add postgresql parser support

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

@@ -0,0 +1,83 @@
+package com.alibaba.druid.bvt.sql.postgresql;
+
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.List;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGOutputVisitor;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGSchemaStatVisitor;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class PostgresqlResourceTest extends TestCase {
+
+    public void test_0() throws Exception {
+        // 13
+        exec_test("bvt/parser/postgresql-0.txt");
+        // for (int i = 0; i <= 53; ++i) {
+        // exec_test("bvt/parser/oracle-" + i + ".txt");
+        // }
+    }
+
+    public void exec_test(String resource) throws Exception {
+        System.out.println(resource);
+        InputStream is = null;
+
+        is = Thread.currentThread().getContextClassLoader().getResourceAsStream(resource);
+        Reader reader = new InputStreamReader(is, "UTF-8");
+        String input = JdbcUtils.read(reader);
+        JdbcUtils.close(reader);
+        String[] items = input.split("---------------------------");
+        String sql = items[0].trim();
+        String expect = items[1].trim();
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement statemen = statementList.get(0);
+        System.out.println(output(statementList));
+
+        Assert.assertEquals(1, statementList.size());
+
+        PGSchemaStatVisitor visitor = new PGSchemaStatVisitor();
+        statemen.accept(visitor);
+
+        System.out.println(sql);
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getFields());
+
+        System.out.println();
+        System.out.println();
+    }
+
+    void mergValidate(String sql, String expect) {
+    	PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement statemen = statementList.get(0);
+
+        Assert.assertEquals(1, statementList.size());
+
+        StringBuilder out = new StringBuilder();
+        PGOutputVisitor visitor = new PGOutputVisitor(out);
+        statemen.accept(visitor);
+
+        System.out.println(out.toString());
+
+        Assert.assertEquals(expect, out.toString());
+    }
+
+    private String output(List<SQLStatement> stmtList) {
+        StringBuilder out = new StringBuilder();
+        PGOutputVisitor visitor = new PGOutputVisitor(out);
+
+        for (SQLStatement stmt : stmtList) {
+            stmt.accept(visitor);
+        }
+
+        return out.toString();
+    }
+}