support sharePreparedStatements option

src/test/java/com/alibaba/druid/bvt/pool/TestSharePreparedStatements.java

@@ -0,0 +1,91 @@
+package com.alibaba.druid.bvt.pool;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.mock.MockPreparedStatement;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.stat.DruidDataSourceStatManager;
+
+public class TestSharePreparedStatements extends TestCase {
+
+    protected void setUp() throws Exception {
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+    }
+
+    protected void tearDown() throws Exception {
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+    }
+
+    public void test_sharePreparedStatements() throws Exception {
+
+        // sharePreparedStatements
+
+        DruidDataSource dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setMaxPoolPreparedStatementPerConnectionSize(30);
+
+        String sql = "SELECT 1";
+
+        MockPreparedStatement mockStmt = null;
+        {
+            Connection conn = dataSource.getConnection();
+
+            PreparedStatement stmt = conn.prepareStatement(sql);
+            mockStmt = stmt.unwrap(MockPreparedStatement.class);
+            ResultSet rs = stmt.executeQuery();
+            rs.next();
+            rs.close();
+            stmt.close();
+
+            conn.close();
+        }
+        
+        {
+            Connection conn = dataSource.getConnection();
+
+            PreparedStatement stmt = conn.prepareStatement(sql);
+            Assert.assertEquals(mockStmt, stmt.unwrap(MockPreparedStatement.class));
+            ResultSet rs = stmt.executeQuery();
+            rs.next();
+            rs.close();
+            stmt.close();
+
+            conn.close();
+        }
+
+        {
+            Connection conn = dataSource.getConnection();
+            conn.setAutoCommit(false);
+
+            PreparedStatement stmt = conn.prepareStatement(sql);
+            Assert.assertEquals(true, mockStmt != stmt.unwrap(MockPreparedStatement.class));
+            ResultSet rs = stmt.executeQuery();
+            rs.next();
+            rs.close();
+            stmt.close();
+
+            conn.close();
+        }
+        
+        {
+            Connection conn = dataSource.getConnection();
+            conn.setAutoCommit(false);
+            
+            PreparedStatement stmt = conn.prepareStatement(sql);
+            Assert.assertEquals(true, mockStmt != stmt.unwrap(MockPreparedStatement.class));
+            ResultSet rs = stmt.executeQuery();
+            rs.next();
+            rs.close();
+            stmt.close();
+            
+            conn.close();
+        }
+
+        dataSource.close();
+    }
+}