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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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buffer.append("</TD><TD>"); buffer.append(primaryKeys.getString("TABLE_NAME")); buffer.append("</TD><TD>"); buffer.append(primaryKeys.getString("COLUMN_NAME")); buffer.append("</TD><TD>"); buffer.append(primaryKeys.getShort("KEY_SEQ")); buffer.append("</TD><TD>"); buffer.append(primaryKeys.getString("PK_NAME")); buffer.append("</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); } private static void printXML(HttpServletResponse response, ResultSet primaryKeys) throws Exception { response.setContentType("text/xml"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("< xml version=\"1.0\" encoding=\"ISO-8859-1\" >"); buffer.append("<primaryKeys>"); while (primaryKeys.next()) { buffer.append("<pkColumn><catalog>"); buffer.append(primaryKeys.getString("TABLE_CAT")); buffer.append("</catalog><schema>"); buffer.append(primaryKeys.getString("TABLE_SCHEM")); buffer.append("</schema><tableName>"); buffer.append(primaryKeys.getString("TABLE_NAME")); buffer.append("</tableName><columnName>"); buffer.append(primaryKeys.getString("COLUMN_NAME")); buffer.append("</columnName><keySEQ>"); buffer.append(primaryKeys.getShort("KEY_SEQ")); buffer.append("</keySEQ><pkName>"); buffer.append(primaryKeys.getString("PK_NAME")); buffer.append("</pkName></pkColumn>"); } buffer.append("</primaryKeys>"); out.println(buffer.toString()); } private static void printError(HttpServletResponse response, String message) { try { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer();
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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buffer.append("<html><body>"); buffer.append(message); buffer.append("</body></html>"); out.println(buffer); } catch(Exception ignore) { } }
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/** * Retrieves a description of the given table's primary key columns. * @param conn the Connection object * @param tableName name of a table in the database. * @return the list of PK columns as a ResultSet object * @exception Failed to get the Primary Keys for a given table. */ public static ResultSet getPrimaryKeys(Connection conn, String tableName) throws Exception { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } // // The Oracle database stores its table names as // uppercase; if you pass a table name in lowercase // characters, it will not work. MySQL database does // not care if the table name is uppercase/lowercase. // return meta.getPrimaryKeys(null, null, tableName.toUpperCase()); } }
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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Invoking GetPKColumns for MySQL
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Figure 8-19 shows how to run the solution for the MySQL database.
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Figure 8-19. Invoking GetPKColumns for MySQL (XML output)
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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Invoking GetPKColumns for Oracle
Figure 8-20 shows how to run the solution for the Oracle database.
Figure 8-20. Invoking GetPKColumns for Oracle (XML output)
8.15. How Do You Get a Table s Columns
A relational table has a finite set of columns (column names must be unique and each might have a different data type). In GUI database applications, in order to manipulate a relational table, you need to understand column names and types. Also, for a web-based application, you need to know the primary key (PK) columns before inserting new records (to make sure that the PK columns cannot be NULL). The DatabaseMetaData.getColumns() method retrieves a description of table columns available in the specified catalog. The method s signature is ResultSet getColumns(String String String String throws catalog, schemaPattern, tableNamePattern, columnNamePattern) SQLException
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
Only column descriptions matching the catalog, schema, table, and column name criteria are returned. They are ordered by TABLE_SCHEM, TABLE_NAME, and ORDINAL_POSITION. Each column description has the columns shown in Table 8-2. Table 8-2. Column Descriptions
Column Name
TABLE_CAT TABLE_SCHEM TABLE_NAME COLUMN_NAME DATA_TYPE TYPE_NAME COLUMN_SIZE
Column Type
String String String String int String int
Description
Table catalog (may be null). Table schema (may be null). Table name. Column name. SQL type from java.sql.Types. Data source dependent type name; for a UDT, the type name is fully qualified. Column size. For char or date types, this is the maximum number of characters; for numeric or decimal types, this is precision. Is not used. The number of fractional digits. Radix (typically either 10 or 2). Specifies whether NULL is allowed: columnNoNulls: Might not allow NULL values. columnNullable: Definitely allows NULL values. columnNullableUnknown: Nullability unknown. Comment describing the column (may be null). The default value (may be null). Unused. Unused. For char types, the maximum number of bytes in the column. The index of columns in the table (starting at 1). NO means the column definitely does not allow NULL values; YES means the column might allow NULL values. An empty string means nullability is unknown. A catalog of the table that is the scope of a reference attribute (null if DATA_TYPE isn t REF). A schema of the table that is the scope of a reference attribute (null if the DATA_TYPE isn t REF). The name of the table that is the scope of a reference attribute (null if the DATA_TYPE isn t REF). The source type of a distinct type or user-generated Ref or SQL type from java.sql.Types (null if DATA_TYPE isn t DISTINCT or user-generated REF).
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