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:
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--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:
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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 List<Long> results = Collections.synchronizedList( new ArrayList<Long>()); 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<String, Integer> 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<String, Integer> 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<String, Integer> 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<String, Integer> queryTableColumns(Connection conn) throws Exception { Map<String, Integer> columns = new LinkedHashMap<String, Integer>(); 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<Long> 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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原文链接:https://blog.csdn.net/mijichui2153/article/details/81434816