运行以下代码需要什么设置和jar文件 . 我有jdk1.8.0_05，Hadoop 2.2.0和Hive 0.12.0 . 请帮忙 . 我试图在eclipse上运行此代码，但它没有编译 . 我已经添加了大约15个外部 jar 但没有用
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;
public class HiveJdbcClient {
private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
public static void main(String[] args) throws SQLException {
try {
Class.forName(driverName);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.exit(1);
}
Connection con = DriverManager.getConnection("jdbc:hive://localhost:10000/default", "", "");
Statement stmt = con.createStatement();
String tableName = "testHiveDriverTable";
stmt.executeQuery("drop table " + tableName);
ResultSet res = stmt.executeQuery("create table " + tableName + " (key int, value string)");
// show tables
String sql = "show tables '" + tableName + "'";
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
if (res.next()) {
System.out.println(res.getString(1));
}
// describe table
sql = "describe " + tableName;
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString(1) + "\t" + res.getString(2));
}
// load data into table
// NOTE: filepath has to be local to the hive server
// NOTE: /tmp/a.txt is a ctrl-A separated file with two fields per line
String filepath = "/tmp/a.txt";
sql = "load data local inpath '" + filepath + "' into table " + tableName;
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
// select * query
sql = "select * from " + tableName;
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(String.valueOf(res.getInt(1)) + "\t" + res.getString(2));
}
// regular hive query
sql = "select count(1) from " + tableName;
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString(1));
}
}
}
错误：：
java.lang.ClassNotFoundException：org.apache.hadoop.hive.jdbc.HiveDriver at java.net.URLClassLoader $ 1.run（URLClassLoader.java:372）at java.net.URLClassLoader $ 1.run（URLClassLoader.java:361）at at java.security.AccessController.doPrivileged（本机方法），位于java..LLCE文件管理器上的java.lang.ClassLoader.findClass（URLClassLoader.java:360），位于sun.misc.Launcher $ AppClassLoader的java.lang.ClassLoader.loadClass（ClassLoader.java:424） . loadClass（Launcher.java:308）at java.lang.ClassLoader.loadClass（ClassLoader.java:357）at java.lang.Class.forName0（Native Method）at java.lang.Class.forName（Class.java:259）在HiveJdbcClient.main（HiveJdbcClient.java:15）
2 回答
您必须将hive-jdbc-xxxx.jar添加到类路径中 . 我不知道你有什么Hadoop版本或Hadoop发行版，但是如果你使用的是最后一个Cloudera发行版，请从this archive下载 hive-0.12.0-cdh5.0.2.tar.gz 并将 /hive-0.12.0-cdh.5.0.2/hive-jdbc-0.12.0-cdh5.0.2.jar 包含到你的java类路径中 .
以下步骤将有助于解决问题：
将驱动器类替换为
org.apache.hive.jdbc.HiveDriver将
hive-jdbc-<version>.jar，common-logging-<version>.jar和hadoop-common-<version>.jar添加到classpath