@@ -761,17 +761,16 @@ Query OK, 1 row(s) in set (0.000141s)
...
@@ -761,17 +761,16 @@ Query OK, 1 row(s) in set (0.000141s)
you see sample code here: [JDBC example](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC)
you see sample code here: [JDBC example](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC)
## FAQ
## FAQ
- Why does not addBatch and executeBatch provide a performance benefit for executing "batch writes/updates"?
**Cause**:In TDengine's JDBC implementation, SQL statements submitted through the addBatch method are executed in the order in which they are added. This method does not reduce the number of interactions with the server and does not improve performance.
**Answer**：1. Concatenate multiple values in an INSERT statement; 2. Use multi-threaded concurrent insertion; 3. Use the parameter-binding to write
- java.lang.UnsatisfiedLinkError: no taos in java.library.path
- java.lang.UnsatisfiedLinkError: no taos in java.library.path
**Cause**：The application program cannot find Library function *taos*
**Cause**：The application program cannot find Library function *taos*
**Answer**：Copy `C:\TDengine\driver\taos.dll` to `C:\Windows\System32\` on Windows and make a soft link through `ln -s /usr/local/taos/driver/libtaos.so.x.x.x.x /usr/lib/libtaos.so` on Linux.
**Answer**：Copy `C:\TDengine\driver\taos.dll` to `C:\Windows\System32\` on Windows and make a soft link through `ln -s /usr/local/taos/driver/libtaos.so.x.x.x.x /usr/lib/libtaos.so` on Linux.
- java.lang.UnsatisfiedLinkError: taos.dll Can't load AMD 64 bit on a IA 32-bit platform
- java.lang.UnsatisfiedLinkError: taos.dll Can't load AMD 64 bit on a IA 32-bit platform
**Cause**：Currently TDengine only support 64bit JDK
**Cause**：Currently TDengine only support 64bit JDK
**Answer**：re-install 64bit JDK.
**Answer**：re-install 64bit JDK.
- For other questions, please refer to [Issues](https://github.com/taosdata/TDengine/issues)
- For other questions, please refer to [Issues](https://github.com/taosdata/TDengine/issues)
tdSql.query(f'select {table_name_sub1},{table_name_sub2},{table_name_sub3},{table_name_sub4},{table_name_sub5},{table_name_sub6},{table_name_sub7},{table_name_sub8},{table_name_sub9} from {table_name} where tbname in ("{table_name_sub1}","{table_name_sub2}","{table_name_sub3}","{table_name_sub4}","{table_name_sub5}","{table_name_sub6}","{table_name_sub7}","{table_name_sub8}","{table_name_sub9}") and ts >= "1980-01-01 00:00:00.000"')
tdSql.query(f'select {table_name_sub1},{table_name_sub2},{table_name_sub3},{table_name_sub4},{table_name_sub5},{table_name_sub6},{table_name_sub7},{table_name_sub8},{table_name_sub9} from {table_name} where tbname in ("{table_name_sub1}","{table_name_sub2}","{table_name_sub3}","{table_name_sub4}","{table_name_sub5}","{table_name_sub6}","{table_name_sub7}","{table_name_sub8}","{table_name_sub9}") and ts >= "1980-01-01 00:00:00.000"')
tdSql.execute("insert into sub_%s using st tags('host_%s' , %d) values (%d , %d , %f );"%(str(i),str(i),i*10,self.ts+200*i,i*2,i+10.00))
print(taos_cmd1)
tdSql.execute("insert into sub_%s using st tags('host_%s' , %d) values (%d , %d , %f );"%(str(i),str(i),i*10,self.ts+300*i,i*2,i+10.00))
taos_cmd2='taos -s "create table test_TD11483.elapsed_vol as select elapsed(ts) from test_TD11483.stb interval(1m) sliding(30s)"'
tdSql.execute("insert into sub_%s using st tags('host_%s' , %d) values (%d , %d , %f );"%(str(i),str(i),i*10,self.ts+10000*i,i*2,i+10.00))
taos_cmd3='taos -s "show queries;"'
taos_cmd4='taos -s "show streams;"'
cfg_path=self.getcfgPath()
print(cfg_path)
tdSql.execute('select elapsed(ts,10s) from testdb.st where ts>=\"2015-01-01 00:00:00.000\" and ts < \"2015-01-01 00:10:00.000\" session(ts,1d) group by tbname;')# session not support super table
taos_cmd1="taos -c %s -s 'select elapsed(ts,10s) from testdb.st where ts>=\"2015-01-01 00:00:00.000\" and ts < \"2015-01-01 00:10:00.000\" session(ts,1d) group by tbname;' "%(cfg_path)
