{"id":20182,"date":"2022-11-08T23:42:42","date_gmt":"2022-11-08T18:12:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-java-sql-connections-via-class\/"},"modified":"2022-11-08T23:42:42","modified_gmt":"2022-11-08T18:12:42","slug":"solved-java-sql-connections-via-class","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-java-sql-connections-via-class\/","title":{"rendered":"[Solved] java sql connections via class"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-10617251\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"10617251\" data-parentid=\"10617128\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>This is pretty awful code &#8211; useless as written.  You&#8217;ve got a lot of work to do.<\/p>\n<p>I&#8217;d recommend that you study this and throw your code away:<\/p>\n<pre><code>package persistence;\n\nimport java.sql.*;\nimport java.util.*;\n\n\/**\n * util.DatabaseUtils\n * User: Michael\n * Date: Aug 17, 2010\n * Time: 7:58:02 PM\n *\/\npublic class DatabaseUtils {\n    private static final String DEFAULT_DRIVER = \"oracle.jdbc.driver.OracleDriver\";\n    private static final String DEFAULT_URL = \"jdbc:oracle:thin:@host:1521:database\";\n    private static final String DEFAULT_USERNAME = \"username\";\n    private static final String DEFAULT_PASSWORD = \"password\";\n\/*\n    private static final String DEFAULT_DRIVER = \"org.postgresql.Driver\";\n    private static final String DEFAULT_URL = \"jdbc:postgresql:\/\/localhost:5432\/party\";\n    private static final String DEFAULT_USERNAME = \"pgsuper\";\n    private static final String DEFAULT_PASSWORD = \"pgsuper\";\n*\/\n\/*\n    private static final String DEFAULT_DRIVER = \"com.mysql.jdbc.Driver\";\n    private static final String DEFAULT_URL = \"jdbc:mysql:\/\/localhost:3306\/party\";\n    private static final String DEFAULT_USERNAME = \"party\";\n    private static final String DEFAULT_PASSWORD = \"party\";\n*\/\n\n    public static void main(String[] args) {\n        long begTime = System.currentTimeMillis();\n\n        String driver = ((args.length &gt; 0) ? args[0] : DEFAULT_DRIVER);\n        String url = ((args.length &gt; 1) ? args[1] : DEFAULT_URL);\n        String username = ((args.length &gt; 2) ? args[2] : DEFAULT_USERNAME);\n        String password = ((args.length &gt; 3) ? args[3] : DEFAULT_PASSWORD);\n\n        Connection connection = null;\n\n        try {\n            connection = createConnection(driver, url, username, password);\n            DatabaseMetaData meta = connection.getMetaData();\n            System.out.println(meta.getDatabaseProductName());\n            System.out.println(meta.getDatabaseProductVersion());\n\n            String sqlQuery = \"SELECT PERSON_ID, FIRST_NAME, LAST_NAME FROM PERSON ORDER BY LAST_NAME\";\n            System.out.println(\"before insert: \" + query(connection, sqlQuery, Collections.EMPTY_LIST));\n\n            connection.setAutoCommit(false);\n            String sqlUpdate = \"INSERT INTO PERSON(FIRST_NAME, LAST_NAME) VALUES(?,?)\";\n            List parameters = Arrays.asList(\"Foo\", \"Bar\");\n            int numRowsUpdated = update(connection, sqlUpdate, parameters);\n            connection.commit();\n\n            System.out.println(\"# rows inserted: \" + numRowsUpdated);\n            System.out.println(\"after insert: \" + query(connection, sqlQuery, Collections.EMPTY_LIST));\n        } catch (Exception e) {\n            rollback(connection);\n            e.printStackTrace();\n        } finally {\n            close(connection);\n            long endTime = System.currentTimeMillis();\n            System.out.println(\"wall time: \" + (endTime - begTime) + \" ms\");\n        }\n    }\n\n    public static Connection createConnection(String driver, String url, String username, String password) throws ClassNotFoundException, SQLException {\n        Class.forName(driver);\n        if ((username == null) || (password == null) || (username.trim().length() == 0) || (password.trim().length() == 0)) {\n            return DriverManager.getConnection(url);\n        } else {\n            return DriverManager.getConnection(url, username, password);\n        }\n    }\n\n    public static void close(Connection connection) {\n        try {\n            if (connection != null) {\n                