c# barcode reader library Output of the Test Program in Font

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Output of the Test Program
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Got results: list of column names ------------column name = ID column type = VARCHAR2 column name = SALARY column type = NUMBER column name = NAME column type = VARCHAR2 The name and type combination provides information about the table schema, but it is not enough. You need to get other useful information, such as the size of the column and whether the column is nullable. (Nullable means that the column accepts the NULL value; note that NULL in SQL is not a zero or an empty value but instead indicates that the value is missing.) So, you
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CHAPTER 2 DATABASE METADATA, PART 1
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can modify the program to provide more detailed information for each column. Since you are returning four distinct pieces of information for each column, you will return the result as an XML String object. For each column, the following information will be returned: <column name="NameOfColumn"> <type>TypeOfColumn</type> <size>SizeOfColumn</size> <nullable>true|false</nullable> </column>
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Testing getColumnDetails()
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// // print the detail of columns for table TestTable77 // String columnDetails = DatabaseMetaDataTool.getColumnDetails(conn, "TestTable77"); System.out.println("-------- columnDetails -------------"); System.out.println(columnDetails); System.out.println("------------------------------------");
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Output of Testing getColumnDetails()
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<columns> <column name="id"> <type>varchar</type> <size>10</size> <nullable>false</nullable> <position>1</position> </column> <column name="name"> <type>varchar</type> <size>20</size> <nullable>false</nullable> <position>2</position> </column> <column name="age"> <type>int</type> <size>11</size> <nullable>true</nullable> <position>3</position> </column> <column name="address"> <type>varchar</type> <size>100</size> <nullable>true</nullable> <position>4</position> </column> </columns>
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CHAPTER 2 DATABASE METADATA, PART 1
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getColumnDetails() Method
/** * Get column names and their associated attributes (type, * size, nullable, ordinal position). The result is returned * as XML (as a string object); if table name is null/empty * it returns null. * * @param conn the Connection object * @param tableName name of a table in the database. * @return XML (column names and their associated attributes: * type, size, nullable, ordinal position). * @exception Failed to get the column details for a given table. */ public static String getColumnDetails(java.sql.Connection conn, String tableName) throws Exception { ResultSet rsColumns = null; StringBuilder sb = new StringBuilder(); try { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } rsColumns = meta.getColumns(null, null, tableName.toUpperCase(), null); sb.append("<columns>"); while (rsColumns.next()) { String columnType = rsColumns.getString(COLUMN_NAME_TYPE_NAME); String columnName = rsColumns.getString(COLUMN_NAME_COLUMN_NAME); int size = rsColumns.getInt(COLUMN_NAME_COLUMN_SIZE); int nullable = rsColumns.getInt(COLUMN_NAME_NULLABLE); int position = rsColumns.getInt(COLUMN_NAME_ORDINAL_POSITION); sb.append("<column name=\""); sb.append(columnName); sb.append("\"><type>"); sb.append(columnType); sb.append("</type><size>"); sb.append(size); sb.append("</size><nullable>"); if (nullable == DatabaseMetaData.columnNullable) { sb.append("true"); }
CHAPTER 2 DATABASE METADATA, PART 1
else { sb.append("false"); } sb.append("</nullable><position>"); sb.append(position); sb.append("</position></column>"); } sb.append("</columns>"); return sb.toString(); } catch(Exception e) { throw new Exception("Error: could not get column names: "+e.toString()); } finally { DatabaseUtil.close(rsColumns); } }
getColumnDetails() Method: Selecting Type, Size, Nullable, Position
The following method selects the specific metadata that you are interested in by passing a boolean flag for each metadata: /** * Get column names and their associated attributes (type, * size, nullable). The result is returned as an XML (as * a string object); if table name is null/empty * it returns null. * * @param conn the Connection object * @param tableName name of a table in the database. * @param includeType if true, then include type information. * @param includeSize if true, then include size information. * @param includeNullable if true, then include nullable information. * @param includePosition if true, then include ordinal position information. * @return an XML: column names and their associated attributes: type, * size, nullable. * @exception Failed to get the column details for a given table. */ public static String getColumnDetails(java.sql.Connection conn, String tableName, boolean includeType, boolean includeSize, boolean includeNullable, boolean includePosition)
CHAPTER 2 DATABASE METADATA, PART 1
throws Exception { ResultSet rsColumns = null; StringBuffer sb = new StringBuffer(); try { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } rsColumns = meta.getColumns(null, null, tableName.toUpperCase(), null); sb.append("<columns>"); while (rsColumns.next()) { String columnName = rsColumns.getString(COLUMN_NAME_COLUMN_NAME); sb.append("<column name=\""); sb.append(columnName); sb.append("\">"); if (includeType) { String columnType = rsColumns.getString(COLUMN_NAME_TYPE_NAME); sb.append("<type>"); sb.append(columnType); sb.append("</type>"); } if (includeSize) { int size = rsColumns.getInt(COLUMN_NAME_COLUMN_SIZE); sb.append("<size>"); sb.append(size); sb.append("</size>"); } if (includeNullable) { int nullable = rsColumns.getInt(COLUMN_NAME_NULLABLE); sb.append("<nullable>"); if (nullable == DatabaseMetaData.columnNullable) { sb.append("true"); } else { sb.append("false"); } sb.append("</nullable>"); }
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