进行测试之前首先保证你已经可以对数据库进行读写:参见
要求:对MYSQL数据库的读写读写性能进行测试。支持多并发、支持调整事物提交记录数。
注意事项:
要运行测试需要
1. 需要修改数据库的配置信息DB_DRIVER、DB_URL、DB_USERNAME、DB_PASSWORD;
2.DB_URL中还要指定哪个数据库。“dbc:mysql://localhost:3306/test”其中的test就是我锁用的那个数据库;
3. 修改TABLE_NAME指定数据库测试的表名(此处是student表),测试程序会查询这个表的定义来生成写入SQL语句;
4.还有此语句 if (column.equalsIgnoreCase("name")) 中的那么为你创建的表的key,这个也要对用调整过来;
5. 修改concurrentList指定需要测试并发数列表,默认测试1,5,10,20四种并发数;
6. 修改batchSizeList指定每次测试的事务提交记录数据,默认是100,200,500,1000
最后运行测试,会生成类似下面的结果:
测试完成后检查该student表,输入select * from student; 可以看到源源不断的数据的输出,插入的表项太多了。
具体查了多少数据呢?使用select count(*) from student;查看。
可能遇到的问题:
(1)UUID.randomUUID().toString()生成的主键会很长,因此主键name的长度应设的长一些否则会出现如下报错:
由上上截图可以看到生成的主键还是蛮长的。
(2)每次测试的时候最好将上一次测试的table删除重新建一个。否则测试的数据之间相差很大。
建立student表的SQL语句如下:
--删除student表的SQL语句 drop table student; --查询表格项数大小的语句 select count(*) from student; --建立student表,注意key的预留空间较大 create table student (name varchar(120) not null, goal varchar(20) not null, primary key(name));
程序代码如下:
import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.sql.Timestamp; import java.sql.Types; import java.util.ArrayList; import java.util.Calendar; import java.util.Collections; import java.util.Formatter; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.Random; import java.util.UUID; import java.util.concurrent.CountDownLatch; import java.util.logging.Level; import java.util.logging.Logger; public class InsertTest { private static Logger logger = Logger.getLogger(InsertTest.class.getName()); //驱动程序名 private static final String DB_DRIVER = "com.mysql.cj.jdbc.Driver"; //URL指向要访问的数据库名mysql private static final String DB_URL = "jdbc:mysql://localhost:3306/test?rewriteBatchedStatements=true&useSSL=false&serverTimezone=UTC"; //MySQL配置时的用户名 private static final String DB_USERNAME = "root"; //MySQL配置时的密码 private static final String DB_PASSWORD = "…………"; private static Random random = new Random(10000); //我们要测试的表的名称 private static final String TABLE_NAME = "student"; private int batchSize;//一批提交的事务数 private int concurrent;// private int sampling;// public static void main(String[] args) throws Exception { printHeader(); int[] concurrentList = new int[]{1, 5, 10, 20};//默认测试1,5,10,20个并发 int[] batchSizeList = new int[] {100, 200, 500, 1000};//一批提交的事务数 for (int concurrent : concurrentList) { for (int batchSize : batchSizeList) { //对以上每种组合都run一次 new InsertTest(batchSize, concurrent).run(true); } Thread.sleep(10000); } } /*-----------InsertTest类的构造函数一-------------*/ public InsertTest(final int batchSize, final int concurrent) throws Exception { this.batchSize = batchSize; this.concurrent = concurrent; this.sampling = 100; } /*-----------InsertTest类的构造函数二-------------*/ public InsertTest(final int batchSize, final int concurrent, final int sampling) throws Exception { this.batchSize = batchSize; this.concurrent = concurrent; this.sampling = sampling; } /*-----------开始运行run方法-------------*/ public void run(boolean printResult) throws Exception { final Listresults = Collections.synchronizedList(new ArrayList ()); final CountDownLatch startGate = new CountDownLatch(concurrent); final CountDownLatch endGate = new CountDownLatch(concurrent); for (int idxConcurrent = 0; idxConcurrent < concurrent; idxConcurrent++) { new Thread(new Runnable() { public void run() { startGate.countDown(); try { long time = execute(); long avg = batchSize * sampling * 1000 / time;; results.add(Long.valueOf(avg)); } catch(Exception ex) { ex.printStackTrace(); } finally { endGate.countDown(); } } }).start(); } endGate.await(); Collections.sort(results); //每种组合跑完之后都打印出一行数据 if (printResult) { printResult(batchSize, concurrent, results); } } public long execute() throws Exception { Connection conn = getConnection(); Map columns = queryTableColumns(conn); String insertSQL = generateInsertSQL(columns); PreparedStatement ps = conn.prepareStatement(insertSQL); try { long start = System.currentTimeMillis(); for (int i = 0; i < sampling; i++) { execute(conn, ps, columns); } long stop = System.currentTimeMillis(); return stop - start; } catch(Exception ex) { logger.log(Level.SEVERE, null, ex); conn.rollback(); conn.close(); throw ex; } finally { conn.close(); } } //执行插入语句出错。 