connection.close();\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n\n    public static void close(Statement st) {\n        try {\n            if (st != null) {\n                st.close();\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static void close(ResultSet rs) {\n        try {\n            if (rs != null) {\n                rs.close();\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static void rollback(Connection connection) {\n        try {\n            if (connection != null) {\n                connection.rollback();\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static List&lt;Map&lt;String, Object&gt;&gt; map(ResultSet rs) throws SQLException {\n        List&lt;Map&lt;String, Object&gt;&gt; results = new ArrayList&lt;Map&lt;String, Object&gt;&gt;();\n        try {\n            if (rs != null) {\n                ResultSetMetaData meta = rs.getMetaData();\n                int numColumns = meta.getColumnCount();\n                while (rs.next()) {\n                    Map&lt;String, Object&gt; row = new HashMap&lt;String, Object&gt;();\n                    for (int i = 1; i &lt;= numColumns; ++i) {\n                        String name = meta.getColumnName(i);\n                        Object value = rs.getObject(i);\n                        row.put(name, value);\n                    }\n                    results.add(row);\n                }\n            }\n        } finally {\n            close(rs);\n        }\n        return results;\n    }\n\n    public static List&lt;Map&lt;String, Object&gt;&gt; query(Connection connection, String sql, List&lt;Object&gt; parameters) throws SQLException {\n        List&lt;Map&lt;String, Object&gt;&gt; results = null;\n        PreparedStatement ps = null;\n        ResultSet rs = null;\n        try {\n            ps = connection.prepareStatement(sql);\n\n            int i = 0;\n            for (Object parameter : parameters) {\n                ps.setObject(++i, parameter);\n            }\n            rs = ps.executeQuery();\n            results = map(rs);\n        } finally {\n            close(rs);\n            close(ps);\n        }\n        return results;\n    }\n\n    public static int update(Connection connection, String sql, List&lt;Object&gt; parameters) throws SQLException {\n        int numRowsUpdated = 0;\n        PreparedStatement ps = null;\n        try {\n            ps = connection.prepareStatement(sql);\n\n            int i = 0;\n            for (Object parameter : parameters) {\n                ps.setObject(++i, parameter);\n            }\n            numRowsUpdated = ps.executeUpdate();\n        } finally {\n            close(ps);\n        }\n        return numRowsUpdated;\n    }\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">8<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved java sql connections via class  <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This is pretty awful code &#8211; useless as written. You&#8217;ve got a lot of work to do. I&#8217;d recommend that you study this and throw your code away: package persistence; import java.sql.*; import java.util.*; \/** * util.DatabaseUtils * User: Michael * Date: Aug 17, 2010 * Time: 7:58:02 PM *\/ public class DatabaseUtils { &#8230; <a title=\"[Solved] java sql connections via class\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-java-sql-connections-via-class\/\" aria-label=\"More on [Solved] java sql connections via class\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2501,323],"class_list":["post-20182","post","type-post","status-publish","format-standard","hentry","category-solved","tag-instance-variables","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] java sql connections via class - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-java-sql-connections-via-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] java sql connections via class - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This is pretty awful code &#8211; useless as written. You&#8217;ve got a lot of work to do. I&#8217;d recommend that you study this and throw your code away: package persistence; import java.sql.*; import java.util.*; \/** * util.DatabaseUtils * User: Michael * Date: Aug 17, 2010 * Time: 7:58:02 PM *\/ public class DatabaseUtils { ... 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