JDBC连接MySQL【摘编】

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JDBC连接MySQL【摘编】

之一：

JDBC连接MySQL

加载及注册JDBC驱动程序

Class.forName("com.mysql.jdbc.Driver");

Class.forName("com.mysql.jdbc.Driver").newInstance();

JDBCURL定义驱动程序与数据源之间的连接

标准语法：

<protocol（主要通讯协议）>:<subprotocol（次要通讯协议，即驱动程序名称）>:<datasourceidentifier（数据源）>

MySQL的JDBCURL格式：

jdbc:mysql//[hostname][:port]/[dbname][?param1=value1][&param2=value2]….

示例：jdbc:mysql://localhost:3306/sample_db?user=root&password=your_password

常见参数：

user用户名

password密码

autoReconnect联机失败，是否重新联机（true/false）

maxReconnect尝试重新联机次数

initialTimeout尝试重新联机间隔

maxRows传回最大行数

useUnicode是否使用Unicode字体编码（true/false）

characterEncoding何种编码（GB2312/UTF-8/…）

relaxAutocommit是否自动提交（true/false）

capitalizeTypeNames数据定义的名称以大写表示

建立连接对象

Stringurl="jdbc:mysql://localhost:3306/sample_db?user=root&password=your_password";

Connectioncon=DriverManager.getConnection(url);

建立SQL陈述式对象（StatementObject）

Statementstmt=con.createStatement()；

执行SQL语句

executeQuery()

Stringquery="select*fromtest";

ResultSetrs=stmt.executeQuery(query);

结果集ResultSet

while(rs.next())

{rs.getString(1);rs.getInt(2);}

executeUpdate()

Stringupd="insertintotest(id,name)values(1001,xuzhaori)";

intcon=stmt.executeUpdate(upd);

execute()

示例：

try

{

}

catch(SQLExceptionsqle)

{

}

finally

{

}

Java类型和SQL类型技术手册P421

PreparedStatement（预编语句）

PreparedStatementstmt=conn.prepareStatement("insertintotest(id,name)values(?,?)");

stmt.setInt(1,id);

stmt.setString(2,name);

注：一旦设定语句的参数值后，就可以多次执行改语句，直到调用clearParameters（）方法将他清除为止

CallableStatement（预储程序）技术手册P430

JDBC2.0使用

ResultSet对象中的光标上下自由移动

Statementstmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);

ResultSetrs=stmt.executeQuery("select*fromtest");

publicStatementcreateStatement(intresultSetType,intresultSetConcuttency)throwsSQLException

resultSetType

TYPE_FORWARD_ONLY只能使用next（）方法。

TYPE_SCROLL_SENSITIVE可以上下移动，可以取得改变后的值。

TYPE_SCROLL_INSENSITIVE可以上下移动。

resultSetConcuttency

CONCUR_READ_ONLY只读

CONCUR_UPDATABLEResultSet对象可以执行数据库的新增、修改、和移除

直接使用ResultSet对象执行更新数据

新增数据

Statementstmt＝con.createStatement（ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE）;

ResultSetuprs=stmt.executeQuery("select*fromtest");

uprs.moveToInsertRow();

uprs.updateInt(1,1001);

uprs.updateString(2,"许召日");

uprs.insertRow;

更新数据

Statementstmt＝con.createStatement（ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE）;

ResultSetuprs=stmt.executeQuery("select*fromtest");

uprs.last();

uprs.updateString("name","xuzhaori");

uprs.updateRow;

删除数据

Statementstmt＝con.createStatement（ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE）;

ResultSetuprs=stmt.executeQuery("select*fromtest");

uprs.absolute(4);

uprs.deleteRow();

批处理

con.setAutoCommit(false);关闭自动认可模式

Statementstmt=con.createStatement();

int[]rows;

stmt.addBatch("insertintotestvalues(1001,xuzhaori)");

stmt.addBatch("insertintotestvalues(1002,xuyalin)");

rows=stmt.executeBatch();

con.commit();没有任何错误，执行批处理stmt.executeBatch();

JNDI-数据源（DataSource）与连接池（ConnectionPool）

Tomcat的JDBC数据源设置技术手册P439

连接池工具－ProxoolVar0.8.3技术手册P446

设置web.xml

<?xmlversion="1.0"encoding="ISO-8859-1"?>

<!--<?xmlversion="1.0"encoding="GB2312"?>-->

<web-appxmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

….

