David Bennett QA Engineer April 15 th , 2015 Using MySQL with Java Q2 2014
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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
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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(); }}
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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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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 property
val 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.
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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.
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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.
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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.
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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.
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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 Client Maintained-ed by MariaDB team Fork from Drizzle JDBC Stable release 1.1.8 Compatible with:
✔ MySQL✔ Percona Server / PXC✔ MariaDB
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Alternative JDBC Driver
● Pros Maybe be faster in some cases It is under active development
Cons Not as feature rich Not 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
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