1、創(chuàng)建properties文件

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#oracle
#driver=oracle.jdbc.OracleDriver
#url=jdbc\:oracle\:thin\:@localhost\:1521\:xe
#username=system
#password=manager

#mysql
driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://192.168.0.121\:3306/test?user\=root&password\=root&characterEncoding\=utf8
username=root
password=root
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2、創(chuàng)建鏈接數(shù)據(jù)庫類

public class JdbcConnect {
? ? ? ? private static Properties prop = new Properties();
?? ? ? ?static{
?? ? ? ??? ? ?
?? ? ? ??? ? ?try {
?? ? ? ??? ? ? ?//Properties prop = new Properties();
?? ??? ??? ??? ?prop.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("jdbc.properties"));
?? ??? ??? ? ? ?Class.forName(prop.getProperty("driver"));
?? ??? ??? ??? ?//Class.forName(prop.getProperty("mysqlDriver"));
?? ? ? ??? ? ?} catch (Exception e) {
?? ??? ??? ??? ?// TODO Auto-generated catch block
?? ? ? ??? ??? ?System.out.println("Error");
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?}
?? ? ? ??? ??
?? ? ? ?}
?? ? ? ?
?? ? ? ?
?? ? ? ?public static Connection getConn(){
?? ? ? ? ? ?Connection conn =null;
?? ??? ? ? ?try {
?? ??? ? ? ??? ?//Oracle
?? ??? ? ? ? ??? ?conn = DriverManager.getConnection(prop.getProperty("url"),
?? ??? ??? ? ? ?prop.getProperty("username"),prop.getProperty("password"));
?? ??? ? ? ??? ?//Mysql
?? ??? ? ? ??? ?//conn = DriverManager.getConnection(prop.getProperty("mysqlUrl"));
?? ??? ? ? ??? ?//System.out.println(conn);
?? ??? ? ? ?} catch (SQLException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?}finally{
?? ??? ??? ?
?? ??? ?}
?? ? ? ? return conn; ??
?? ??? ? ??
?? ? ? ??? ?
?? ? ? ?}
?? ? ? ?
?? ? ? ?
?? ? ? ?public static void ?close(Connection conn,PreparedStatement pstmt,ResultSet rs){
?? ? ? ??? ? try {
?? ??? ??? ??? ? if(pstmt != null)
?? ??? ??? ??? ??? ? pstmt.close();
?? ??? ??? ??? ? if(rs != null)
?? ??? ??? ??? ??? ? rs.close();
?? ??? ??? ??? ? if(conn != null)
?? ??? ??? ??? ??? ? conn.close();
?? ??? ??? ?} catch (Exception e) {
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ??? ?// TODO: handle exception
?? ??? ??? ?}
?? ? ? ??? ??
?? ? ? ?}
//?? ? ? ?public static void main(String[] args) {
//?? ??? ??? ? new JdbcConnect().getConn();
//?? ??? ?}
}
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3、測試訪問數(shù)據(jù)庫

初始化

? ? private ?Connection conn = null;
? ? private ?PreparedStatement pstmt = null;
? ? private ?ResultSet ?rs = null;

訪問

?? ?//查詢總記錄
?? ?public int queryCount() {
?? ??? ?int count =0;
?? ??? ?try {
?? ??? ??? ?conn = MyJdbcConnect.getConn();
//?? ??? ??? ?pstmt = conn.prepareStatement("select count(*) from student");
?? ??? ??? ?pstmt = conn.prepareStatement("select max(age) as avgvalue from userinfodz");
?? ??? ??? ?rs = pstmt.executeQuery();
?? ??? ??? ?if(rs.next()){
?? ??? ??? ??? ? count = rs.getInt(1);
?? ??? ??? ?}
?? ??? ?} catch (Exception e) {
?? ??? ??? ?// TODO: handle exception
?? ??? ??? ?e.printStackTrace();
?? ??? ?}finally{
?? ??? ??? ?MyJdbcConnect.close(conn, pstmt, rs);
?? ??? ?}
?? ??? ?return count;
?? ?}

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附：

public interface SQLSentence {
? ? ? ? ? ?String oinsert="insert into mytable values(mytab_seq.nextval,?,?,?,?,?)";
? ? ? ? ? ?String minsert="insert into mytable values(null,?,?,?,?,?)";
? ? ? ? ? ?String update="update mytable ?t set t.myname=? ,t.myage=?,t.myhobby =?,t.myinfo=? where t.myid=?";
? ? ? ? ? ?String delete="delete from mytable where myid=?";
? ? ? ? ? ?String qcount="select count(*) from mytable";
? ? ? ? ? ?String Pagingfororacle="select * from(select T.*,ROWNUM RN from MyTable T where ROWNUM<=? order by T.myid) where RN>=?";
? ? ? ? ? ?String Pagingformysql=" select * from mytable limit ? , ?";
? ? ? ? ? ?String PagingforOracle2 = "select * from(select T.*,ROWNUM RN from MyTable T order by T.myid) where RN between ? and ?";
? ? ? ? ? ?String GetMyTableById = "select * from mytable where myid = ?";?
? ? ? ? ? ?
}
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