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BUFFER_LENGTH DECIMAL_DIGITS NUM_PREC_RADIX NULLABLE int int int
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REMARKS COLUMN_DEF SQL_DATA_TYPE SQL_DATETIME_SUB CHAR_OCTET_LENGTH ORDINAL_POSITION IS_NULLABLE
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String String int int int int String
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SCOPE_CATLOG SCOPE_SCHEMA SCOPE_TABLE SOURCE_DATA_TYPE
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String String String short
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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The parameters are catalog: A catalog name; it must match the catalog name as it is stored in the database. "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search. schemaPattern: A schema name pattern; it must match the schema name as it is stored in the database. "" retrieves those without a schema; null means that the schema name should not be used to narrow the search. tableNamePattern: A table name pattern; it must match the table name as it is stored in the database. columnNamePattern: A column name pattern; it must match the column name as it is stored in the database. As you can see, this method returns its result as a ResultSet object (each row is a detailed column description), which is not very useful for web-based applications. Next I present a Java servlet (GetColumns), which will be able to get a table s columns (as well as other related metadata information) as HTML or XML. Here is the signature of the servlet: GetColumns vendor=<vendor-name>&table=<table-name>&format=<HTML-or-XML> You may add other parameters to suit your database application. Here, I use vendor to act as a database selector. So, to get the employee table s columns information as XML for a MySQL database, you may invoke it as GetColumns vendor=mysql&table=employees&format=xml The other possibilities are GetColumns vendor=mysql&table=employees&format=html GetColumns vendor=oracle&table=employees&format=xml GetColumns vendor=oracle&table=employees&format=html
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MySQL Database Setup
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mysql> use octopus; Database changed mysql> create table mytable ( id varchar(10) not null, name varchar(20) not null, age integer, primary key (id, name) ); Query OK, 0 rows affected (0.08 sec)
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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mysql> desc mytable; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(10) | NO | PRI | | | | name | varchar(20) | NO | PRI | | | | age | int(11) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.03 sec)
Oracle Database Setup
SQL> create table mytable( id varchar2(10) not null, name varchar(20) not null, age number, primary key (id, name) ); Table created. SQL> desc mytable; Name ----------------------------------------ID NAME AGE
Null -------NOT NULL NOT NULL
Type -----------VARCHAR2(10) VARCHAR2(20) NUMBER
The Solution
import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.io.PrintWriter; import java.io.IOException; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class GetColumns extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ResultSet columns = null; Connection conn = null;
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
try { String dbVendor = request.getParameter("vendor").trim(); String table = request.getParameter("table").trim(); String outputFormat = request.getParameter("format").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); columns = getColumns(conn, table); if (outputFormat.equals("xml")) { printXML(response, columns); } else { printHTML(response, columns); } } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(columns); DatabaseUtil.close(conn); } } // end doGet private static void printHTML(HttpServletResponse response, ResultSet columns) throws Exception { response.setContentType("text/html"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("<html><body><table border=1 cellspacing=0 cellpadding=0>"); buffer.append("<TR><TH>Catalog</TH>"); buffer.append("<TH>Schema</TH>"); buffer.append("<TH>Table Name</TH>"); buffer.append("<TH>Column Name</TH>"); buffer.append("<TH>Data Type</TH>"); buffer.append("<TH>Type Name</TH>"); buffer.append("<TH>Column Size</TH>"); buffer.append("<TH>Is Nullable </TH>"); buffer.append("<TH>Is Nullable </TH>"); buffer.append("<TH>Ordinal Position</TH></TR>"); while (columns.next()) { buffer.append("<TR><TD>"); buffer.append(columns.getString("TABLE_CAT")); buffer.append("</TD><TD>"); buffer.append(columns.getString("TABLE_SCHEM")); buffer.append("</TD><TD>"); buffer.append(columns.getString("TABLE_NAME"));
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
buffer.append("</TD><TD>"); buffer.append(columns.getString("COLUMN_NAME")); buffer.append("</TD><TD>"); buffer.append(columns.getShort("DATA_TYPE")); buffer.append("</TD><TD>"); buffer.append(columns.getString("TYPE_NAME")); buffer.append("</TD><TD>"); buffer.append(columns.getString("COLUMN_SIZE")); buffer.append("</TD><TD>"); int nullable = columns.getInt("NULLABLE"); if (nullable == DatabaseMetaData.columnNullable) { buffer.append("true"); } else if (nullable == DatabaseMetaData.columnNoNulls) { buffer.append("false"); } else { buffer.append("unknown"); } buffer.append("</TD><TD>"); buffer.append(columns.getString("IS_NULLABLE")); buffer.append("</TD><TD>"); buffer.append(columns.getString("ORDINAL_POSITION")); buffer.append("</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); } private static void printXML(HttpServletResponse response, ResultSet columns) throws Exception { response.setContentType("text/xml"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("< xml version=\"1.0\" >"); buffer.append("<columns>"); while (columns.next()) { buffer.append("<column><catalog>"); buffer.append(columns.getString("TABLE_CAT")); buffer.append("</catalog><schema>"); buffer.append(columns.getString("TABLE_SCHEM")); buffer.append("</schema><tableName>"); buffer.append(columns.getString("TABLE_NAME")); buffer.append("</tableName><columnName>"); buffer.append(columns.getString("COLUMN_NAME"));
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
buffer.append("</columnName><dataType>"); buffer.append(columns.getShort("DATA_TYPE")); buffer.append("</dataType><typeName>"); buffer.append(columns.getString("TYPE_NAME")); buffer.append("</typeName><columnSize>"); buffer.append(columns.getString("COLUMN_SIZE")); buffer.append("</columnSize><nullable>"); int nullable = columns.getInt("NULLABLE"); if (nullable == DatabaseMetaData.columnNullable) { buffer.append("true"); } else if (nullable == DatabaseMetaData.columnNoNulls) { buffer.append("false"); } else { buffer.append("unknown"); } buffer.append("</nullable><isNullable>"); buffer.append(columns.getString("IS_NULLABLE")); buffer.append("</isNullable><ordinalPosition>"); buffer.append(columns.getString("ORDINAL_POSITION")); buffer.append("</ordinalPosition></column>"); } buffer.append("</columns>"); out.println(buffer.toString()); } private static void printError(HttpServletResponse response, String message) { try { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer(); buffer.append("<html><body>"); buffer.append(message); buffer.append("</body></html>"); out.println(buffer); } catch(Exception ignore) { } }
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