Process all responses before proceed and fix retry logic for metadata caching

[xiangyushawn]

fix 2 issues in the driver related to metadata caching.

The issues are found by replacing throw with raiserror in the test, in order to run the test against SQL Server 2008

Repo code for first issue:
try_issue.txt

Another issue happens when using batching. The data is inserted/updated more times than expected.

[codecov-io]

Codecov Report

Merging #436 into dev will increase coverage by 0.06%.
The diff coverage is 89.47%.

@@             Coverage Diff              @@
##                dev     #436      +/-   ##
============================================
+ Coverage     46.25%   46.32%   +0.06%     
+ Complexity     2200     2197       -3     
============================================
  Files           108      108              
  Lines         25210    25215       +5     
  Branches       4164     4166       +2     
============================================
+ Hits          11662    11680      +18     
+ Misses        11519    11507      -12     
+ Partials       2029     2028       -1

Flag	Coverage Δ	Complexity Δ
#JDBC41	46.09% <84.21%> (+0.04%)	2183 <0> (-7)	⬇️
#JDBC42	46.16% <84.21%> (+0.03%)	2193 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	54.06% <100%> (+0.07%)	0 <0> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	59.65% <85.71%> (+0.28%)	130 <0> (ø)	⬇️
...va/com/microsoft/sqlserver/jdbc/StreamColumns.java	87.83% <0%> (-1.36%)	21% <0%> (-1%)
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	44.94% <0%> (-1.13%)	16% <0%> (-1%)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	59.17% <0%> (-0.65%)	88% <0%> (-1%)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.48% <0%> (-0.07%)	238% <0%> (-2%)
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	51% <0%> (+0.08%)	162% <0%> (+1%)	⬆️
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	45.83% <0%> (+0.11%)	274% <0%> (+1%)	⬆️
... and 4 more

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[codecov-io]

Codecov Report

Merging #436 into dev will decrease coverage by 0.04%.
The diff coverage is 62.5%.

@@             Coverage Diff              @@
##                dev     #436      +/-   ##
============================================
- Coverage     46.25%   46.21%   -0.05%     
- Complexity     2200     2201       +1     
============================================
  Files           108      108              
  Lines         25210    25235      +25     
  Branches       4164     4176      +12     
============================================
  Hits          11662    11662              
- Misses        11519    11555      +36     
+ Partials       2029     2018      -11

Flag	Coverage Δ	Complexity Δ
#JDBC41	46.03% <58.33%> (-0.02%)	2190 <2> (ø)
#JDBC42	46.08% <58.33%> (-0.06%)	2195 <2> (+2)

Impacted Files	Coverage Δ	Complexity Δ
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	50.45% <20%> (-0.47%)	157 <0> (-4)
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	59.39% <73.33%> (+0.02%)	135 <2> (+5)	⬆️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	53.44% <75%> (-0.54%)	0 <0> (ø)
...java/com/microsoft/sqlserver/jdbc/StringUtils.java	25% <0%> (-12.5%)	3% <0%> (-1%)
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	44.94% <0%> (-1.13%)	16% <0%> (-1%)
...n/java/com/microsoft/sqlserver/jdbc/Parameter.java	62.44% <0%> (-1.08%)	63% <0%> (+1%)
...va/com/microsoft/sqlserver/jdbc/StreamColInfo.java	78.26% <0%> (-0.91%)	6% <0%> (ø)
...va/com/microsoft/sqlserver/jdbc/StreamTabName.java	85% <0%> (-0.72%)	7% <0%> (ø)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	59.17% <0%> (-0.65%)	88% <0%> (-1%)
... and 19 more

---

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[xiangyushawn]

Hello @TobiasSQL , we know you are very busy, but if you could have a few minutes to take a look at this PR, it would be very helpful to us. Thank you 😃

[cheenamalhotra]

Method hasNextPacket() content can be compressed to:
return (null!=currentPacket.next);

[cheenamalhotra]

Method endOfCurrentPacket() content can be compressed to:
return (payload == currentPacket.payloadLength);

[xiangyushawn]

Things to verify for this fix:

• Make sure we don't lose error messages
• Only retry if the call was "exec sp_execute 14;" and not "INSERT t VALUES(1); exec sp_execute 14;"
• Manually get the handle and explicitly kill the handle for a specific error type.

[xiangyushawn]

close it due to new PR #543