<servlet>

<servlet-name>ServletConfigurator</servlet-name>

<servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>

<init-param>

<param-name>propertyFile</param-name>

<param-value>WEB-INF/classes/Proxool.properties</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

后端统计端口添加下列

<servlet>

<servlet-name>Admin</servlet-name>

<servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>Admin</servlet-name>

<url-pattern>/Admin</url-pattern>

</servlet-mapping>

….

</web-app>

配置Proxool.properties

jdbc-0.proxool.alias=JSPBook

jdbc-0.proxool.driver-class=com.mysql.jdbc.Driver

jdbc-0.proxool.driver-url=jdbc:mysql://localhost:3306/sample_db?user=root&password=browser&useUnicode=true&characterEncoding=UTF-8

jdbc-0.proxool.maximum-connection-count=10

jdbc-0.proxool.prototype-count=4

jdbc-0.proxool.house-keeping-test-sql=selectCURRENT_DATE

jdbc-0.proxool.verbose=true

jdbc-0.proxool.statistics=10s,1m,1d后端统计接口添加此行

jdbc-0.proxool.statistics-log-level=DEBUG

使用Proxool连接池

Connectioncon=DriverManager.getConnection("proxool.JSPBook");

Statementstmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

Stringquery="SELECT*FROMemployee";

ResultSetrs=stmt.executeQuery(query);

---

之二：

预备

• 下载驱动包,ftp://sunxin.org:22/downloads/resources/mysql-connector-java-3.1.7-bin.jar
• 使用它有两种方式,最简便的就把它放在%JAVA_HOME%/jre/lib/ext下,%JAVA_HOME%是jdk的安装目录,例如D:/j2sdk1.4.2_15,第二种方法就是指定classpath,使其指向这个.jar文件

下面正式开始

因为会使用Connection,Statement,ResultSet类,因此需要import java.sql.*;

连接数据库中可能会抛出异常,所以所有语句放在try中

定义一些常用变量(都可以见名识义的),方便下面的语句,也可以让程序更容易理解,具体见代码

Step1:装载驱动类

见后面代码

Step2:连接数据库

使用DriverManager的静态方法getConnection完成,返回一个connection的对象,这就是连接上指定数据库的连接,这个连接是十分宝贵的资源,应及时关闭.

Step3:操作数据库

Statement对象里通常放sql语句,而ResultSet是查询返回的结果集,具体见下面的代码

import java.sql. * ;


class linkMysqlByJDBC ... {
publicstaticvoidmain(String[]args)...{
try...{
Stringdriver="org.gjt.mm.mysql.Driver";//驱动类
Stringurl="jdbc:mysql://localhost:3306/TestDB";
//连接字符串其中TestDB是数据库名
Stringusername="root";//用户名
Stringpassword="123654";//密码

Connectioncon=null;
Statementsm=null;
ResultSetrs=null;

//////Step1//////////
Class.forName(driver);

//////Step2//////////
con=DriverManager.getConnection(url,username,password);

//////Step3//////////
Stringsql="insertintotvalues('Pitt','[email protected]')";
sm=con.createStatement();

sm.execute(sql);

Stringsql2="select*fromt";
rs=sm.executeQuery(sql2);
while(rs.next())...{
System.out.println(rs.getString("Name")+""+
rs.getString("Email"));
}

con.close();
}catch(Exceptione)...{
e.printStackTrace();
}
}
}

---

之三：

import java.sql.*;
public class TestMysql{

public static void main(String args[]){

try{
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
}
catch(Exception e){
System.out.println("JDBC MYSQL failed.");
return;
}
System.out.println("JDBC MYSQL ok.");

try{
Connection con=DriverManager.getConnection("jdbc:mysql://127.0.0.1:330
6/mysql?user=root");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from user");
ResultSetMetaData rsmd=rs.getMetaData();
int numberofColumns=rsmd.getColumnCount();
while(rs.next()){
for(int i=1;i<=numberofColumns;i++){
System.out.println(rs.getString(i)+" ");
}
System.out.println("");
}

System.out.println("Connection ok.");

stmt.close();
con.close();
}
catch(Exception e){
System.out.println(e);
}

}
}
------------------------------------------------------------------------------------------------------------------------------

Connection conn;
/**
* 连接到数据库
* 首先你必须拼一个数据库连接的Url
* 格式如：jdbc:mysql://<[IP]>:<[PORT]>/<[DBNAME]>?user=<[DBUSER]>&password=<[DBPASSWORD]>
*/

