Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/jdbc/JDBCUtils.java

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+package cn.aofeng.demo.jdbc;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * JDBC常用方法集。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class JDBCUtils {
+
+    private static Logger _logger = LoggerFactory.getLogger(JDBCUtils.class);
+    
+    public static void close(ResultSet rs) {
+        if (null != rs) {
+            try {
+                rs.close();
+            } catch (SQLException e) {
+                _logger.error("close resultset occurs error", e);
+            }
+        }
+    }
+    
+    public static void close(Statement stmt) {
+        if (null != stmt) {
+            try {
+                stmt.close();
+            } catch (SQLException e) {
+                _logger.error("close statement occurs error", e);
+            }
+        }
+    }
+    
+    public static void close(Connection conn) {
+        if (null != conn) {
+            try {
+                conn.close();
+            } catch (SQLException e) {
+                _logger.error("close connection occurs error", e);
+            }
+        }
+    }
+
+    public static void showResultSetInfo(ResultSet rs) throws SQLException {
+        ResultSetMetaData rsMeta = rs.getMetaData();
+        int colCount = rsMeta.getColumnCount();
+        _logger.info("total columns:{}", colCount);
+        for (int i = 1; i <= colCount; i++) {
+            _logger.info("column name:{}, label:{}, type:{}, typeName:{}",
+                    rsMeta.getColumnName(i), 
+                    rsMeta.getColumnLabel(i),
+                    rsMeta.getColumnType(i),
+                    rsMeta.getColumnTypeName(i));
+        }
+    }
+
+}

Java/JavaDemo/codedemo/jdbc/MetaDataExample.java

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+package cn.aofeng.demo.jdbc;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Properties;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import cn.aofeng.demo.tree.PrettyTree;
+import cn.aofeng.demo.tree.PrettyTree.Node;
+
+/**
+ * JDBC元数据使用示例。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class MetaDataExample {
+
+    private static Logger _logger = LoggerFactory.getLogger(MetaDataExample.class);
+
+    /**
+     * @param args
+     */
+    public static void main(String[] args) {
+        String url = "jdbc:mysql://192.168.56.102:19816/ucgc_sdk?useUnicode=true&characterEncoding=UTF8";
+        Properties info = new Properties();
+        info.put("user", "uzone");
+        info.put("password", "uzone");
+
+        Connection conn = null;
+        try {
+            conn = DriverManager.getConnection(url, info);
+            DatabaseMetaData dbMeta = conn.getMetaData();
+            showCatalogs(dbMeta);
+        } catch (SQLException e) {
+            _logger.error("get connection occurs error", e);
+        } finally {
+            JDBCUtils.close(conn);
+        }
+    }
+
+    private static void showCatalogs(DatabaseMetaData dbMeta) throws SQLException {
+        ResultSet catalogsRs = null;
+        try {
+            catalogsRs = dbMeta.getCatalogs();
+//             JDBCUtils.showResultSetInfo(catalogsRs);
+            while (catalogsRs.next()) {
+                String catalog = catalogsRs.getString("TABLE_CAT");
+                showTables(dbMeta, catalog);
+            }
+        } finally {
+            JDBCUtils.close(catalogsRs);
+        }
+    }
+
+    /**
+     * 采用树状结构输出Catalog和所有归属于它的表的名称。
+     */
+    private static void showTables(DatabaseMetaData dbMeta, String catalog) throws SQLException {
+        ResultSet tablesRs = null;
+        Node root = new Node(catalog);
+        try {
+            tablesRs = dbMeta.getTables(catalog, null, null, null);
+//             JDBCUtils.showResultSetInfo(tablesRs);
+            while (tablesRs.next()) {
+                root.add(new Node(tablesRs.getString("TABLE_NAME")));
+            }
+        } finally {
+            JDBCUtils.close(tablesRs);
+        }
+        
+        StringBuilder buffer = new StringBuilder(256);
+        PrettyTree pt = new PrettyTree();
+        pt.renderRoot(root, buffer);
+        System.out.print(buffer);
+    }
+
+}