J2ee开发用到的数据库操作类大全

J2ee项目开发过程中用到的数据库操作类

此数据库操作封装类在一个省级项目中使用到,在一个集团公司的科技管理项目中也使用过.

package jing.dbnew;

import java.sql.*;
import java.util.*;
import javax.sql.rowset.CachedRowSet;
import oracle.jdbc.rowset.OracleCachedRowSet;
import com.sun.rowset.CachedRowSetImpl;
/**
* Title:数据库操作类,有数据事物控制功能,请注意main函数中的调用事例
* @author 欧朝敬
* QQ:35712069
* 手机:13873195792
* @version 1.0
*/
public class DBManager {
public DBManager(){

}

/**
* 开始事务
*
*/
public void beginTransaction() {
  try {
   Connection con = ConnectionFactory.getInstance().getConnection();
   con.setAutoCommit(false);
  } catch (Exception e) {
   e.printStackTrace();
  }
}
/**
* 回滚事务
*
*/
public void rollbackTransactoin() {
  try {
   Connection con = ConnectionFactory.getInstance().getConnection();
   con.rollback();
  } catch (Exception e) {
   e.printStackTrace();
  }
}

/**
* 提交事务
*
*/
public void commitTransaction() {
  try {
   Connection con = ConnectionFactory.getInstance().getConnection();
   con.commit();
   con.setAutoCommit(true);
   ConnectionFactory.getInstance().closeConnection();
  } catch (Exception e) {
   e.printStackTrace();
  }
}

/**
* 结束事务
*
*/
// public void endTransaction() {
//  try {
//   Connection con = ConnectionFactory.getInstance().getConnection();
//   con.commit();
//   con.setAutoCommit(true);
//   ConnectionFactory.getInstance().closeConnection();
//  } catch (Exception e) {
//   e.printStackTrace();
//  }
// }

public boolean execute(String sql) throws Exception {
  System.out.println("execute：" + sql);
  boolean re = false;
  Connection con = null;
  PreparedStatement pstmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt =con.prepareStatement(sql);
   re = pstmt.execute();
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  } finally {
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return re;
}

/**
* 批量执行SQL语句，在一个事物里
* @param sql
* @return
* @throws Exception
*/
public int[] executeBatch(String[] sql) throws Exception {
  int[] re=null;;
  Connection con = null;
  Statement stmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   con.setAutoCommit(false);
   stmt =con.createStatement();
   stmt.clearBatch();
   for(int i=0;i<sql.length;i++){
    stmt.addBatch(sql[i]);
    System.out.println("executeBatch：" + sql[i]);
   }
   re = stmt.executeBatch();
   con.commit();
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  }
  finally {
   if (stmt != null) {
    stmt.close();
   }
  }
  return re;
}

/**
*
* @param sql
* @param value
* @param type
* @return
* @throws Exception
*/
public boolean execute(String sql, String[] value, int[] type)
throws Exception {
  System.out.println("execute：" + sql);
  boolean re = false;
  Connection con = null;
  PreparedStatement pstmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
     ResultSet.CONCUR_UPDATABLE);
   this.setParameters(pstmt,value,type); //调用私有方法设置参数
   re = pstmt.execute();
  } catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  }finally {
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return re;
}

/**
* 执行查询，返回结果集隐式事物处理
* @param sql String 要执行的SELECT语句
* @return CachedRowSet 未查到记录则返回null
* @throws Exception
*/
public CachedRowSet executeQueryCachedRowSet(String sql) throws Exception {
  System.out.println("executeQueryCachedRowSet：" + sql);
  CachedRowSet crs = null;
  //OracleCachedRowSet crs=null;
  Connection con = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   /*stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
    * java.sql.SQLException: 不允许的操作: Unsupported syntax for refreshRow()
    * Oracle: Unsupported syntax for refreshRow()报此错使用以下方式解决
    * 1、con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
    * 2、con.createStatement();
   */
   pstmt=con.prepareStatement(sql);
   rs = pstmt.executeQuery();
   if (!(rs.isBeforeFirst() == rs.isAfterLast())) {
    crs = new CachedRowSetImpl();
    //crs = new OracleCachedRowSet();
    crs.populate(rs);
   }
  } catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  }finally {
   if (rs != null) {
    rs.close();
   }
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return crs;
}

