Phoenix(四)JDBC CRUD操作

1. 说明

本篇主要介绍使用JDBC的方式来对HBase中的数据进行CRUD操作,项目为maven项目。请自行将phoenix-4.2.2-client.jar(可以在下载的phoenix-4.2.2-bin.tar.gz中找到该jar包)添加到项目的classpath中,将HBase集群的hbase-site.xml配置文件添加到项目的resources目录下。为了查看日志输出配置了一个简单的log4j.properties,也一并放到resources目录下。


log4j.properties 内容如下:

log4j.rootLogger=WARN, A1


# A1 is set to be a ConsoleAppender.
log4j.appender.A1=org.apache.log4j.ConsoleAppender

# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n


2. 获得连接

/** * project:hadoop-phoenix * file:BaseDB.java * time:2015年5月4日 下午2:19:57 * description: */
package cn.com.dimensoft.hadoop.phoenix.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;

/** * class: BaseDB * package: cn.com.dimensoft.hadoop.phoenix.jdbc * time: 2015年5月4日 下午2:19:57 * description: */
public class BaseDB {

    /** * * name:getConnection * time:2015年5月6日 下午2:07:06 * description: get JDBC connection * @return connection */
    public static Connection getConnection() {
        try {
            // load driver
            Class.forName("org.apache.phoenix.jdbc.PhoenixDriver");

            // get connection
            // jdbc 的 url 类似为 jdbc:phoenix [ :<zookeeper quorum> [ :<port number> ] [ :<root node> ] ],
            // 需要引用三个参数:hbase.zookeeper.quorum、hbase.zookeeper.property.clientPort、and zookeeper.znode.parent,
            // 这些参数可以缺省不填而在 hbase-site.xml 中定义。
            return DriverManager.getConnection("jdbc:phoenix");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}


3. 创建表

/** * * name:create * time:2015年5月4日 下午2:58:31 * description:create table */
    public static void create() {
        Connection conn = null;
        try {
            // get connection
            conn = BaseDB.getConnection();

            // check connection
            if (conn == null) {
                System.out.println("conn is null...");
                return;
            }

            // check if the table exist
            ResultSet rs = conn.getMetaData().getTables(null, null, "USER",
                    null);
            if (rs.next()) {
                System.out.println("table user is exist...");
                return;
            }
            // create sql
            String sql = "CREATE TABLE user (id varchar PRIMARY KEY,INFO.account varchar ,INFO.passwd varchar)";

            PreparedStatement ps = conn.prepareStatement(sql);

            // execute
            ps.execute();
            System.out.println("create success...");

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }


4. 插入数据

/** * * name:insert * time:2015年5月4日 下午2:59:11 * description: */
    public static void upsert() {

        Connection conn = null;
        try {
            // get connection
            conn = BaseDB.getConnection();

            // check connection
            if (conn == null) {
                System.out.println("conn is null...");
                return;
            }

            // create sql
            String sql = "upsert into user(id, INFO.account, INFO.passwd) values('001', 'admin', 'admin')";

            PreparedStatement ps = conn.prepareStatement(sql);

            // execute upsert
            String msg = ps.executeUpdate() > 0 ? "insert success..."
                    : "insert fail...";

            // you must commit
            conn.commit();
            System.out.println(msg);

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }


5. 查询数据

/** * * name:query * time:2015年5月4日 下午3:58:12 * description:query data */
    public static void query() {

        Connection conn = null;
        try {
            // get connection
            conn = BaseDB.getConnection();

            // check connection
            if (conn == null) {
                System.out.println("conn is null...");
                return;
            }

            // create sql
            String sql = "select * from user";

            PreparedStatement ps = conn.prepareStatement(sql);

            ResultSet rs = ps.executeQuery();

            System.out.println("id" + "\t" + "account" + "\t" + "passwd");
            System.out.println("======================");

            if (rs != null) {
                while (rs.next()) {
                    System.out.print(rs.getString("id") + "\t");
                    System.out.print(rs.getString("account") + "\t");
                    System.out.println(rs.getString("passwd"));
                }
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }


6. 更新数据

更新数据的操作与插入数据相同


7. 删除数据

/** * * name:delete * time:2015年5月4日 下午4:03:11 * description:delete data */
    public static void delete() {

        Connection conn = null;
        try {
            // get connection
            conn = BaseDB.getConnection();

            // check connection
            if (conn == null) {
                System.out.println("conn is null...");
                return;
            }

            // create sql
            String sql = "delete from user where id='001'";

            PreparedStatement ps = conn.prepareStatement(sql);

            // execute upsert
            String msg = ps.executeUpdate() > 0 ? "delete success..."
                    : "delete fail...";

            // you must commit
            conn.commit();
            System.out.println(msg);

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }


8. 删除表

/** * * name:drop * time:2015年5月4日 下午4:03:35 * description:drop table */
    public static void drop() {

        Connection conn = null;
        try {
            // get connection
            conn = BaseDB.getConnection();

            // check connection
            if (conn == null) {
                System.out.println("conn is null...");
                return;
            }

            // create sql
            String sql = "drop table user";

            PreparedStatement ps = conn.prepareStatement(sql);

            // execute
            ps.execute();

            System.out.println("drop success...");

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }

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