java连接oracle数据库

java连接oracle数据库

装载驱动程序

Class.forName( "oracle.jdbc.driver.OracleDriver");

建立连接

Connectionconn= DriverManager.getConnection(DB_URL,DB_USERNAME,DB_PASSWORD);

创建对象

Statement st = conn.createStatement();

执行语句并返回结果

st.executeUpdate("SQL statement")

ResultSet rs = st.executeQuery("SELECT a, b, c FROM Table1");

while (rs.next()) {

int x = rs.getInt("a");

String s = rs.getString("b");

float f = rs.getFloat("c");

}

注意：

By default, only one ResultSet object per Statement object can be open at the same time. 

Therefore, if the reading of one ResultSet object is interleaved with the reading of another, each must have been generated by differentStatement objects. 

All execution methods in the Statement interface implicitly close a statment's currentResultSet object if an open one exists.

关闭数据库连接

st.close()

conn.close()

package dbconnection;


import java.sql.*;




public class main {
                                          
    
    /** Oracle数据库连接驱动*/
    private final static String DB_DRIVER = "oracle.jdbc.driver.OracleDriver";
    
    /** Oracle数据库连接URL*/
    private final static String DB_URL = "jdbc:oracle:thin:@10.240.70.85:1521:inms";


    
    /** 数据库用户名*/
    private final static String DB_USERNAME = "NM31228b1226";
    
    /** 数据库密码*/
    private final static String DB_PASSWORD = "NM31228b1226";
    





/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

        /** 声明Connection连接对象*/
        Connection conn = null;
        
        try{
            /** 使用Class.forName()方法自动创建这个驱动程序的实例且自动调用DriverManager来注册它*/
        Class.forName(DB_DRIVER);
       
            /** 通过DriverManager的getConnection()方法获取数据库连接*/
            conn = DriverManager.getConnection(DB_URL,DB_USERNAME,DB_PASSWORD);
        }catch(Exception ex){
            ex.printStackTrace();
        }
        try{
        Statement stmt = conn.createStatement();
        String SelectICONMAP = "SELECT typename,iconname FROM UT_ICONMAP";
        ResultSet rs = stmt.executeQuery(SelectICONMAP);
       
        while (rs.next()) {
        String TypeName = rs.getString("typename");
        String IconName = rs.getString("iconname");
        System.out.print(TypeName + ":"+IconName+"\n");
        }
       
        stmt.close();
        conn.close();
        }catch(Exception ex){
        ex.printStackTrace();
        }
        

}


}