String DB_Addr = "localhost";
String DB_Name = "myfile";
String DB_User = "root";
String DB_Password = "";
String DB_CharSet = "GB2312";
String DB_Conn_String = "jdbc:mysql://"+DB_Addr+"/"+DB_Name+"?user="+DB_User+"&password="+DB_Password+"&useUnicode=true&characterEncoding="+DB_CharSet;

try
{
/**
* String ClassForName = "com.mysql.jdbc.Driver";
* Class.forName(ClassForName).newInstance();
* 实际上这种方法更好
*/
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
conn=DriverManager.getConnection(DB_Conn_String);
return conn;
}
catch(Exception e)
{
e.printStackTrace();
return null;
}
-------------------------------------------------------------------------------------------------------------------------------

JDBC Name: Connector/J 3.0
URL: http://www.mysql.com/
Version: 3.0.8-stable
Download URL: http://www.mysql.com/downloads/api-jdbc-stable.html

语法

Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://host:port/database","user","password");

编程

1、用DriverManager登记mm.mysql
mm.mysql的class名为org.gjt.mm.mysql.Driver,登记时必须写成
Class.forName("org.gjt.mm.mysql.Driver").newInstance();

2、jdbc url参数说明
url格式：jdbc:mysql://[hostname][:port]/dbname[?param1=value1][?m2=value2]...
参数名 取值 缺省
user 数据库用户名 无
password 数据库用户口令 无
autoReconnect 当数据库连接丢失时是否自动连接，取值true/false false
maxReconnects 如果autoReconnect为true,此参数为重试次数，缺省为3次 3
initialTimeout 如果autoReconnect为true,此参数为重新连接前等待的秒数 2
maxRows 设置查询时返回的行数，0表示全部 0
useUnicode 是否使用unicode输出，true/false false
characterEncoding 如果useUnicode,该参数制定encoding类型，建议使用8859_1 无

提示
同时使用useUnicode,characterEncoding,能解决数据库输出时的中文问题
如:jdbc:mysql://localhost/test?user=root&useUnicode=true;characterEncoding=8859_1

实际例子，举一个简单的例子
这个jsp例子使用一个库，该库只有一个表（地址簿)

create database addressbook
use addressbook
create table addressbook (id int auto_increment primary key,name varchar(30),address varchar(255),phone varchar(20));

插入记录
insert into addressbook (name,address,phone) values ('jjx','zhejiang yuyao','0574-2222222');

jsp代码：代码中使用了absolute,ResultSet.TYPE_SCROOL_SENSITIVE等的目录是为了测试mm.mysql是否符合jdbc 2.0的规范
<%@ page import="java.sql.*" %>
<%
out.println("通讯录！");

try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();

}
catch (Exception E) {
out.println("Unable to load driver.");

}

try {
Connection C = DriverManager.getConnection("jdbc:mysql://localhost/addressbook?user=root&password=jjx&useUnicode=true&characterEncoding=8859_1");
Statement s=C.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet rs=s.executeQuery("select * from addressbook");
out.println("<table border=1>");
int i=1;
for (i=10;i<20;i++)
{
if (rs.absolute(i))
{
out.println("<tr><td>");
out.println(rs.getString(1));
out.println("</td>");
out.println("<td>");
out.print(rs.getString(2));
out.println("</td>");
out.println("<td>");
out.print(rs.getString(3));
out.println("</td></tr>");
}
else
{
break;
}

}
out.println("</table>");
rs.close();
s.close();
C.close();

}
catch (SQLException E) {
out.println("SQLException: " + E.getMessage());
out.println("SQLState: " + E.getSQLState());
out.println("VendorError: " + E.getErrorCode());
}

%>

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

1． 加载一个对应<nobr style="border-bottom: 1px dotted rgb(102, 0, 255); color: rgb(102, 0, 255); background-color: transparent; text-decoration: underline;" target="_blank">数据</nobr>库的JDBC驱动

　　在建立到一个数据库的连接之前，必须先加载这个数据库的JDBC驱动程序，加载之后此driver会自动注册到JDBC驱动列表中。加载一个JDBC驱动有两种<nobr style="border-bottom: 1px dotted rgb(102, 0, 255); color: rgb(102, 0, 255); background-color: transparent; text-decoration: underline;" target="_blank">方法</nobr>。

　　a） 在命令行方式下指定驱动器或者用冒号分割驱动器列表：

　　具体命令如下：

C:/>java –Djdbc.drivers = com.company1.Driver:com.company2.Driver youProject

　　b)第二种方法，在程序中调用Class.forName（）方法。<nobr style="border-bottom: 1px dotted rgb(102, 0, 255); color: rgb(102, 0, 255); background-color: transparent; text-decoration: underline;" target="_blank">推荐</nobr>使用。。。。

try

　　{

　　 String driverName = “com.imaginary.sql.msql.MsqlDriver”;

　　 Class.forName(driverName).newInstance();

　　}

Catch(ClassNotFoundException e1)

{

//catch could not find database driver exception.

