From 48d34d65928010cf022913bf0126629604a6398d Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Tue, 30 Jan 2007 02:52:04 +0000
Subject: More work to ensure JDBC resources are properly cleaned up.

---
 .../com/amazon/carbonado/repo/jdbc/JDBCCursor.java | 16 +++------
 .../amazon/carbonado/repo/jdbc/JDBCStorage.java    | 40 ++++++++++++++++------
 2 files changed, 34 insertions(+), 22 deletions(-)

(limited to 'src/main/java/com/amazon/carbonado')

diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
index fa80fde..13c7548 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
@@ -41,6 +41,10 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
     private ResultSet mResultSet;
     private boolean mHasNext;
 
+    /**
+     * @throws SQLException from executeQuery on statement. Caller must clean
+     * up when this happens by closing statement and connection.
+     */
     JDBCCursor(JDBCStorage<S> storage,
                Connection con,
                PreparedStatement statement)
@@ -49,17 +53,7 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
         mStorage = storage;
         mConnection = con;
         mStatement = statement;
-        try {
-            mResultSet = statement.executeQuery();
-        } catch (SQLException e) {
-            try {
-                statement.close();
-                storage.mRepository.yieldConnection(con);
-            } catch (Exception e2) {
-                // Don't care.
-            }
-            throw e;
-        }
+        mResultSet = statement.executeQuery();
     }
 
     public void close() throws FetchException {
diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
index d6ceb62..6034227 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
@@ -460,14 +460,24 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
             Connection con = mRepository.getConnection();
             try {
                 PreparedStatement ps = con.prepareStatement(prepareSelect(values, forUpdate));
-                setParameters(ps, values);
-                return new JDBCCursor<S>(JDBCStorage.this, con, ps);
+                try {
+                    setParameters(ps, values);
+                    return new JDBCCursor<S>(JDBCStorage.this, con, ps);
+                } catch (Exception e) {
+                    // in case of exception, close statement
+                    try {
+                        ps.close();
+                    } catch (SQLException e2) {
+                        // ignore and allow triggering exception to propagate
+                    }
+                    throw e;
+                }
             } catch (Exception e) {
-                //in case of exception, yield connection
+                // in case of exception, yield connection
                 try {
                     mRepository.yieldConnection(con);
                 } catch (FetchException e2) {
-                   //ignore and allow triggering exception to propagate
+                   // ignore and allow triggering exception to propagate
                 }
                 throw mRepository.toFetchException(e);
             }
@@ -478,13 +488,17 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
             Connection con = mRepository.getConnection();
             try {
                 PreparedStatement ps = con.prepareStatement(prepareCount(values));
-                setParameters(ps, values);
-                ResultSet rs = ps.executeQuery();
                 try {
-                    rs.next();
-                    return rs.getLong(1);
+                    setParameters(ps, values);
+                    ResultSet rs = ps.executeQuery();
+                    try {
+                        rs.next();
+                        return rs.getLong(1);
+                    } finally {
+                        rs.close();
+                    }
                 } finally {
-                    rs.close();
+                    ps.close();
                 }
             } catch (Exception e) {
                 throw mRepository.toFetchException(e);
@@ -536,8 +550,12 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
             }
             try {
                 PreparedStatement ps = con.prepareStatement(prepareDelete(filterValues));
-                setParameters(ps, filterValues);
-                return ps.executeUpdate();
+                try {
+                    setParameters(ps, filterValues);
+                    return ps.executeUpdate();
+                } finally {
+                    ps.close();
+                }
             } catch (Exception e) {
                 throw mRepository.toPersistException(e);
             } finally {
-- 
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