Java实现数据批量导入数据库(优化速度-2种方法)

连接数据程序

package db;
import java.sql.Connection;
import java.sql.DriverManager;
/*
*  合肥工业大学 管理学院 qianyang 1563178220@qq.com
*/
public class MySQLConnections {
private String driver = "";
private String dbURL = "";
private String user = "";
private String password = "";
private static MySQLConnections connection = null;

private MySQLConnections() throws Exception {
driver = "com.mysql.jdbc.Driver";
dbURL = "jdbc:mysql://127.0.0.1:3306/test";
user = "root";
password = "112233";
System.out.println("dbURL:" + dbURL);
}

public static Connection getConnection() {
Connection conn = null;
if (connection == null) {
try {
connection = new MySQLConnections();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
try {
Class.forName(connection.driver);
conn = DriverManager.getConnection(connection.dbURL,
connection.user, connection.password);
} catch (Exception e) {
e.printStackTrace();
}
return conn;

4000
}
}

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批量处理的两种方式

第一种方式，是每5000条记录放入数据库，一次。也就是每次提交的记录都有5000条，当然最后一次可能不是。另外，一种方式，是使用默认的提交方式。两者的处理速度都不错。50000条记录，大概15秒左右。

package db;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
/*
*  合肥工业大学 管理学院 qianyang 1563178220@qq.com
*/
public class MySQLUpdate {
static Connection con = MySQLConnections.getConnection();
static PreparedStatement stmt = null;
public static int executeInsert() throws SQLException {
int i = 0;
//设置批量处理的数量
int batchSize = 5000;
stmt = con.prepareStatement("insert into mysqltest (id,name) "
+ "values (?,?)");
// 关闭事务自动提交 ,这一行必须加上
con.setAutoCommit(false);
for (int j = 0; j < 50005; j++){
++i;
stmt.setInt(1, j);
stmt.setString(2, "name");
stmt.addBatch();
if ( i % batchSize == 0 ) {
stmt.executeBatch();
con.commit();
}
}
if ( i % batchSize != 0 ) {
stmt.executeBatch();
con.commit();
}
return i;
}

public static  void executeInsert2() throws SQLException {
// 关闭事务自动提交 ,这一行必须加上
con.setAutoCommit(false);
stmt = con.prepareStatement("insert into mysqltest1 (id,name) "
+ "values (?,?)");
for (int j = 0; j < 50002; j++){
stmt.setInt(1, j);
stmt.setString(2, "name");
stmt.addBatch();
}
stmt.executeBatch();
con.commit();
stmt.close();
con.close();
}

}

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main方法

package main;
import java.sql.SQLException;
import db.MySQLUpdate;
/*
*  合肥工业大学 管理学院 qianyang 1563178220@qq.com
*/
public class Test {

public static void main(String[] args) throws SQLException {
//      long begin1 = System.currentTimeMillis();
//      MySQLUpdate.executeInsert();
//      long end1 = System.currentTimeMillis();
//      System.out.println("程序运行时间为："+(end1-begin1));

long begin2 = System.currentTimeMillis();
MySQLUpdate.executeInsert1();
long end2 = System.currentTimeMillis();
System.out.println("程序运行时间为："+(end2-begin2));
}

}