import java.sql.*
/**
* @功能: 一个JDBC的本地化API连接类,封装了数据 *** 作方法,只用传一个SQL语句即可
* @作者: 李开欢
* @日期: 2007/
*/
public class ConnectionDemo {
/*
* 这里可以将常量全部放入另一个类中,以方便修改
*/
private static Connection conn
private static Statement ps
private static ResultSet rs
private static final String DRIVER = "com.microsoft.jdbc.sqlserver.SQLServerDriver"
private static final String URL = "jdbc:microsoft:sqlserver://localhost:1433DatabaseName=mydb"
private static final String USER ="sa"
private static final String PASS = "sa"
public ConnectionDemo() {
// TODO Auto-generated constructor stub
ConnectionDemo.getConnection()
}
public static Connection getConnection(){
System.out.println("连接中...")
try {
Class.forName(ConnectionDemo.DRIVER)
conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS)
System.out.println("成功连接")
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace()
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
return conn
}
public static Statement getStatement(String sql){
System.out.println("执行SQL语句中...")
try {
ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE)
if(sql.substring(0, 6).equals("select")){
rs = ps.executeQuery(sql)
System.out.println("执行完查询 *** 作,结果已返回ResultSet集合")
}else if(sql.substring(0, 6).equals("delete")){
ps.executeUpdate(sql)
System.out.println("已执行完毕删除 *** 作")
}else if(sql.substring(0, 6).equals("insert")){
ps.executeUpdate(sql)
System.out.println("已执行完毕增加 *** 作")
}else{
ps.executeUpdate(sql)
System.out.println("已执行完毕更新 *** 作")
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
return ps
}
public static ResultSet getResultSet(){
System.out.println("查询结果为:")
return rs
}
public static void closeConnection(){
System.out.println("关闭连接中...")
try {
if (rs != null) {
rs.close()
System.out.println("已关闭ResultSet")
}
if (ps != null) {
ps.close()
System.out.println("已关闭Statement")
}
if (conn != null) {
conn.close()
System.out.println("已关闭Connection")
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
ConnectionDemo.getConnection()
String sql = "delete from type where id = 1"
ConnectionDemo.getStatement(sql)
String sql2 = "insert into type values(1,'教学设备')"
ConnectionDemo.getStatement(sql2)
String sql1 = "select * from type"
ConnectionDemo.getStatement(sql1)
ResultSet rs = ConnectionDemo.getResultSet()
System.out.println("编号 "+"类型")
try {
while(rs.next()){
System.out.print(" "+rs.getInt(1)+" ")
System.out.println(rs.getString(2))
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
ConnectionDemo.closeConnection()
}
}
可以使用jdbc预编译+批量更新，这样的执行效率最高。具体是这样使用的：
循环2000条数据例如数据被装到了一个名叫dataList的List<Map<String,String>>中，那么批量更新就是这样执行的
Map map = null
String data1= ""
String data2 = ""
String sql = insert into biao values(?,?)
PreparedStatement preStmt = conn.prepareStatement(sql)
for(i = 0i<dataList.size()i++){
map = dataList.get(i)
data1=map.get("data1")
data2 = map.get("data2")
preStmt.setString(1,data1)
preStmt.setString(2, data2)
preStmt.addBatch()
}
preStmt.executeBatch()
preStmt.clearBatch()
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