时间：2021-07-01 10:21:17 帮助过：23人阅读
一，链接 mysql: Class. forName ( "com.mysql.jdbc.Driver" ); Connection conn = DriverManager . getConnection ( "jdbc:mysql://localhost/mydata?user=rootpassword=6656565" ); Statement stmt = conn.createStatement(); ResultSet rs = stmt.execute
一，链接mysql:
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager .getConnection("jdbc:mysql://localhost/mydata?user=root&password=6656565");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from dept");
例子：
import java.sql.*;
publicclass TestMySqlConnect {
publicstaticvoid main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager
.getConnection("jdbc:mysql://localhost/mydata?user=root&password=6656565");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from dept");
while (rs.next()) {
System.out.println(rs.getString("deptno"));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null) {
conn.close();conn = null;
}
if (stmt != null) {
stmt.close();stmt = null;
}
if (rs != null) {
rs.close();rs = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
二，链接access
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager .getConnection("jdbc:odbc:TestConnectToJava");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from guest");
例子：
import java.io.*;
import java.sql.*;
publicclass TestAccessConnect
{
publicstaticvoid main(String[] args)
{
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn=DriverManager.getConnection("jdbc:odbc:TestConnectToJava");
stmt=conn.createStatement();
rs=stmt.executeQuery("select * from guest");
while (rs.next()){
System.out.println(rs.getString("content"));
}
} catch (ClassNotFoundException e){
e.printStackTrace();
} catch(SQLException e){
e.printStackTrace();
} finally{
try {
if (rs != null) {
rs.close();rs = null;
}
if (stmt != null) {
stmt.close();stmt = null;
}
if (conn != null) {
conn.close();conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
三，链接oracle
Class.forName("oracle.jdbc.driver.OracleDriver");
conn=DriverManager
.getConnection("jdbc:oracle:thin:@192.168.1.103:1521:ORCL",user,password);
stmt=conn.createStatement();
rs=stmt.executeQuery("select * from emp");
例子：
import java.sql.*;
publicclass TestOracleConnect {
publicstaticvoid main(String [] args){
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn=DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.103:1521:ORCL","huanran","huanran");
stmt=conn.createStatement();
rs=stmt.executeQuery("select * from emp");
while (rs.next()){
System.out.println(rs.getString("ename"));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e){
e.printStackTrace();
} finally {
try{
if (rs != null){
rs.close();rs=null;
}
if (stmt != null){
stmt.close();stmt=null;
}
if (conn!=null){
conn.close();conn=null;
}
} catch (SQLException e){
e.printStackTrace();
}
}
}
}