mysql數據庫模式信息提取

此程序實現將mysql數據庫的模式信息展示出來。下面我簡要地說明一下。

1.樹形結構的實現。

 SimplePanel pl=new SimplePanel(); private void buildFrameLayout(){ try{ pane = getContentPane(); //關閉面板 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //BorderLayout佈局管理器 JPanel panel = new JPanel(); final JScrollPane scrollPane = new JScrollPane(); //panel.setBounds(24, 10, 173, 317); panel.add(scrollPane); //初始化根節點 DefaultMutableTreeNode root=new DefaultMutableTreeNode(connection.getCatalog()); //獲得表名 Vector<Object> vector = getTableNames(); DefaultMutableTreeNode menu_accp = null; for(int i = 0; i < vector.size(); i++){ String strName = (String)vector.get(i); //初始化枝節點 menu_accp = new DefaultMutableTreeNode(strName); Vector<Object> vectorColumn = getColumnNames(strName); DefaultMutableTreeNode menu_accp_son = null; //添加枝節點數據 root.add(menu_accp); for(int j = 0; j < vectorColumn.size(); j++){ //初始化葉子節點 menu_accp_son = new DefaultMutableTreeNode((String)vectorColumn.get(j)); //添加葉子節點數據 menu_accp.add(menu_accp_son); } } tree = new JTree(root); TreeSelectionModel model = tree.getSelectionModel(); //一次只能選擇一個樹節點 model.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); //顯示樹 scrollPane.setViewportView(tree); pane.add(panel,BorderLayout.WEST); //註冊點擊節點事件 tree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent e) { DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree .getLastSelectedPathComponent(); // 可選用戶對象 Object nodeInfo = node.getUserObject(); if (node.getLevel()==0) { //根節點不處理 } else if (node.getLevel()==1){ //枝節點 pl.getPanel(connection, nodeInfo.toString(),node.getParent().toString(),node.getLevel()); } else { //葉子節點 pl.getPanel(connection, nodeInfo.toString(),node.getParent().toString(),node.getLevel()); } } }); pane.add(pl,BorderLayout.CENTER); }catch(Exception e){e.printStackTrace();} }