ps:INSERT INTO student1(name,goal)VALUES(** NOT SPECIFIED **,** NOT SPECIFIED **) public void execute(Connection conn, PreparedStatement ps, Map columns) throws Exception { try { for (int idx = 0; idx < batchSize; idx++) { int idxColumn = 1; //这个地方实际上是对每一列进行循环。(1)如果该列是key对应的列………… (2)该列为普通列 for (String column : columns.keySet()) { //如果该列为name列即key对应的列,就单独为他生成一个主键。 //为了执行忽略大小写的比较,使用equalsIgnoreCase if (column.equalsIgnoreCase("name")) { //给JDBC的SQL语句的占位符赋值的,即是下面的“? connection.prepareStatement("insert into t_user values (?,?)"); //UUID.randomUUID().toString()是java JDK提供的一个自动生成主键的方法。 ps.setObject(idxColumn, UUID.randomUUID().toString()); } //否则就是普通列,随便填充点东西进去就好了。 else { ps.setObject(idxColumn, generateColumnValue(columns.get(column))); } idxColumn ++; } ps.addBatch(); } //批量执行SQL语句 ps.executeBatch(); conn.commit(); ps.clearBatch(); } //如果上面出错了就捕获其异常 catch (SQLException ex) { logger.log(Level.SEVERE, null, ex); if (null != ex.getNextException()) { logger.log(Level.SEVERE, null, ex.getNextException()); } conn.rollback(); throw ex; } } //根据获取的列信息,生成插入的sql语句。 private String generateInsertSQL(Map columns) throws SQLException { StringBuilder sb = new StringBuilder(); StringBuffer sbColumns = new StringBuffer(); StringBuffer sbValues = new StringBuffer(); sb.append("INSERT INTO ").append(TABLE_NAME); for (String column : columns.keySet()) { if (sbColumns.length() > 0) { sbColumns.append(","); sbValues.append(","); } sbColumns.append(column); sbValues.append("?"); } sb.append("(").append(sbColumns).append(")"); sb.append("VALUES"); sb.append("(").append(sbValues).append(")"); return sb.toString(); } private Map queryTableColumns(Connection conn) throws Exception { Map columns = new LinkedHashMap (); String sql = "SELECT * FROM " + TABLE_NAME + " WHERE 1=0"; Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery(sql); ResultSetMetaData rsmd = rs.getMetaData(); for (int i = 1; i <= rsmd.getColumnCount(); i++) { columns.put(rsmd.getColumnName(i), rsmd.getColumnType(i)); } return columns; } //生成列值 private Object generateColumnValue(int type) { Object obj = null; switch (type) { case Types.DECIMAL: case Types.NUMERIC: case Types.DOUBLE: case Types.FLOAT: case Types.REAL: case Types.BIGINT: case Types.TINYINT: case Types.SMALLINT: case Types.INTEGER: obj = random.nextInt(10000); break; case Types.DATE: obj = Calendar.getInstance().getTime(); break; case Types.TIMESTAMP: obj = new Timestamp(System.currentTimeMillis()); break; default: obj = String.valueOf(random.nextInt(10000)); break; } return obj; } //连接MYSQL数据库。 private Connection getConnection() throws Exception { Class.forName(DB_DRIVER); Connection conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD); conn.setAutoCommit(false); return conn; } //打印出表头(即列的信息) private static void printHeader() { StringBuilder sb = new StringBuilder(); sb.append("\n"); sb.append(new Formatter().format("%15s|%15s|%15s|%15s|%15s", "BATCH_SIZE", "CONCURRENT", "AVG (r/s)", "MIN (r/s)", "MAX (r/s)")); System.out.println(sb.toString()); } //打印每次跑完后的统计信息 private static void printResult(int batch, int concurrent, List results) { Long total = Long.valueOf(0); for (Long result : results) { total += result; } StringBuilder sb = new StringBuilder(); sb.append(new Formatter().format("%15s|%15s|%15s|%15s|%15s", batch, concurrent, (total/results.size()), results.get(0), results.get(results.size() - 1))); System.out.println(sb.toString()); } }
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