本人用的数据库操作类,可能不是很完善,不过很实用
代码如下:
package xaut.dataPool;
import java.util.ArrayList;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.Context;
public class DatabaseBean {
private DatabaseConfigure databaseConfigure = null;
public Connection conn = null;
public Statement stmt = null;
private CallableStatement cstmt = null;
public DatabaseBean(DatabaseConfigure databaseConfigure) {
this.databaseConfigure = databaseConfigure;
}
/**
* 获取当前连接
*
* @return 返回当前连接connection
*/
public Connection getConnection(){
return this.conn;
}
/**
* 直接连接数据库,效率低
*
* @throws Exception 连接失败异常
*/
public void getDirectConnect()throws Exception{
if(this.conn==null){
try {
Class.forName(databaseConfigure.getJdbcDriver());
} catch (ClassNotFoundException e) {
System.out.println(" class not found: " + e.getMessage());
e.printStackTrace();
throw new SQLException("-Database driver notFind ");
}
try {
conn = DriverManager.getConnection(databaseConfigure
.getDatabaseURL(), databaseConfigure
.getDatabaseName(), databaseConfigure
.getDatebasePassword());
} catch (SQLException sqlex) {
System.err.println("DatabaseBean connection error"
+ sqlex.getMessage());
sqlex.printStackTrace();
throw new SQLException("-Database connection error ");
}
}
}
/**
* 通过数据库连接池连接,效率高
* 需要配置数据库连接池
* @throws Exception 连接失败异常
*/
public void getConnectFromdataPool()throws Exception{
if (this.conn == null) {
Context initCtx = new InitialContext();
DataSource ds = (DataSource) initCtx.lookup(this.databaseConfigure.getDatapool());
if (ds != null)
conn = ds.getConnection();
}
}
/**
* 此函数以后不建议使用,由于历史遗留问题保留
* @throws Exception
*/
public void connection() throws Exception {
if (this.conn == null) {
/*
// 先通过数据库连接池连接
if (this.databaseConfigure.getDatapool() != null) {
Context initCtx = new InitialContext();
DataSource ds = (DataSource) initCtx.lookup(this.databaseConfigure.getDatapool());
if (ds != null)
conn = ds.getConnection();
} else {
*/
//如果没有数据库连接池,则直接连接
try {
Class.forName(databaseConfigure.getJdbcDriver());
} catch (ClassNotFoundException e) {
System.out.println(" class not found: " + e.getMessage());
e.printStackTrace();
throw new SQLException("-Database driver notFind ");
}
try {
conn = DriverManager.getConnection(databaseConfigure
.getDatabaseURL(), databaseConfigure
.getDatabaseName(), databaseConfigure
.getDatebasePassword());
} catch (SQLException sqlex) {
System.err.println("DatabaseBean connection error"
+ sqlex.getMessage());
sqlex.printStackTrace();
throw new SQLException("-Database connection error ");
}
//}
}
}
public void disconnect() throws SQLException {
try {
if (stmt != null) {
stmt.close();
//注意调用close后,该变量不为null,如果再以stmt!=null为条件,将引发错误
stmt=null;
}
if (conn != null) {
conn.close();
//注意调用close后,与数据库的连接返还给了数据库连接池,但该变量不为null,
//如果再以判断conn!=null为条件,将引发错误
conn=null;
}
} catch (SQLException e) {
System.err.println("DatabaseBean disconnect error");
e.printStackTrace();
throw new SQLException("-Database disConnection error ");
}
}
public boolean isConnected() {
return (conn != null);
}
public ResultSet excutequery(String sql) throws SQLException {
ResultSet rs1 = null;
try {
if (!isConnected())
this.connection();
if (this.stmt == null)
stmt = conn.createStatement();
rs1 = stmt.executeQuery(sql);
return rs1;
} catch (Exception e) {
System.err.println("DatabaseBean query error" + e.getMessage());
e.printStackTrace();
throw new SQLException("-Query error ");
}
}
public boolean execute(String sql) throws SQLException {
try {
if (!isConnected())
this.connection();
if (this.stmt == null)
stmt = conn.createStatement();
return stmt.execute(sql);
} catch (Exception e) {
System.err.println("DatabaseBean execute error" + e.getMessage());
e.printStackTrace();
throw new SQLException("-Execute error ");
}
}
public void statementClose() {
try {
if (stmt != null)
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
