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Fixes all statement leaks in the driver. #455

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merged 6 commits into from
Aug 28, 2017

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peterbae
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Close all statements in the driver that are initialized locally but are never / sometimes not closed.

Fixes issue #308.

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@peterbae,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
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Microsoft Pull Request Bot

}
finally {
if (null != orgCat) {
if (null != rs)
rs.close();
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this method returns the resultset, so we should not close this resultset here

@@ -1035,6 +1036,10 @@ else if (resultSet != null) {
SQLServerException.makeFromDriverError(connection, this, form.format(msgArgs), null, true);
}
}
finally {
if (null != stmt)
stmt.close();
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this statement creates resultset which will be returned, closing this statement also closes the returned resultset, which is not what we want

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codecov-io commented Aug 22, 2017

Codecov Report

❗ No coverage uploaded for pull request base (dev@93e087c). Click here to learn what that means.
The diff coverage is 38.09%.

Impacted file tree graph

@@          Coverage Diff           @@
##             dev     #455   +/-   ##
======================================
  Coverage       ?   46.36%           
  Complexity     ?     2202           
======================================
  Files          ?      108           
  Lines          ?    25258           
  Branches       ?     4175           
======================================
  Hits           ?    11710           
  Misses         ?    11529           
  Partials       ?     2019
Flag Coverage Δ Complexity Δ
#JDBC41 46.23% <38.09%> (?) 2193 <0> (?)
#JDBC42 46.16% <38.09%> (?) 2194 <0> (?)
Impacted Files Coverage Δ Complexity Δ
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java 50.91% <ø> (ø) 161 <0> (?)
.../microsoft/sqlserver/jdbc/SQLServerXAResource.java 0% <0%> (ø) 0 <0> (?)
...soft/sqlserver/jdbc/SQLServerDatabaseMetaData.java 29.7% <0%> (ø) 49 <0> (?)
...oft/sqlserver/jdbc/SQLServerParameterMetaData.java 24.46% <62.5%> (ø) 32 <0> (?)
...oft/sqlserver/jdbc/SQLServerCallableStatement.java 29.19% <75%> (ø) 90 <0> (?)

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 93e087c...195719e. Read the comment docs.

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codecov-io commented Aug 22, 2017

Codecov Report

Merging #455 into dev will increase coverage by 0.03%.
The diff coverage is 32%.

Impacted file tree graph

@@             Coverage Diff              @@
##                dev     #455      +/-   ##
============================================
+ Coverage     46.33%   46.36%   +0.03%     
+ Complexity     2202     2198       -4     
============================================
  Files           108      108              
  Lines         25248    25264      +16     
  Branches       4170     4176       +6     
============================================
+ Hits          11698    11714      +16     
+ Misses        11531    11523       -8     
- Partials       2019     2027       +8
Flag Coverage Δ Complexity Δ
#JDBC41 46.26% <32%> (+0.08%) 2192 <0> (-2) ⬇️
#JDBC42 46.14% <32%> (+0.03%) 2191 <0> (+2) ⬆️
Impacted Files Coverage Δ Complexity Δ
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java 50.82% <0%> (+0.16%) 161 <0> (ø) ⬇️
.../microsoft/sqlserver/jdbc/SQLServerXAResource.java 0% <0%> (ø) 0 <0> (ø) ⬇️
...soft/sqlserver/jdbc/SQLServerDatabaseMetaData.java 29.7% <0%> (ø) 49 <0> (ø) ⬇️
...oft/sqlserver/jdbc/SQLServerParameterMetaData.java 24.35% <71.42%> (+0.37%) 31 <0> (ø) ⬇️
...oft/sqlserver/jdbc/SQLServerCallableStatement.java 29.19% <75%> (+0.03%) 90 <0> (ø) ⬇️
...om/microsoft/sqlserver/jdbc/SimpleInputStream.java 51.11% <0%> (-1.49%) 11% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java 32.49% <0%> (-0.37%) 239% <0%> (-3%)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java 42.2% <0%> (-0.22%) 46% <0%> (ø)
.../microsoft/sqlserver/jdbc/SQLServerConnection.java 45.84% <0%> (-0.08%) 274% <0%> (-2%)
... and 8 more

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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…nd added a statement field that can be closed after the prepared statement is closed.
}
finally {
if (null != orgCat) {
if (null != orgCat)
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I think we always omit the bracket when we can, so i did the same here.

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actually we started adding back the brackets even with one line of code, so lets keep the brackets here 😄

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done.

@@ -563,6 +563,8 @@ private void checkClosed() throws SQLServerException {
assert null != st;
stmtParent = st;
con = st.connection;
SQLServerStatement s = null;
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i guess s doesnt need to be instantiated to null but i did it for consistency

@@ -98,6 +98,9 @@

/** The prepared statement handle returned by the server */
private int prepStmtHandle = 0;

/** Statement used for getMetadata(). Declared as a field to facilitate closing the statement. */
private SQLServerStatement internalStmt = null;
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having internalStmt as a field is the only way to close it after the user is done working with the ResultsetMetadata.

@AfsanehR-zz AfsanehR-zz self-assigned this Aug 22, 2017
@cheenamalhotra cheenamalhotra added this to the 6.3.2 milestone Aug 24, 2017
@peterbae peterbae merged commit 490c169 into microsoft:dev Aug 28, 2017
@lilgreenbird lilgreenbird added this to Closed/Merged PRs in MSSQL JDBC Apr 27, 2022
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6 participants