2.信息展示的實現。

public ColumnModel(Connection connection, String selectTable) throws SQLException { Statement stmt = connection.createStatement(); // 執行數據查找 ResultSet rset = stmt.executeQuery("SELECT * FROM " + selectTable); // 結果集元數據 ResultSetMetaData rsmd = rset.getMetaData(); // 列長 int count = rsmd.getColumnCount(); String[] tableHeads = { "屬性ID", "屬性名" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } tableData = new Vector<Object>(count); for (int i = 1; i <= count; i++) { Vector<Object> rowData = new Vector<Object>(count); rowData.add(i); rowData.add(rsmd.getColumnName(i)); tableData.addElement(rowData); } } public ColumnModel(Connection connection, String selectNode, String parentNode) throws SQLException { Statement stmt = connection.createStatement(); // 執行數據查找 ResultSet rset = stmt.executeQuery("SELECT * FROM " + parentNode); // 結果集元數據 ResultSetMetaData rsmd = rset.getMetaData(); // 列長 int count = rsmd.getColumnCount(); String[] tableHeads = { "屬性ID", "數據類型", "(最大)長度", "小數位" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } tableData = new Vector<Object>(count); int strInt = 0; for (int i = 1; i <= count; i++) { if (rsmd.getColumnName(i).equals(selectNode)) { strInt = i; break; } } Vector<Object> rowData = new Vector<Object>(count); rowData.add(strInt); rowData.add(rsmd.getColumnTypeName(strInt)); rowData.add(rsmd.getColumnDisplaySize(strInt)); rowData.add(rsmd.getPrecision(strInt)); tableData.addElement(rowData); } //======================================================= public RowModel(Connection connection, String selectTable) throws SQLException { // 執行數據查找 DatabaseMetaData dbMetaData = connection.getMetaData(); // 結果集元數據 // ResultSetMetaData rsmd = rset.getMetaData(); // 獲取表的主外鍵的描述 ResultSet tablePrimaryKeyInfo = dbMetaData.getPrimaryKeys(null, null, selectTable); // 列長 int count = 3; String[] tableHeads = { "鍵名", "鍵屬性(組)", "鍵類型" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } String strTest = "("; String strTest1 = ""; while (tablePrimaryKeyInfo.next()) { strTest += tablePrimaryKeyInfo.getString("COLUMN_NAME") + " "; strTest1 = tablePrimaryKeyInfo.getString("PK_NAME"); } strTest = strTest.trim().replace(' ', ',') + ")"; tableData = new Vector<Object>(count); Vector<Object> rowData = new Vector<Object>(count); rowData.add("PK_INTER"); rowData.add(strTest); rowData.add(strTest1); tableData.addElement(rowData); } public RowModel(Connection connection, String selectNode, String parentNode) throws SQLException { Statement stmt = connection.createStatement(); // 執行數據查找 ResultSet rset = stmt.executeQuery("SELECT * FROM " + parentNode); // 結果集元數據 ResultSetMetaData rsmd = rset.getMetaData(); DatabaseMetaData dbMetaData = connection.getMetaData(); ResultSet columnInfo = dbMetaData.getColumns(null, null, parentNode, selectNode); // 列長 int count = rsmd.getColumnCount(); String[] tableHeads = { "屬性ID", "DEFAULT", "NOT NULL" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } tableData = new Vector<Object>(count); int strInt = 0; for (int i = 1; i <= count; i++) { if (rsmd.getColumnName(i).equals(selectNode)) { strInt = i; break; } } while (columnInfo.next()) { Vector<Object> rowData = new Vector<Object>(count); rowData.add(strInt); rowData.add(columnInfo.getString("COLUMN_DEF")); rowData.add(columnInfo.getString("IS_NULLABLE")); tableData.addElement(rowData); } } //======================================================= public ComponentModel(Connection connection, String selectTable) throws SQLException { // 執行數據查找 DatabaseMetaData dbMetaData = connection.getMetaData(); ResultSet tableForeignKeyInfo = dbMetaData.getImportedKeys(null, null, selectTable); String[] tableHeads = { "外鍵", "外鍵屬性", "引用的關係", "引用的屬性", "更新規則", "刪除規則" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } // 列長 int count = columnHeaders.size(); tableData = new Vector<Object>(count); while (tableForeignKeyInfo.next()) { Vector<Object> rowData = new Vector<Object>(count); rowData.add("FK_ENTER"); rowData.add(tableForeignKeyInfo.getString("FKCOLUMN_NAME")); rowData.add(tableForeignKeyInfo.getString("PKTABLE_NAME")); rowData.add(tableForeignKeyInfo.getString("PKCOLUMN_NAME")); short sht = Short.parseShort(tableForeignKeyInfo .getString("UPDATE_RULE")); String strTest = ""; switch (sht) { // 如果已經被導入，則不允許更新主鍵 case 3: strTest = "importedNoAction"; break; // 將導入的鍵更改爲與主鍵更新一致 case 0: strTest = "importedKeyCascade"; break; // 如果已更新導入鍵的主鍵，則將導入鍵更改爲 NULL case 2: strTest = "importedKeySetNull"; break; // 如果已更新導入鍵的主鍵，則將導入鍵更改爲默認值 case 4: strTest = "importedKeySetDefault"; break; // 與 importedKeyNoAction 相同（爲了與 ODBC 2.x 兼容） case 1: strTest = "importedKeyRestrict"; break; default: break; } rowData.add(strTest); short sht1 = Short.parseShort(tableForeignKeyInfo .getString("DELETE_RULE")); String strTest1 = ""; switch (sht1) { case 3: strTest1 = "importedKeyNoAction"; break; case 0: strTest1 = "importedKeyCascade"; break; case 2: strTest1 = "importedKeySetNull"; break; case 4: strTest1 = "importedKeyRestrict"; break; case 1: strTest1 = "importedKeySetDefault"; break; default: break; } rowData.add(strTest1); tableData.addElement(rowData); } } public ComponentModel(Connection connection, String selectNode, String parentNode) throws SQLException { Statement stmt = connection.createStatement(); // 執行數據查找 ResultSet rset = stmt.executeQuery("SELECT * FROM " + parentNode); // 結果集元數據 ResultSetMetaData rsmd = rset.getMetaData(); // 列長 int count = rsmd.getColumnCount(); String[] tableHeads = { "屬性ID", "是否只讀", "是否只寫" }; // 將表格頭轉換過向量類型,以備表格模型使用 columnHeaders = new Vector<Object>(); for (int i = 0; i < tableHeads.length; i++) { columnHeaders.add(tableHeads[i]); } tableData = new Vector<Object>(count); int strInt = 0; for (int i = 1; i <= count; i++) { if (rsmd.getColumnName(i).equals(selectNode)) { strInt = i; break; } } Vector<Object> rowData = new Vector<Object>(count); rowData.add(strInt); rowData.add(rsmd.isReadOnly(strInt)); rowData.add(rsmd.isWritable(strInt)); tableData.addElement(rowData); }

最終的實現效果如下：