JDBC (未)
时间：2021-07-01 10:21:17
帮助过：6人阅读
import java.sql.*
;
public class FirstExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"
;
static final String DB_URL = "jdbc:mysql://localhost/EMP"
;
// Database credentials
static final String USER = "username"
;
static final String PASS = "password"
;
public static void main(String[] args) {
Connection conn =
null;
Statement stmt =
null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver"
);
//STEP 3: Open a connection
System.out.println("Connecting to database..."
);
conn =
DriverManager.getConnection(DB_URL,USER,PASS);
//STEP 4: Execute a query
System.out.println("Creating statement..."
);
stmt =
conn.createStatement();
String sql;
sql = "SELECT id, first, last, age FROM Employees"
;
ResultSet rs =
stmt.executeQuery(sql);
//STEP 5: Extract data from result set
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("id"
);
int age = rs.getInt("age"
);
String first = rs.getString("first"
);
String last = rs.getString("last"
);
//Display values
System.out.print("ID: " +
id);
System.out.print(", Age: " +
age);
System.out.print(", First: " +
first);
System.out.println(", Last: " +
last);
}
//STEP 6: Clean-up environment
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=
null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=
null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}
//end try
System.out.println("Goodbye!"
);
}//end main
}
//end FirstExample
View Code
数据库连接池
dbcp
c3p0
JDBC升级替代品
commons-dbutils
hibernate
mybatis
参考资料：
[0] 慕课网视频：JDBC http://www.imooc.com/learn/157 http://www.imooc.com/learn/421
[1] JDBC教程：http://www.yiibai.com/jdbc/
待补充：例子代码 和理解
JDBC (未)
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