/**使用OracleCachedRowSet实现，专门处理Oracle特有的SQL语句
* 执行查询，返回结果集隐式事物处理
* @param sql String 要执行的SELECT语句
* @return OracleCachedRowSet 未查到记录则返回null
* @throws Exception
*/
public OracleCachedRowSet executeQueryOracleCachedRowSet(String sql) throws Exception {
  System.out.println("executeQueryOracleCachedRowSet：" + sql);
  OracleCachedRowSet crs=null;
  Connection con = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   /*stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
    * java.sql.SQLException: 不允许的操作: Unsupported syntax for refreshRow()
    * Oracle: Unsupported syntax for refreshRow()报此错使用以下方式解决
    * 1、con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
    * 2、con.createStatement();
   */
   pstmt=con.prepareStatement(sql);
   rs = pstmt.executeQuery();
   if (!(rs.isBeforeFirst() == rs.isAfterLast())) {
    crs = new OracleCachedRowSet();
    crs.populate(rs);
   }
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  } finally {
   if (rs != null) {
    rs.close();
   }
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return crs;
}

/**
* 执行高效率的SELECT语句，使用ORACLE的SQL特点
* @param sql String 带?号的SELECT语句
* @param value String[] ?对应的值
* @param type int[] ?对应的值的数据库表中的类型
* @return CachedRowSet 未查到记录则返回null
* @throws Exception
*/
public CachedRowSet executeQueryCachedRowSet(String sql, String[] value,
   int[] type) throws Exception {
  System.out.println("executeQueryRowSet：" + sql);
  CachedRowSet crs = null;
  Connection con = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
     ResultSet.CONCUR_UPDATABLE);
   this.setParameters(pstmt,value,type); //调用私有方法设置参数
   rs = pstmt.executeQuery();
   if (!(rs.isBeforeFirst() == rs.isAfterLast())) {
    crs = new CachedRowSetImpl();
    crs.populate(rs);
   }
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  } finally {
   if (rs != null) {
    rs.close();
   }
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return crs;
}

/**
* 执行查询，返回Map单条记录，如查执行结果有多条记录的情况下也只返回第一条记录隐式事物处理
* @param sql String 要执行的SELECT语句
* @return Map 未查到记录则返回null，使用列名的大家做为Map的Key，列值对象为Map的value
* @throws Exception
*/
public Map executeQueryMap(String sql) throws Exception {
  System.out.println("executeQueryMap：" + sql);
  Map map = null;
  Connection con = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt =con.prepareStatement(sql);
   rs = pstmt.executeQuery();
   if (rs.next()) { // 有记录的情况
    map = new HashMap();
    ResultSetMetaData rsm = rs.getMetaData();
    int colnum = rsm.getColumnCount(); // 得到记录的列数
    for (int i = 1; i <= colnum; i++) {
     // rsm.getColumnName(i).toUpperCase()统一列名大写
     // rs.getObject(i)更的值为对象类型
     map
       .put(rsm.getColumnName(i).toUpperCase(), rs
         .getObject(i));
    }
   }
  } catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  }finally {
   if (rs != null) {
    rs.close();
   }
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return map;
}

/**
* 执行高效率的SELECT语句，使用ORACLE的SQL特点
* @param sql String 带？号的SELECT语句
* @param value String[] ？对应的值
* @param type int[] ？对应的值的数据库表中的类型
* @return Map 未查到记录则返回null，使用列名的大家做为Map的Key，列值对象为Map的value
* @throws Exception
*/
public Map executeQueryMap(String sql, String[] value, int[] type)
   throws Exception {
  System.out.println("executeQueryMap：" + sql);
  Map map = null;
  Connection con = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
     ResultSet.CONCUR_UPDATABLE);
   this.setParameters(pstmt,value,type); //调用私有方法设置参数
   rs = pstmt.executeQuery();
   if (rs.next()) { // 有记录的情况
    map = new HashMap();
    ResultSetMetaData rsm = rs.getMetaData();
    int colnum = rsm.getColumnCount(); // 得到记录的列数
    for (int i = 1; i <= colnum; i++) {
     // rsm.getColumnName(i).toUpperCase()统一列名大写
     // rs.getObject(i)更的值为对象类型
     map
       .put(rsm.getColumnName(i).toUpperCase(), rs
         .getObject(i));
    }
   }
  } catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  }finally {
   if (rs != null) {
    rs.close();
   }
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return map;
}

