Java数据库通用查询及封装

Java数据库通用查询及封装时常在网上看到，有关Java数据通用查询及封装的技术文章，前些日我在看书时突然想起以前怎么写jdbc查询的，好像当时没理顺，昨天晚上花了点时间，复习了一下写了两种通用数据封装。文章只是为了复习而写，新手可以看看吧,大牛飘过。。。。先把一些辅助类贴上来:DBHelp.java获得连接及关闭资源import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class DBHelp {static {try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException e) {e.printStackTrace();}}private String connStr = "jdbc:sqlserver://localhost:1433;DatabaseName=student";private String userName = "sa";private String userPass = "root";private Connection connection = null;public Connection getConnection() {try {connection = DriverManager.getConnection(connStr, userName,userPass);} catch (SQLException e) {e.printStackTrace();}return connection;}public void closeResource(Object obj) {try {if (Connection.class.isInstance(obj)) {((Connection) obj).close();}if (PreparedStatement.class.isInstance(obj)) {((PreparedStatement) obj).close();}if (ResultSet.class.isInstance(obj)) {((ResultSet) obj).close();}} catch (SQLException e) {e.printStackTrace();}}public void closeResource(Connection connection,PreparedStatement pStatement) {try {if (connection != null) {connection.close();}if (pStatement != null) {pStatement.close();}} catch (SQLException e) {e.printStackTrace();}}public void closeResource(Connection connection,PreparedStatement pStatement,ResultSet resultSet) {try {if (connection != null) {connection.close();}if (pStatement != null) {pStatement.close();}if(resultSet != null){resultSet.close();}} catch (SQLException e) {e.printStackTrace();}}}1. 不借助实体类作为载体,封装数据。Connections_DataProcesser.java处理sql语句import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class Connections_DataProcesser {private Connection connection = null;private PreparedStatement pStatement = null;private ResultSet resultSet = null;private static DBHelp db=new DBHelp();public List<List<Map<String, String>>> getObjectList(String sql,Object...obj){List<List<Map<String, String>>> list=new ArrayList<List<Map<String, String>>>();List<Map<String, String>> mList=null;Map<String, String> map=null;try {connection=db.getConnection();pStatement=connection.prepareStatement(sql);pStatement = formatSql(pStatement, obj);resultSet=pStatement.executeQuery();ResultSetMetaData rsmd=resultSet.getMetaData();String[] columnName=getColumnName(rsmd);while(resultSet.next()){mList=new ArrayList<Map<String,String>>();for(int i=0;i<rsmd.getColumnCount();i++){map=new HashMap<String, String>();map.put(columnName[i], resultSet.getString(i+1));mList.add(map);}list.add(mList);}} catch (SQLException e) {e.printStackTrace();}finally{db.closeResource(connection, pStatement, resultSet);}return list;}private String[] getColumnName(ResultSetMetaData rsmd){String[] columnName =null;try {columnName = new String[rsmd.getColumnCount()];for(int i=0;i<rsmd.getColumnCount();i++){columnName[i]=rsmd.getColumnName(i+1);}} catch (SQLException e) {e.printStackTrace();}return columnName;}private PreparedStatement formatSql(PreparedStatement pStatement ,Object...obj){try {if(obj.length !=0){for(int i=1;i<=obj.length;i++){pStatement.setObject(1, obj[i]);}}} catch (SQLException e) {e.printStackTrace();}return pStatement;}}一个示范查询，这种封装查询要求对java的集合类比较熟悉Test.javaimport java.util.Date;import java.util.List;import java.util.Map;import java.util.Set;import java.util.Map.Entry;public class Test {@SuppressWarnings("unchecked")public static void main(String[] args) {String sql="select * from students";Date d1=new Date();Connections_DataProcesser dp=new Connections_DataProcesser();List<List<Map<String, String>>> list=dp.getObjectList(sql);for(int i=0;i<list.size();i++){List<Map<String, String>> l=list.get(i);for(int k=0;k<l.size();k++){Set<Map.Entry<String, String>> mapset=l.get(k).entrySet()Map.Entry<String, String> m= (Entry<String, String>) mapset.toArray()[0];//System.out.print(m.getKey()+"="+m.getValue()+" ");System.out.print(m.getValue()+" ");}System.out.println();}Date d2=new Date();System.out.println(d2.getTime()-d1.getTime());}}2. 通用查询import java.lang.reflect.Field;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;public class CommonEntity_DataProcesser {private Connection connection = null;private PreparedStatement pStatement = null;private ResultSet resultSet = null;private static DBHelp db = new DBHelp();@SuppressWarnings("unchecked")public <T extends Object> List<T> getEntityList(T entity, String sql,Object... obj) {List<T> list = new ArrayList<T>();try {connection = db.getConnection();pStatement = connection.prepareStatement(sql);pStatement = formatSql(pStatement, obj);resultSet = pStatement.executeQuery();ResultSetMetaData rsmd = resultSet.getMetaData();String[] columnsName = getColumnName(rsmd);Class clazz = entity.getClass();Object entityObject = null;Field[] fields = clazz.getDeclaredFields();while (resultSet.next()) {entityObject = clazz.newInstance();for (int i = 0; i < columnsName.length; i++) {for (int k = 0; k < fields.length; k++) {if (fields[k].getName().equals(columnsName[i])) {fields[k].setAccessible(true);fields[k].set(entityObject, resultSet.getString(columnsName[i]));}}}list.add((T)entityObject);}} catch (SQLException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}finally{db.closeResource(connection, pStatement, resultSet);}return list;}private String[] getColumnName(ResultSetMetaData rsmd) {String[] columnName = null;try {columnName = new String[rsmd.getColumnCount()];for (int i = 0; i < rsmd.getColumnCount(); i++) {columnName[i] = rsmd.getColumnName(i + 1);}} catch (SQLException e) {e.printStackTrace();}return columnName;}private PreparedStatement formatSql(PreparedStatement pStatement,Object... obj) {try {if (obj.length != 0) {for (int i = 1; i <= obj.length; i++) {pStatement.setObject(1, obj[i]);}}} catch (SQLException e) {e.printStackTrace();}return pStatement;}}Test1.javaimport java.util.Date;import java.util.List;public class Test1 {public static void main(String[] args) {String sql="select * from students";Date d3 = new Date();CommonEntity_DataProcesser cedp = new CommonEntity_DataProcesser();List<Students> list1 = cedp.getEntityList(new Students(), sql);for (Students s : list1) {System.out.println(s.getId() + " " + s.getUserName() + " "+ s.getUserPass() + " " + s.getUserSex());}Date d4 = new Date();System.out.println(d4.getTime() - d3.getTime());}}实体类students.Javapublic class Students {private String id;private String userName;private String userPass;private String userSex;getter….setter…();…} 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