}

---

<!-- 以下为对比MSSQL实例-->
<% @page import = " java.sql.* " contentType = " text/html;charset=GBK " %>
<% @page import = " java.util.* " %>
< html >
< head >
< title > rootkit </ title >
< scripttype = " javascript " >
vardb = " master " ;
functiongetTables() ... {
window.open("<%=request.getRequestURL().toString()%>?action=getTables&db="+db,"","scrollbars=yes");
}

functionlogout() ... {
location.href="<%=request.getRequestURL().toString()%>?action=logout";
}

functionchangevalue(select) ... {
document.getElementById("sqlcmd").value="use"+select.options[select.selectedIndex].value+";select*fromsysobjects";
}
</ script >
</ head >
< bodybgcolor = " #ffffff " >
< basehref = " <%=request.getRequestURL()%> " />
<%
if ((session.getAttribute( " conn " ) == null && request.getParameter( " username " ) == null ) || request.getParameter( " action " ) == null ) ... {
%>
<formmethod="post"action="?action=getConn">
<tablecellpadding="0"cellspacing="0"width="200"border="1">
<tr>
<td>
IP:
</td>
<td>
<inputname="ip"type="text"id="ip">
</td>
</tr>
<tr>
<td>
USERNAME:
</td>
<td>
<inputname="username"type="text"id="username">
</td>
</tr>
<tr>
<td>
PASSWORD:
</td>
<td>
<inputname="password"type="password"id="password">
</td>
</tr>
<tr>
<td>
PORT:
</td>
<td>
<inputname="port"type="text"id="port">
</td>
</tr>
</table>
<p>
<inputname="btnok"type="submit"id="btnok"value="连接">
</p>
</form>
<%
return;
} else if (request.getParameter( " action " ).equals( " getConn " )) ... {
if(session.getAttribute("conn")!=null)...{
response.sendRedirect(request.getRequestURL().toString()+"?action=operator");
return;
}
Stringip=request.getParameter("ip");
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
Stringport=request.getParameter("port");

try...{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connectionconn=DriverManager.getConnection("jdbc:microsoft:sqlserver://"+ip+":"+port+";DatabaseName=master",username,password);
session.setAttribute("conn",conn);
response.sendRedirect(request.getRequestURL().toString()+"?action=operator");
}catch(Exceptione)...{
out.println(e.getMessage());
}
} else if (request.getParameter( " action " ).equals( " operator " )) ... {
Connectionconn=(Connection)session.getAttribute("conn");
if(conn!=null)...{
ArrayListdbs=(ArrayList)session.getAttribute("dbs");
try...{
if(dbs==null)...{
PreparedStatementstmt=conn.prepareStatement("selectnamefromsysdatabases");
ResultSetrs=stmt.executeQuery();
dbs=newArrayList();

while(rs.next())...{
dbs.add(rs.getString(1));
}
rs.close();
stmt.close();
session.setAttribute("dbs",dbs);
}
}catch(Exceptione)...{
out.println(e.getMessage());
}
%>
<tablewidth="100%"cellpadding="0"cellspacing="0"border="1">
<tr>
<tdwidth="20%">
选择数据库:
</td>
<tdwidth="80%">

<selectname="database"
onChange="db=this.options[this.selectedIndex].value;changevalue(this)"
id="database">
<%
for(inti=0;i<dbs.size();i++)...{
Stringstr=(String)dbs.get(i);
request.setAttribute("db",str);
%><option$...{db==param.db?"selected":""}value="<%=str%>"><%=str%></option>
<%
}
%>
</select>

<spanstyle="cursor:pointer"onclick="getTables()">查看用户表(要查看系统表请用命令)</span>
<spanonclick="logout()"style="cursor:pointer">退出</span>
</td>
</tr>
<tr>
<td>
SQLCommand:
</td>
<td>
<formaction="?action=operator&cmd=execute"
onsubmit="this.action+='&db='+document.getElementById('database').options[document.getElementById('database').selectedIndex].value"
method="post">
<inputname="sqlcmd"type="text"id="sqlcmd"
value="${emptyparam.sqlcmd?"usemaster;select*from
sysobjects":param.sqlcmd}"size="80">
<inputtype="submit"name="Submit"value="执行">
</form>
</td>
</tr>
<tr>
<tdvalign="top">
结果:
</td>
<td>
<%
if(request.getParameter("cmd")!=null)...{

