我制作了一个 java 脚本,它将使用 Hiveserver2 连接到配置单元,并将创建表和管理表,用于简单的创建、删除、插入数据工作正常。
我想创建带分区的外部表,为此我需要更改以下配置单元属性的值,
hive.exec.dynamic.partition = true
hive.exec.dynamic.partition.mode = nonstrict
在 hive cli 中,我可以使用 SET 和属性名称来完成,但是如何在 java 代码中完成。
这是我的 Java 代码:
public class HiveJdbcClient {
private static String strDriverName = "org.apache.hive.jdbc.HiveDriver";
public static void main(String[] args) throws SQLException {
try{
Class.forName(strDriverName);
} catch (ClassNotFoundException e){
e.printStackTrace();
System.out.println("No class found");
System.exit(1);
}
Connection con = DriverManager.getConnection("jdbc:hive2://172.11.1.11:10000/default","root","root123");
Statement stmt = con.createStatement();
String strTableName = "testtable";
//stmt.execute("drop table " + strTableName);
//creating staging table that will load the data to partition data
String strStagingTableSql = "create table if not exists "+strTableName+"_staging "+ " (SEQUENCE_NO DECIMAL, DATE_KEY INT, ACTIVITY_TIME_KEY INT, Ds_KEY INT, Ds_VALUE DECIMAL, TL_DATE_KEY INT) ROW FORMAT DELIMITED FIELDS TERIMANTED BY '~'";
String strMainTableSql = "create external table if not exists "+strTableName+" (SEQUENCE_NO DECIMAL, ACTIVITY_TIME_KEY INT, Ds_KEY INT, Ds_VALUE DECIMAL, TL_DATE_KEY INT) PARTITIONED BY (DATE_KEY INT) ROW FORMAT DELIMITED FIELDS TERMINATED BY '~' LOCATION '/informatica/dwh/teradata/testtable'";
String strCreateSql = "create external table if not exists "+ strTableName + " (key int, value string) row format delimited fields terminated by ','";
boolean res = stmt.execute(strCreateSql);
//show tables
String sql = "show tables '" + strTableName + "'";
ResultSet res1 = stmt.executeQuery(sql);
if (res1.next()){
System.out.println(res1.getString(1));
}
sql = "describe "+ strTableName;
System.out.println("Running: "+ sql);
res1 = stmt.executeQuery(sql);
while (res1.next()){
System.out.println(res1.getString(1) + "\t" + res1.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 strFilepath = "/informatica/testing_hive_client_java.txt";
sql = "load data inpath '" + strFilepath + "' into table " + strTableName;
System.out.println("Running: " + sql);
res = stmt.execute(sql);
sql = "select count(1) from "+ strTableName;
System.out.println("Running: "+ sql);
res1 = stmt.executeQuery(sql);
while(res1.next()){
System.out.println(res1.getString(1));
}
}// end of main
}// end of class
请各位高手畅所欲言
最佳答案
我能够通过以下代码解决我的问题。
boolean resHivePropertyTest = stmt
.execute("SET hive.exec.dynamic.partition = true");
resHivePropertyTest = stmt
.execute("SET hive.exec.dynamic.partition.mode = nonstrict");
因为代码是 JDBC 客户端代码,所以执行将在配置单元中执行它,所以这对我有用。
关于jdbc - 如何从 Java 代码设置 Hive 配置属性 hive.exec.dynamic.partition,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30952186/