona Designer/Developer/Consultant 20+ years in technology 15+ years working with MySQL 15+ years working with Java Focused on web apps Linux devotee I love MySQL, I like Java

Dave Bennett

www.percona.com4

Basic Topology

Java Application(Web, Service, Desktop)

Java Runtime Engine(JRE)

JDBC Interface

JDBC Driver (Connector/J)

MySQL

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What is JDBC?

A standardized interface between Java and SQL

JDBC is to Java what ODBC is to Windows

Virtually all Java/SQL applications use JDBC

Like ODBC, JDBC is used more and more on

Servers, Desktop use waning.

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What is Connector/J?

Most widely used JDBC Driver for MySQL today

Started life in 1998 as MM.MySQL (M. Matthews)

Acquired by MySQL AB in 2002

Owned by Oracle today, available under GPLv2

JDBC Type 4 – 100% Java – No Middleware

www.percona.com7

import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

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import java.sql.*;public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); }}

16 www.percona.com

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Connector/J Basic* URL

jdbc:mysql://[host][:port]/[database][?prop=val[&prop=val]]

Where: is:host TCP/IP host (defaults to IPV4 127.0.0.1)port TCP/IP port (defaults to 3306)database Database name (defaults to none)prop A configuration propertyval The configuration property's value

* There are more advanced options for other protocols (IPV6, Named Pipes), replication, failover, load balancing, etc...

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Connector/J URL Examples

jdbc:mysql://Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserverConnect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserver:3307/mydbConnect the MySQL server dbserver on port 3307 using database mydb.

jdbc:mysql://dbserver/mydbConnect the MySQL server dbserver on port 3306 using database mydb.

www.percona.com19

Connector/J URL Examples

jdbc:mysql://Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserverConnect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserver:3307/mydbConnect the MySQL server dbserver on port 3307 using database mydb.

jdbc:mysql://dbserver/mydbConnect the MySQL server dbserver on port 3306 using database mydb.

www.percona.com20

Connector/J URL Examples

jdbc:mysql://Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserverConnect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserver:3307/mydbConnect the MySQL server dbserver on port 3307 using database mydb.

jdbc:mysql://dbserver/mydbConnect the MySQL server dbserver on port 3306 using database mydb.

www.percona.com21

Connector/J URL Examples

jdbc:mysql://Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserverConnect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserver:3307/mydbConnect the MySQL server dbserver on port 3307 using database mydb.

jdbc:mysql://dbserver/mydbConnect the MySQL server dbserver on port 3306 using database mydb.

www.percona.com22

Connector/J URL Examples

jdbc:mysql://Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserverConnect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries.

jdbc:mysql://dbserver:3307/mydbConnect the MySQL server dbserver on port 3307 using database mydb.

jdbc:mysql://dbserver/mydbConnect the MySQL server dbserver on port 3306 using database mydb.

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Connector/J parametersPassing in JDBC URL:

dbProperties.load(MyClass.class.getClassLoader().getResourceAsStream("db.properties"));

Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties);

Passing in a Properties file:

Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance");

MysqlDataSource mds=new MysqlDataSource();mds.setUrl("jdbc:mysql://");mds.setUser("user");mds.setPassword("pwd");mds.setAutoReconnect(true);mds.setUseConfigs("maxPerformance");Connection con=mds.getConnection();

Passing from MysqlDataSource set*() methods:

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Connector/J parametersPassing in JDBC URL:

dbProperties.load(MyClass.class.getClassLoader().getResourceAsStream("db.properties"));

Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties);

Passing in a Properties file:

Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance");

MysqlDataSource mds=new MysqlDataSource();mds.setUrl("jdbc:mysql://");mds.setUser("user");mds.setPassword("pwd");mds.setAutoReconnect(true);mds.setUseConfigs("maxPerformance");Connection con=mds.getConnection();

Passing from MysqlDataSource set*() methods:

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Connector/J parametersPassing in JDBC URL:

dbProperties.load(MyClass.class.getClassLoader().getResourceAsStream("db.properties"));

Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties);

Passing in a Properties file:

Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance");

MysqlDataSource mds=new MysqlDataSource();mds.setUrl("jdbc:mysql://");mds.setUser("user");mds.setPassword("pwd");mds.setAutoReconnect(true);mds.setUseConfigs("maxPerformance");Connection con=mds.getConnection();

Passing from MysqlDataSource set*() methods:

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Connector/J parametersPassing in JDBC URL:

dbProperties.load(MyClass.class.getClassLoader().getResourceAsStream("db.properties"));

Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties);

Passing in a Properties file:

Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance");

MysqlDataSource mds=new MysqlDataSource();mds.setUrl("jdbc:mysql://");mds.setUser("user");mds.setPassword("pwd");mds.setAutoReconnect(true);mds.setUseConfigs("maxPerformance");Connection con=mds.getConnection();

Passing from MysqlDataSource set*() methods:

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Generic JDBC App Exampleimport java.io.IOException;import java.sql.*;import java.util.Properties;public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %s\n",rs.getString("version")); } rs.close(); st.close(); con.close(); }}

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Generic JDBC App Exampleimport java.io.IOException;import java.sql.*;import java.util.Properties;public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %s\n",rs.getString("version")); } rs.close(); st.close(); con.close(); }}

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Generic JDBC App Exampleimport java.io.IOException;import java.sql.*;import java.util.Properties;public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %s\n",rs.getString("version")); } rs.close(); st.close(); con.close(); }}

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Generic JDBC App Exampledb.properties configured for MySQL:# driverclass=com.mysql.jdbc.Driver# connection urlurl=jdbc:mysql://localhostuser=userpassword=pwd# parametersautoReconnect=trueuseConfigs=maxPerformance# version queryversionQuery=SELECT CONCAT_WS(' ',@@version_comment,@@version,\ @@version_compile_os,@@version_compile_machine) AS `version`

Returns:

Hello from MySQL Community Server (GPL) 5.6.23-log Linux x86_64

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Prepared Statements

Security – Better protection from SQL injection attacks, parameters are sent separately, escaping unnecessary

Performance – Prepared Statements are re-usable. Interpretation and Optimization happens only once.

