DBConnect.java
上传用户:toby834
上传日期:2013-10-21
资源大小:2613k
文件大小:4k
- package net.acai.database;
- import java.sql.*;
- import net.acai.database.DBConnectionManager;
- /**
- * Title: 清清网络
- * Description:
- * Copyright: Copyright (c) 2002
- * Company: 211.68.39.120、webcpu.51.net
- * @author: SuperSpace
- * @version 1.0
- */
- public class DBConnect {
- private Connection conn = null;
- private Statement stmt = null;
- private PreparedStatement prepstmt = null;
- private DBConnectionManager dcm=null;
- void init() {
- dcm = DBConnectionManager.getInstance();
- conn = dcm.getConnection("mysql");
- }
- /**
- * 构造数据库的连接和访问类
- */
- public DBConnect() throws Exception {
- init();
- stmt = conn.createStatement();
- }
- public DBConnect(int resultSetType, int resultSetConcurrency)
- throws Exception {
- init();
- stmt = conn.createStatement(resultSetType, resultSetConcurrency);
- }
- /**
- * 构造数据库的连接和访问类
- * 预编译SQL语句
- * @param sql SQL语句
- */
- public DBConnect(String sql) throws Exception {
- init();
- this.prepareStatement(sql);
- }
- public DBConnect(String sql, int resultSetType, int resultSetConcurrency)
- throws Exception {
- init();
- this.prepareStatement(sql, resultSetType, resultSetConcurrency);
- }
- /**
- * 返回连接
- * @return Connection 连接
- */
- public Connection getConnection() {
- return conn;
- }
- /**
- * PreparedStatement
- * @return sql 预设SQL语句
- */
- public void prepareStatement(String sql) throws SQLException {
- prepstmt = conn.prepareStatement(sql);
- }
- public void prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
- throws SQLException {
- prepstmt = conn.prepareStatement(sql, resultSetType, resultSetConcurrency);
- }
- /**
- * 设置对应值
- *
- * @param index 参数索引
- * @param value 对应值
- */
- public void setString(int index,String value) throws SQLException {
- prepstmt.setString(index, value);
- }
- public void setInt(int index,int value) throws SQLException {
- prepstmt.setInt(index,value);
- }
- public void setBoolean(int index,boolean value) throws SQLException {
- prepstmt.setBoolean(index,value);
- }
- public void setDate(int index,Date value) throws SQLException {
- prepstmt.setDate(index,value);
- }
- public void setLong(int index,long value) throws SQLException {
- prepstmt.setLong(index,value);
- }
- public void setFloat(int index,float value) throws SQLException {
- prepstmt.setFloat(index,value);
- }
- public void setBytes(int index,byte[] value) throws SQLException{
- prepstmt.setBytes(index,value);
- }
-
- public void clearParameters()
- throws SQLException
- {
- prepstmt.clearParameters();
- prepstmt=null;
- }
- /**
- * 返回预设状态
- */
- public PreparedStatement getPreparedStatement() {
- return prepstmt;
- }
- /**
- * 返回状态
- * @return Statement 状态
- */
- public Statement getStatement() {
- return stmt;
- }
- /**
- * 执行SQL语句返回字段集
- * @param sql SQL语句
- * @return ResultSet 字段集
- */
- public ResultSet executeQuery(String sql) throws SQLException {
- if (stmt != null) {
- return stmt.executeQuery(sql);
- }
- else return null;
- }
- public ResultSet executeQuery() throws SQLException {
- if (prepstmt != null) {
- return prepstmt.executeQuery();
- }
- else return null;
- }
- /**
- * 执行SQL语句
- * @param sql SQL语句
- */
- public void executeUpdate(String sql) throws SQLException {
- if (stmt != null)
- stmt.executeUpdate(sql);
- }
- public void executeUpdate() throws SQLException {
- if (prepstmt != null)
- prepstmt.executeUpdate();
- }
- /**
- * 关闭连接
- */
- public void close() throws Exception {
- if (stmt != null) {
- stmt.close();
- stmt = null;
- }
- if (prepstmt != null) {
- prepstmt.close();
- prepstmt = null;
- }
- if (conn!=null)
- {
-
- dcm.freeConnection("mysql",conn);
-
- }
-
- }
- }