add testcase & remove unused code

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGExportParameterVisitorTest.java

@@ -0,0 +1,29 @@
+package com.alibaba.druid.bvt.sql.postgresql;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGExportParameterVisitor;
+
+
+public class PGExportParameterVisitorTest extends TestCase {
+    public void test_pg() throws Exception {
+        String sql = "select fname, count(*) from t where fid = 1 group by fname order by 1";
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+
+        List<Object> parameters = new ArrayList<Object>();
+        PGExportParameterVisitor visitor = new PGExportParameterVisitor(parameters);
+        stmt.accept(visitor);
+        
+        Assert.assertEquals(1, parameters.size());
+        Assert.assertEquals(1, parameters.get(0));
+    }
+}

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGExportParameterVisitorTest1.java

@@ -0,0 +1,29 @@
+package com.alibaba.druid.bvt.sql.postgresql;
+
+import java.util.List;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGExportParameterVisitor;
+
+
+public class PGExportParameterVisitorTest1 extends TestCase {
+    public void test_pg() throws Exception {
+        String sql = "select fname, count(*) from t where fid = 1 group by fname order by 1";
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+
+        PGExportParameterVisitor visitor = new PGExportParameterVisitor();
+        stmt.accept(visitor);
+        
+        List<Object> parameters = visitor.getParameters();
+        
+        Assert.assertEquals(1, parameters.size());
+        Assert.assertEquals(1, parameters.get(0));
+    }
+}