More Performance – Combined with Pooling/Caching.

Use them whenever you can.

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Let's do something useful

Runs as a service, records storage capacity to a table Runs as a report, outputs capacity growth over time Load JDBC configuration from a Java properties file PreparedStatement Query with ResultSet Use and Reuse of PreparedStatement Batch inserts using addBatch/executeBatch Dynamic DDL creation

DiskFreeChecker.javagithub.com/dbpercona/DiskFreeChecker

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Querypst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?");pst.setString(1, hostname);pst.setTimestamp(2, ts);rs=pst.executeQuery();while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe);}rs.close(); pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Reusepst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?");// thenpst.setBigDecimal(1, secondsBack);pst.setString(2, hostname);rs = pst.executeQuery();if (rs.next()) { then = rs.getTimestamp(1);}rs.close();// nowpst.setInt(1, 0);rs = pst.executeQuery();if (rs.next()) { now = rs.getTimestamp(1);}rs.close();pst.close();

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Batchespst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)");

for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch}int[] inserts=pst.executeBatch(); // execute batchint totalInserts=0;for (int i : inserts) totalInserts += i; // compute total

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Prepared Statement Writes

int keepDays=30;String strKeepDays=dbp.getProperty("keep.days");if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue();

pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)");

pst.setInt(1, keepDays);pst.execute();

int updateCount=pst.getUpdateCount();if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries.");else System.out.println("No old entries to clean up.");

pst.close();

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int keepDays=30;String strKeepDays=dbp.getProperty("keep.days");if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue();

pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)");

pst.setInt(1, keepDays);pst.execute();

int updateCount=pst.getUpdateCount();if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries.");else System.out.println("No old entries to clean up.");

pst.close();

Prepared Statement Writes

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Prepared Statement Writes

int keepDays=30;String strKeepDays=dbp.getProperty("keep.days");if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue();

pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)");

pst.setInt(1, keepDays);pst.execute();

int updateCount=pst.getUpdateCount();if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries.");else System.out.println("No old entries to clean up.");

pst.close();

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Prepared Statement Writes

int keepDays=30;String strKeepDays=dbp.getProperty("keep.days");if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue();

pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)");

pst.setInt(1, keepDays);pst.execute();

int updateCount=pst.getUpdateCount();if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries.");else System.out.println("No old entries to clean up.");

pst.close();

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Prepared Statement Writes

int keepDays=30;String strKeepDays=dbp.getProperty("keep.days");if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue();

pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)");

pst.setInt(1, keepDays);pst.execute();

int updateCount=pst.getUpdateCount();if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries.");else System.out.println("No old entries to clean up.");

pst.close();

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Performance parameters

Parameter What it doescachePrepStmts=true If true, cache prepared statements on client side

cacheCallableStmts=true If true, cache prepared stored procedure calls

CacheServerConfiguration=true

If true, reduces connect queries by caching server configuration variables.

useLocalSessionState=true If true, reduces setup queries by using the local session state

elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting.

AlwaysSendSetIsolation=false

If false, doesn't set the transaction isolation level on connect. Uses server default isolation level

enableQueryTimeouts=false If false, disables query timeouts

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Performance parameters

Parameter What it does

cachePrepStmts=true If true, cache prepared statements on client side

cacheCallableStmts=true If true, cache prepared stored procedure calls

CacheServerConfiguration=true

If true, reduces connect queries by caching server configuration variables.

useLocalSessionState=true If true, reduces setup queries by using the local session state

elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting.

AlwaysSendSetIsolation=false

If false, doesn't set the transaction isolation level on connect. Uses server default isolation level

enableQueryTimeouts=false If false, disables query timeouts

useConfigs=maxPerformance

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Debugging parameters

Parameter What it doesprofileSQL=true If true, log query execution times to the

configured logger.

gatherPerfMetrics=true If true, collect performance metrics to the configured logger.

useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings.

logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis)

explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger.

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Debugging parameters

Parameter What it doesprofileSQL=true If true, log query execution times to the

configured logger.

gatherPerfMetrics=true If true, collect performance metrics to the configured logger.

useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings.

logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis)

explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger.

useConfigs=fullDebug

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Other Handy Parameters

autoReconnect

characterEncoding

useInformationSchema

maxRows

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Alternative JDBC Driver

MariaDB Java ClientMaintained-ed by MariaDB teamFork from Drizzle JDBCStable release 1.1.8Compatible with:

MySQL Percona Server / PXC MariaDB

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Alternative JDBC Driver

ProsMaybe be faster in some casesIt is under active development

ConsNot as feature richNot as mature

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What to learn about next

Connection Pooling

DBCP, C3P0, BoneCP

JNDI / Container Managed

DataSource, Spring

Object Relational Mapping

JPA, Hibernate, Spring

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THANK YOU