greenplum版本

greenplum: 4.3.17.1

依赖引入

org.apache.commons

commons-dbcp2

2.8.0

org.postgresql

postgresql

42.2.17

org.apache.commons

commons-lang3

3.11

gp导入导出工具类

package com.qingzhongli.gp;

import org.apache.commons.lang3.StringUtils;

import org.postgresql.copy.CopyManager;

import org.postgresql.core.BaseConnection;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import javax.sql.DataSource;

import java.io.*;

import java.sql.Connection;

import java.sql.SQLException;

/**

* @author qingzhongli.com

*/

public class GpDataUtils {

private static Logger logger = LoggerFactory.getLogger(GpDataUtils.class);

/**

* @param dataSource

* @param sql

* @param delimiter

* @param filePath

* @param encode

* @param header

* @return

*/

public static long exportData(DataSource dataSource,

String sql,

String delimiter,

String filePath,

String encode,

boolean header) {

Connection con = null;

OutputStream out = null;

Writer writer = null;

try {

con = dataSource.getConnection();

CopyManager cm = new CopyManager(con.unwrap(BaseConnection.class));

StringBuffer sb = new StringBuffer();

sb.append("copy (");

sb.append(sql);

sb.append(" ) TO STDOUT ");

sb.append("WITH DELIMITER '");

sb.append(delimiter);

sb.append("'");

if (header) {

sb.append(" HEADER ");

}

String copySql = sb.toString();

logger.info("exportData data begin , sql is {}", copySql);

long startTime = System.currentTimeMillis();

File file = new File(filePath);

if (!file.getParentFile().exists()) {

file.getParentFile().mkdirs();

}

out = new FileOutputStream(file);

long handledRowCount = 0;

if (StringUtils.isNotEmpty(encode)) {

writer = new OutputStreamWriter(out, encode);

handledRowCount = cm.copyOut(copySql, writer);

} else {

handledRowCount = cm.copyOut(copySql, out);

}

long elapsedTime = System.currentTimeMillis() - startTime;

logger.info("exportData data end, sql is {}, elapsed time = {}", copySql, elapsedTime);

return handledRowCount;

} catch (Exception e) {

logger.error(e.getMessage(), e);

return 0L;

} finally {

if (out != null) {

try {

out.close();

} catch (IOException e) {

logger.error(e.getMessage(), e);

}

}

if (writer != null) {

try {

writer.close();

} catch (IOException e) {

logger.error(e.getMessage(), e);

}

}

if (con != null) {

try {

con.close();

} catch (SQLException e) {

logger.error(e.getMessage(), e);

}

}

}

}

/**

* @param dataSource

* @param table

* @param delimiter

* @param file

* @return

*/

public static long importData(DataSource dataSource,

String table,

String delimiter,

String file) {

Connection con = null;

InputStream in = null;

try {

logger.info("import data begin");

con = dataSource.getConnection();

CopyManager cm = new CopyManager(con.unwrap(BaseConnection.class));

StringBuffer sb = new StringBuffer();

sb.append("copy ");

sb.append(table);

sb.append(" from STDIN ");

sb.append("WITH DELIMITER '");

sb.append(delimiter);

sb.append("'");

String copySql = sb.toString();

logger.info("import data begin, sql is {}", copySql);

long startTime = System.currentTimeMillis();

in = new FileInputStream(file);

long handledRowCount = cm.copyIn(copySql, in);

long elapsedTime = System.currentTimeMillis() - startTime;

logger.info("import data end, sql is {}, elapsed time = {}", copySql, elapsedTime);

return handledRowCount;

} catch (Exception e) {

logger.error(e.getMessage(), e);

return 0L;

} finally {

if (in != null) {

try {

in.close();

} catch (IOException e) {

logger.error(e.getMessage(), e);

}

}

if (con != null) {

try {

con.close();

} catch (SQLException e) {

logger.error(e.getMessage(), e);

}

}

}

}

}

测试验证

测试数据准备(E:\temp\test.txt)，如下：

1,zhangsan

2,lisi

建立测试表，建表语句如下：

create table test (

id int,

name text

)

测试类，如下：

package com.qingzhongli.gp;

import org.apache.commons.dbcp2.BasicDataSource;

/**

* @author qingzhongli.com

*/

public class GpTest {

public static void main(String[] args) {

BasicDataSource ds = new BasicDataSource();

ds.setDriverClassName("org.postgresql.Driver");

ds.setUrl("jdbc:postgresql://192.168.37.90:5432/liqingzhong?gssEncMode=disable");

ds.setUsername("lqz");

ds.setPassword("Test123!@#");

ds.setMaxIdle(2);

ds.setInitialSize(1);

GpDataUtils.importData(ds, "test", ",", "E:\\temp\\test.txt");

}

}

运行测试类main方法，验证数据是否导入，如下：

[gpadmin@database-gp ~]$ psql -d liqingzhong -U test -h 192.168.37.90 -p 5432

Password for user test:

psql (8.2.15)

Type "help" for help.

liqingzhong=> select * from test;

id | name

----+----------

2 | lisi

1 | zhangsan

(2 rows)

liqingzhong=>

根据以上输出，数据已正常导入greenplum。

参考