/**
* 执行更新语句INSERT,UPDATE or DELETE
* @param sql String 要执行的SQL语句
* @return int 如果执行INSERT,UPDATE or DELETE则返回影响的记录行数,如果执行没有返回值的语句则返回为0
* @throws Exception
*/
public int executeUpdate(String sql) throws Exception {
  System.out.println("executeUpdate：" + sql);
  int re = 0;
  Connection con = null;
  PreparedStatement pstmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt = con.prepareStatement(sql);
   re = pstmt.executeUpdate();
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  } finally {
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return re;
}

/**
* 执行更新语句INSERT,UPDATE or DELETE
* @param sql String 要执行的带有？号的INSERT,UPDATE or DELETE语句
* @param value String[] ？对应的值
* @param type int[] ？对应的值的数据库表中的类型
* @return int 如果执行INSERT,UPDATE or DELETE则返回影响的记录行数,如果执行没有返回值的语句则返回为0
* @throws Exception
*/
public int executeUpdate(String sql, String[] value, int[] type)
   throws Exception {
  System.out.println("executeUpdate：" + sql);
  int re = 0;
  Connection con = null;
  PreparedStatement pstmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   pstmt = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
     ResultSet.CONCUR_UPDATABLE);
   this.setParameters(pstmt,value,type); //调用私有方法设置参数
   re = pstmt.executeUpdate(); // 影响的记录行数
  }catch(Exception ex){
   ex.printStackTrace();
   con.rollback();
  } finally {
   if (pstmt != null) {
    pstmt.close();
   }
  }
  return re;
}

/**
私有方法用来设置
* @param pstmt PreparedStatement对象的参数
* @param value 参数值
* @param type   参数类型
* @throws Exception
*/
private void setParameters(PreparedStatement pstmt,String[] value,int[] type)throws Exception{
  int j = 1;
  for (int i = 0; i < value.length; i++) {
   switch (type[i]) {
   case Types.INTEGER:
    pstmt.setInt(j, Integer.parseInt(value[i]));
    System.out.println("Parameter("+i+")    INTEGER      "+value[i]);
    break;
   case Types.FLOAT:
   case Types.DOUBLE:
   case Types.DECIMAL:
   case Types.NUMERIC:
    pstmt.setDouble(j, Double.parseDouble(value[i]));
    System.out.println("Parameter("+i+")    FLOAT、DOUBLE、DECIMAL、NUMERIC      "+value[i]);
    break;
   case Types.CHAR:
   case Types.VARCHAR:
   case Types.LONGVARCHAR:
    pstmt.setString(j, value[i]);
    System.out.println("Parameter("+i+")    CHAR、VARCHAR、LONGVARCHAR      "+value[i]);
    break;
   case Types.DATE:
   case Types.TIMESTAMP:
    pstmt.setString(j, value[i]);
    System.out.println("Parameter("+i+")    DATE、TIMESTAMP      "+value[i]);
    break;
   case Types.BOOLEAN:
    // Boolean.parseBoolean(value[i]) JDK5API
    pstmt.setBoolean(j, Boolean.getBoolean(value[i]));
    System.out.println("Parameter("+i+")    BOOLEAN      "+value[i]);
    break;
   }
   j = j + 1;
  }
}