public ResultSet callQueryProcedure(String sql) throws SQLException {
ResultSet rs = null;
try {
if (!isConnected())
this.connection();
if (this.cstmt == null)
cstmt = conn.prepareCall(sql);
cstmt.executeQuery();
} catch (Exception e) {
System.err.println("DatabaseBean callQueryProcedure error"
+ e.getMessage());
e.printStackTrace();
throw new SQLException("-CallQueryProcedure error ");
}
return rs;
}
public boolean callExecuteProcedure(String sql) throws SQLException {
try {
if (!isConnected())
this.connection();
if (this.cstmt == null)
cstmt = conn.prepareCall(sql);
return cstmt.execute();
} catch (Exception e) {
System.err.println("DatabaseBean callExecuteProcedure error"
+ e.getMessage());
e.printStackTrace();
throw new SQLException("-CallExecuteProcedure error ");
}
}
public void executeBatch(ArrayList sqlBatch) throws SQLException {
try {
if (!isConnected())
this.connection();
conn.setAutoCommit(false);
if (this.stmt == null)
stmt = conn.createStatement();
for (int i = 0; i < sqlBatch.size(); i++) {
stmt.addBatch((String) sqlBatch.get(i));
}
stmt.executeBatch();
conn.commit();
conn.setAutoCommit(true);
} catch (Exception e) {
System.err.println("DatabaseBean executeBatch error"
+ e.getMessage());
e.printStackTrace();
throw new SQLException("-ExecuteBatch error ");
}
}
public PreparedStatement createprepareStatement(String paramSQL)
throws SQLException {
try {
if (!isConnected())
this.connection();
return conn.prepareStatement(paramSQL);
} catch (Exception e) {
System.err.println("DatabaseBean PreparedStatement error");
e.printStackTrace();
throw new SQLException("-DatabaseBean PreparedStatement error ");
}
}
public void transactionStart() throws SQLException {
try {
conn.setAutoCommit(false);
} catch (SQLException e) {
System.err.println("DatabaseBean transactionStart");
e.printStackTrace();
throw new SQLException("-Transaction start error ");
}
}
public void transactionEnd() throws SQLException {
try {
conn.commit();
conn.setAutoCommit(true);
} catch (SQLException e) {
System.err.println("DatabaseBean transactionEnd error");
e.printStackTrace();
throw new SQLException("-Transaction end error:");
}
}
public void transactionRollback() throws SQLException {
try {
conn.rollback();
} catch (SQLException e) {
System.err.println("DatabaseBean transactionRollback error");
e.printStackTrace();
throw new SQLException("-Transaction rollback error ");
}
}
}
//配置文件静态类
package com.datapool;
public class DatabaseConfigure {
/**静态类*/
private static DatabaseConfigure instance = null;
private String databaseName="hdptdep";
private String datebasePassword="123456";
private String databaseURL="jdbc:oracle:thin:@192.168.88.49:1521:hdptdb";
private String jdbcDriver="oracle.jdbc.driver.OracleDriver";
/** 数据库连接池名称*/
private String datapool="java:comp/env/jdbc/hdptdep";
/**
* 构造函数
*/
private DatabaseConfigure() {
}
/**
* 单例函数
*
* @return 一个实例
*/
public static DatabaseConfigure getInstance() {
if (instance == null) {
instance = new DatabaseConfigure();
}
return instance;
}
public String getDatabaseName() {
return this.databaseName;
}
public void setDatabaseName(String databaseName) {
this.databaseName = databaseName;
}
public String getDatebasePassword() {
return this.datebasePassword;
}
public void setDatebasePassword(String datebasePassword) {
this.datebasePassword = datebasePassword;
}
public String getDatabaseURL() {
return this.databaseURL;
}
public void setDatabaseURL(String databaseURL) {
this.databaseURL = databaseURL;
}
public String getJdbcDriver() {
return this.jdbcDriver;
}
public void setJdbcDriver(String jdbcDriver) {
this.jdbcDriver = jdbcDriver;
}
public String getDatapool() {
return datapool;
}
public void setDatapool(String datapool) {
this.datapool = datapool;
}
}
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