Stringsql=request.getParameter("sqlcmd");
try...{
Statementstmt=conn.createStatement();
if(stmt.execute(sql))...{
ResultSetrs=stmt.getResultSet();
ResultSetMetaDatadata=rs.getMetaData();

inti=1;
%>
<tablebordercolor="#33CCFF"border="1"cellspacing="0"
cellpadding="0">
<tr>
<%
for(;i<=data.getColumnCount();i++)...{
%>
<th><%=data.getColumnName(i)%></th>
<%
}
%>
</tr>
<%
while(rs.next())...{
out.println("<tr>");
for(i=1;i<=data.getColumnCount();i++)...{
%>
<tdstyle="word-break:break-all">
<%=rs.getString(i)%>
</td>
<%
}
out.println("</tr>");
}

%>
</table>
<%

rs.close();
stmt.close();
}else...{
out.println("命令成功执行!");
}
}catch(Exceptione)...{
out.println(e.getMessage());
}
}else...{
out.println("");
}
%>
</td>
</tr>

</table>
<%
}
} else if (request.getParameter( " action " ).equals( " getTables " )) ... {
Stringdb=request.getParameter("db");
if(db!=null)...{
Connectionconn=(Connection)session.getAttribute("conn");
try...{
Statementstmt=conn.createStatement();
ResultSetrs=stmt.executeQuery("selectnamefrom["+db+"]..sysobjectswherextype='U'andstatus>0");
%>
<table>
<tr>
<th>
表名
</th>
<th>
操作查看数据
</th>
</tr>
<%
while(rs.next())...{
%>
<tr>
<td><%=rs.getString(1)%></td>
<td>
<atarget="_blank"
href="<%=request.getRequestURL().toString()+"?action=deleteTable&db="+db+"&Table="+rs.getString(1)%>">删除</a>
</td>
<td>
<atarget="_blank"
href="<%=request.getRequestURL().toString()+"?action=getContents&db="+db+"&table="+rs.getString(1)%>">查看</a>
</td>
</tr>
<%
}
%>
</table>
<%
rs.close();
stmt.close();
}catch(Exceptione)...{
out.println(e.getMessage());
}
}
} else if (request.getParameter( " action " ).equals( " logout " )) ... {
Connectionconn=(Connection)session.getAttribute("conn");
try...{
conn.close();
session.invalidate();
response.sendRedirect(request.getRequestURL().toString());
}catch(Exceptione)...{
out.println(e.getMessage());
}
} else if (request.getParameter( " action " ).equals( " getContents " )) ... {
Stringdb=request.getParameter("db");
Stringtable=request.getParameter("table");

if(db!=null&&table!=null)...{
try...{
Connectionconn=(Connection)session.getAttribute("conn");
if(conn!=null)...{
Statementstmt=conn.createStatement();
ResultSetrs=stmt.executeQuery("select*from["+db+"]..["+table+"]");
ResultSetMetaDatadata=rs.getMetaData();

out.println("<tableborder=1cellpadding=0cellspacing=0>");
inti=data.getColumnCount();
out.println("<tr>");
for(inta=1;a<=i;a++)...{
out.println("<th>"+data.getColumnName(a)+"</th>");
}
out.println("</tr>");
while(rs.next())...{
out.println("<tr>");
for(inta=0;a<i;a++)...{
out.println("<tdstyle='word-break:break-all'>"+rs.getString(a+1)+"</td>");
}
out.println("</tr>");
}

out.println("</table>");
rs.close();
stmt.close();
}
}catch(Exceptione)...{
out.println(e.getMessage());
}
}
} else if (request.getParameter( " action " ).equals( " deleteTable " )) ... {
try...{
Stringdb=request.getParameter("db");
Stringtable=request.getParameter("Table");
Connectionconn=(Connection)session.getAttribute("conn");
Statementstmt=conn.createStatement();
stmt.executeUpdate("droptable["+db+"]..["+table+"]");
out.println(table+"表已被执行删除操作，请刷新父页面以确认表是否被删除!");
stmt.close();
}catch(Exceptione)...{
out.println(e.getMessage());
}

}
%>
</ body >
</ html >

---

参考来源：
http://hi.baidu.com/breezedancer/blog/item/d4d9612266f657a44723e8e8.html
http://hi.baidu.com/myeking/blog/item/08023734eee78a3f5bb5f5ce.html
http://hi.baidu.com/jspwebdev/blog/item/5320f113d55268d3f6039e22.html
http://blog.csdn.net/PeakLui/archive/2008/01/24/2063588.aspx

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