--刪除student表的SQL語(yǔ)句
drop table student;
--查詢表格項(xiàng)數(shù)大小的語(yǔ)句
select count(*) from student;
 
 
--建立student表，注意key的預(yù)留空間較大
create table student
(name varchar(120) not null, 
goal varchar(20) not null,
primary key(name));

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());
 
    //驅(qū)動(dòng)程序名  
    private static final String DB_DRIVER = "com.mysql.cj.jdbc.Driver";
    //URL指向要訪問(wèn)的數(shù)據(jù)庫(kù)名mysql
	private static final String DB_URL = "jdbc:mysql://localhost:3306/test?rewriteBatchedStatements=true&useSSL=false&serverTimezone=UTC";
	//MySQL配置時(shí)的用戶名
	private static final String DB_USERNAME = "root";
    //MySQL配置時(shí)的密碼
	private static final String DB_PASSWORD = "…………";
 
    private static Random random = new Random(10000);
    //我們要測(cè)試的表的名稱
    private static final String TABLE_NAME = "student";
    private int batchSize;//一批提交的事務(wù)數(shù)
    private int concurrent;//
    private int sampling;//
 
    public static void main(String[] args) throws Exception {
        printHeader();
 
        int[] concurrentList = new int[]{1, 5, 10, 20};//默認(rèn)測(cè)試1，5，10，20個(gè)并發(fā)
        int[] batchSizeList = new int[] {100, 200, 500, 1000};//一批提交的事務(wù)數(shù)
        for (int concurrent : concurrentList) {
            for (int batchSize : batchSizeList) {
            	//對(duì)以上每種組合都run一次
                new InsertTest(batchSize, concurrent).run(true);
            }
            Thread.sleep(10000);
        }
    }
   /*-----------InsertTest類的構(gòu)造函數(shù)一-------------*/
    public InsertTest(final int batchSize, final int concurrent) throws Exception {
        this.batchSize = batchSize;
        this.concurrent = concurrent;
        this.sampling = 100;
    }
    /*-----------InsertTest類的構(gòu)造函數(shù)二-------------*/
    public InsertTest(final int batchSize, final int concurrent, final int sampling) throws Exception {
        this.batchSize = batchSize;
        this.concurrent = concurrent;
        this.sampling = sampling;
    }
    
    /*-----------開(kāi)始運(yùn)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);
        //每種組合跑完之后都打印出一行數(shù)據(jù)
        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();
        }
    }
    //執(zhí)行插入語(yǔ)句出錯(cuò)。  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;
                //這個(gè)地方實(shí)際上是對(duì)每一列進(jìn)行循環(huán)。（1）如果該列是key對(duì)應(yīng)的列………… （2）該列為普通列
                for (String column : columns.keySet()) {
                	//如果該列為name列即key對(duì)應(yīng)的列，就單獨(dú)為他生成一個(gè)主鍵。
                	//為了執(zhí)行忽略大小寫的比較，使用equalsIgnoreCase
                    if (column.equalsIgnoreCase("name")) {
                    	//給JDBC的SQL語(yǔ)句的占位符賦值的,即是下面的“？   connection.prepareStatement("insert into t_user values (?,?)");
                        //UUID.randomUUID().toString()是java JDK提供的一個(gè)自動(dòng)生成主鍵的方法。
                        ps.setObject(idxColumn, UUID.randomUUID().toString());
                    } 
                    //否則就是普通列，隨便填充點(diǎn)東西進(jìn)去就好了。
                    else {
                        ps.setObject(idxColumn, generateColumnValue(columns.get(column)));
                    }
                    idxColumn ++;
                }
                ps.addBatch();
            }
            //批量執(zhí)行SQL語(yǔ)句
            ps.executeBatch();
            conn.commit();
 
            ps.clearBatch();
        } 
        //如果上面出錯(cuò)了就捕獲其異常
        catch (SQLException ex) {
            logger.log(Level.SEVERE, null, ex);
            if (null != ex.getNextException()) {
                logger.log(Level.SEVERE, null, ex.getNextException());
            }
            conn.rollback();
            throw ex;
        }
    }
    //根據(jù)獲取的列信息，生成插入的sql語(yǔ)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;
    }
    //連接MYSQL數(shù)據(jù)庫(kù)。
    private Connection getConnection() throws Exception {
        Class.forName(DB_DRIVER);
        Connection conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);
        conn.setAutoCommit(false);
        return conn;
    }
    //打印出表頭（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());
    }
    //打印每次跑完后的統(tǒng)計(jì)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());
    }
}