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Barry Sham commented on DBCP-581: --------------------------------- Thanks for your suggestion. We will look into H2 and see if we can reproduce our test case on H2 as well. Besides, our teammate found flag *poolPreparedStatements* seems trigger the behavor like *maxStatements* which provided by DB2 driver for statement pooling purpose. We enabled trace log and found that the DBCP library calles *PreparedStatement.clearParameters()* after the update query execuated. Is there have any reference material for the +implemenation of statement pooling in DBCP+? Many thanks. > BigDecimal precision lossing when reusing prepared statement for INSERT / > UPDATE queries in DB2 > ----------------------------------------------------------------------------------------------- > > Key: DBCP-581 > URL: https://issues.apache.org/jira/browse/DBCP-581 > Project: Commons DBCP > Issue Type: Bug > Affects Versions: 1.4, 2.9.0 > Environment: *Java Version* > +DBCP 1.4+ > * IBM 64-bit SDK for Windows AMD64/EM64T architecture, Java Technology > Edition, Version 7 Release 1 > * Open JDK Zulu 8.31.0.1 > +DBCP 2.9.0+ > * Open JDK Zulu 8.31.0.1 > > *Database* > +IBM DB2 10.5+ > +IBM DB2 11.5+ > We are using IBM DB2 driver 4.25.13, but the problem exists in other versions > as well (see below) > * 3.69.76 > * 4.19.77 > * 4.25.13 > * 4.26.14 > * 4.27.25 > * 4.28.11 > * 4.29.24 > > +MySql Ver 8.0.17 for Linux on x86_64 (MySQL Community Server - GPL)+ > Reporter: Barry Sham > Priority: Blocker > Attachments: DBCPTest.zip > > > We use DBCP1.4 (with *poolPreparedStatements enabled*) to insert records that > contains {{*BigDecimal* and it will store into a *Decimal(11, 2)*}} column. > Although BigDecimal in the first insertion can be rounded up propertly, the > remains {color:#ff0000}_fails_{color}: (see the bottom output) > {code:java} > 2021-09-07 10:22:13:186 INFO JdbcDbcpTest:81 - JDK version 1.8.0_181 > 2021-09-07 10:22:13:190 INFO JdbcDbcpTest:83 - [Connection class: > org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper] > connected to jdbc:db2://localhost:50000/mydb > 2021-09-07 10:22:13:232 DEBUG JdbcDbcpTest:103 - [Perform 1 insert] 1 record > inserted (value = 0.10999999940395355224609375) > 2021-09-07 10:22:13:235 DEBUG JdbcDbcpTest:103 - [Perform 2 insert] 1 record > inserted (value = 100.10999999940395355224609375) > 2021-09-07 10:22:13:241 INFO JdbcDbcpTest:113 - Execute query SELECT DECTEST > FROM TBL_DECTEST > 2021-09-07 10:22:13:262 INFO CompareUtils:27 - ******************************* > 2021-09-07 10:22:13:263 INFO CompareUtils:28 - * Value set: [0.11, 100.10] > 2021-09-07 10:22:13:263 INFO CompareUtils:29 - > *******************************{code} > Then we upgraded the DBCP from 1.4 to 2.9.0 but the problem > {color:#ff0000}still exists{color}: (see the connection class in line 2) > {code:java} > 2021-09-07 10:22:13:533 INFO JdbcDbcpTest:81 - JDK version 1.8.0_181 > 2021-09-07 10:22:13:534 INFO JdbcDbcpTest:83 - [Connection class: > org.apache.commons.dbcp2.PoolingDataSource$PoolGuardConnectionWrapper] > connected to jdbc:db2://localhost:50000/mydb > 2021-09-07 10:22:13:562 DEBUG JdbcDbcpTest:103 - [Perform 1 insert] 1 record > inserted (value = 0.10999999940395355224609375) > 2021-09-07 10:22:13:564 DEBUG JdbcDbcpTest:103 - [Perform 2 insert] 1 record > inserted (value = 100.10999999940395355224609375) > 2021-09-07 10:22:13:571 INFO JdbcDbcpTest:113 - Execute query SELECT DECTEST > FROM TBL_DECTEST > 2021-09-07 10:22:13:574 INFO CompareUtils:27 - > ******************************* > 2021-09-07 10:22:13:574 INFO CompareUtils:28 - * Value set: [0.11, 100.10] > 2021-09-07 10:22:13:574 INFO CompareUtils:29 - > ******************************* {code} > We found all BigDecimal can rounded up properly if we *disable > poolPreparedStatements*. However this is not an option due to performance > condition. > Also we tried to insert BigDecimal with only JDBC and all BigDecimal rounded > up properly as well: > {code:java} > 2021-09-07 10:22:13:345 INFO JdbcDbcpTest:81 - JDK version 1.8.0_181 > 2021-09-07 10:22:13:345 INFO JdbcDbcpTest:83 - [Connection class: > com.ibm.db2.jcc.t4.b] connected to jdbc:db2://localhost:50000/mydb > 2021-09-07 10:22:13:364 DEBUG JdbcDbcpTest:103 - [Perform 1 insert] 1 record > inserted (value = 0.10999999940395355224609375) > 2021-09-07 10:22:13:371 DEBUG JdbcDbcpTest:103 - [Perform 2 insert] 1 record > inserted (value = 100.10999999940395355224609375) > 2021-09-07 10:22:13:372 INFO JdbcDbcpTest:113 - Execute query SELECT DECTEST > FROM TBL_DECTEST > 2021-09-07 10:22:13:374 INFO CompareUtils:27 - > ******************************* > 2021-09-07 10:22:13:374 INFO CompareUtils:28 - * Value set: [100.11, 0.11] > 2021-09-07 10:22:13:374 INFO CompareUtils:29 - > *******************************{code} > Sample Project: [maplecfiv/dbcp-test > (github.com)|https://github.com/maplecfiv/dbcp-test] > -- This message was sent by Atlassian Jira (v8.3.4#803005)