/**
* 执行记录的查询(调用存储过程)
* @param procName：调用存储过程的名称；
* @param returnType:游标返回类型
* 0为CachedRowSet以及各种类型
* @param outParameter：传入输出参数的类型，例如：new int[]{Types.REF,Types.REF,Types.VARCHAR},
* 表示所调用的存储过程前两个输出结果的类型为游标类型，第三个输出结果的类型为VARCHAR2类型。
* @param args       所调用存储过程的输入参数
* @return List<Object> 存储过程的输出结果
*
*/
public List<Object> executeProc(String procName,int returnType,int[] outParameter,Object... args) throws Exception {
  List<Object> list = null;
  Connection con = null;
  CallableStatement cstmt = null;
  try {
   con = ConnectionFactory.getInstance().getConnection();
   int iInStart = 1;// 存储过程输入参数的起始位
   // 统计问号的个数
   int parameterCount = args.length+outParameter.length; //调用的存储过程的总参数个数
   // 组装带问号的SQL
   String sql = "{call " + procName + "(";
   for (int i = 1; i <= parameterCount; i++) {
    if (i == parameterCount){
     sql += "?";
    }else{
     sql += "?,";
    }
   }
   sql += ")}";
   System.out.println("executeProc："+sql);
   cstmt = con.prepareCall(sql);
   for (int i = 0; i < args.length; i++) {// 循环设定存储过程的输入参数
    cstmt.setObject(iInStart + i, args[i]);
    System.out.println("设置输入参数:"+iInStart+" "+args[i]);
   }
   int iOutStart = args.length + iInStart;// 存储过程输出参数的起始位
   for (int i = 0; i < outParameter.length; i++) {// 循环设定存储过程的输出参数
    if (outParameter[i]==Types.REF){ //代表游标
     cstmt.registerOutParameter(i + iOutStart, oracle.jdbc.driver.OracleTypes.CURSOR);
     System.out.println("设置输出参数:"+(i + iOutStart)+" 游标");
    }else if((outParameter[i]==Types.INTEGER)){
     cstmt.registerOutParameter(i + iOutStart, Types.INTEGER);
     System.out.println("设置输出参数:"+(i + iOutStart)+" 数值型");
    }else{
     cstmt.registerOutParameter(i + iOutStart, Types.VARCHAR);
     System.out.println("设置输出参数:"+(i + iOutStart)+" 字符型");
    }
   }
   cstmt.execute(); //执行
   list = new ArrayList<Object>();
   switch (returnType) {
   case 0:// 把存储过程中返回的游标转换为CachedRowSet类型输出
    for (int i = 0; i < outParameter.length; i++) {// 循环获取存储过程的输出结果，包括游标、字符串
     if (outParameter[i]==Types.REF) { //处理游标
      CachedRowSet crs=new CachedRowSetImpl();
      //OracleCachedRowSet crs=new OracleCachedRowSet(); //使用Oracle10g的数据则必须要用10g的驱动,Oracle 10g驱动解决了“ORA-01002: 读取违反顺序”这个问题
      if (cstmt.getObject(i + iOutStart) != null){
       crs.populate((ResultSet)cstmt.getObject(i + iOutStart));
      }
      list.add(crs);
     } else{ //非游标
      list.add(cstmt.getObject(i + iOutStart));
     }
    }
    break;
   }
  } catch (Exception ex) {
   ex.printStackTrace();
   con.rollback();
  } finally {
   cstmt.close();
  }
  return list;
}

public static void main(String[] args) throws Exception {
  //DBManager dbm = new DBManager();
  //dbm.execute("update dept set dname=? where deptno=? ",new String[]{"sdfsdfsad","51"},new int[]{Types.VARCHAR,Types.NUMERIC});
  // Connection con = SingletonDataSource.getInstance().getConnection();
  // CachedRowSet crs = dbm.executeQueryRowSet(
  // "SELECT EMPNO,ENAME,JOB,MGR,HIREDATE,SAL,COMM,DEPTNO FROM EMP WHERE
  // EMPNO >7654",
  // con);
  // while (crs.next()) {
  // System.out.println(crs.getString("EMPNO") + " " +
  // crs.getString("ENAME"));
  // }
  // System.out.println("########################");
  // Map map = dbm.executeQueryMap(
  // "SELECT EMPNO,ENAME,JOB,MGR,HIREDATE,SAL,COMM,DEPTNO FROM EMP WHERE
  // EMPNO=7654",
  // con);
  // System.out.println(map.get("EMPNO") + " " + map.get("ENAME") + " " +
  // map.get("COMM"));
  // con.close();
  /*
   * String sql = "select * from emp where comm=?"; String[] value = new
   * String[] {"500"}; int[] type = {Types.DOUBLE}; Map map =
   * dbm.executeQueryMap(sql, value, type, null); //Map map =
   * dbm.executeQueryMap("select * from emp where empno=? and ename=?",new
   * String[] {"7654","MARTIN"},new int[]{Types.INTEGER,Types.VARCHAR},
   * null); if (map != null) { System.out.println(map.get("EMPNO") + " " +
   * map.get("ENAME")); }
   */
  /*
   * String sql = "select * from emp where empno>?"; String[] value = new
   * String[] {"7693"}; int[] type = {Types.INTEGER}; CachedRowSet crs =
   * dbm.executeQueryRowSet(sql, value, type, null); boolean isprint =
   * true; while (crs.next()) { ResultSetMetaData rsmd =
   * crs.getMetaData(); int colcount = rsmd.getColumnCount(); if (isprint) {
   * isprint=false; for (int i = 0; i < colcount; i++) {
   * System.out.print(rsmd.getColumnName(i + 1) + "/t/t"); }
   * System.out.println(); } for (int i = 0; i < colcount; i++) {
   * System.out.print(crs.getString(i + 1)+"/t/t"); }
   * System.out.println(); }
   */
  /*
   * String sql = "update emp set comm=? where comm=?"; String[] value =
   * new String[] {"56.22", "0"}; int[] type = {Types.DOUBLE,
   * Types.INTEGER}; System.out.println(dbm.executeUpdate(sql, value,
   * type, null));
   */
  // System.out.println(dbm.selectList("test", "empno", "ename", true,
  // "","select * from emp", null, null));


  //DBManager dbmt = new DBManager();
/*  //有事物操作示例
   dbmt.beginTransaction();
  try{
   dbmt.execute("insert into emp values (1234, 'TEST', 'TEST', 0, to_date('2008-03-12', 'yyyy-mm-dd'), 0, 0, 10)");
   dbmt.execute("insert into emp values (1235, 'TEST', 'TEST', 0, to_date('2008-03-12', 'yyyy-mm-dd'), 0, 0, 10)");
   //dbmt.commitTransaction();
  }catch(Exception ex){
   dbmt.rollbackTransactoin();
  }*/
  //自动事物处理
  //dbmt.execute("insert into emp values (1236, 'TEST', 'TEST', 0, to_date('2008-03-12', 'yyyy-mm-dd'), 0, 0, 10)");
}

}

package jing.dbnew;

import java.sql.*;
import javax.sql.*;
import javax.naming.*;

/**
* <p>
* Title: 使用单实例进行数据库连接池中的数据库连接获取
* @author 欧朝敬
* QQ:35712069
* 手机:13873195792
* @version 1.0
*/
public class ConnectionFactory {
private static DataSource ds = null;
private static ConnectionFactory cf = new ConnectionFactory();
private static final ThreadLocal<Connection> threadLocal = new ThreadLocal<Connection>(); //线程本地变量

private ConnectionFactory() {
  try {
   InitialContext ctx = new InitialContext();
   // 使用时改成正确的数据配置
   //ds = (DataSource) ctx.lookup("jdbc/OracleSource");
   //TomCat中的连接池获取方式使用java:/comp/env/
   ds = (DataSource) ctx.lookup("java:/comp/env/jdbc/OracleSource");
  } catch (NamingException ne) {
   System.out.println(ne.getMessage() + "/n没有使用连接池！");
  }
}

public static ConnectionFactory getInstance() {
return cf;
}

public Connection getConnection() throws Exception {
  Connection con = threadLocal.get();
  if (con == null) {
   if (ds == null) {
    // 使用时改成正确的数据配置
    Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
    String url = "jdbc:oracle:thin:@localhost:1521:sample";
    con = DriverManager.getConnection(url, "scott", "tiger");
   } else {
    con = ds.getConnection();
   }
   //System.out.println("未使用线程中的连接！");
   threadLocal.set(con);
  }else{
   //System.out.println("使用线程中的连接！");
  }
  return con;
  /**
   * 如果不做Main方法的调试则使用如下方法体 return ds.getConnection();
   */
}

/**
* 关闭连接<br>
* 同时删除当前线程关联的连接对象，Client不能对用getConnection()方法获得的连接直接调用con.close()方法，必须使用此方法closeConnection()进行连接的关闭
*/
public void closeConnection() {
  Connection con = threadLocal.get();
  if (con != null) {
   try {
    con.close();
    threadLocal.set(null);
    con=null;
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
}

public static void main(String[] args) throws Exception {
  /**
   * 调用方式如下
   */
  Connection con =ConnectionFactory.getInstance().getConnection();
  ConnectionFactory.getInstance().closeConnection();
  con.createStatement();
}
}

-------------------------------------------------------------------------------------------------

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