創立數據庫school

創立表格students

create table students(id INT NOT NULL AUTO_INCREMENT,name VARCHAR(20) NOT NULL,sex VARCHAR(4) NOT NULL,age INT(4) NOT NULL,PRIMARY KEY ( id ) );

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下面是增刪改查的完整代碼

package java_mysql; import java.sql.*;public class main{// JDBC driver name and database URLstatic final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; static final String DB_URL = "jdbc:mysql://127.0.0.1/school";// Database credentialsstatic final String USER = "root";static final String PASS = "appleyuchi";public static void main(String[] args) {Connection conn = null;Statement stmt = null;try{//STEP 2: Register JDBC driverClass.forName("com.mysql.jdbc.Driver");//STEP 3: Open a connectionSystem.out.println("Connecting to a selected database...");conn = DriverManager.getConnection(DB_URL, USER, PASS);System.out.println("Connected database successfully...");//STEP 4: Execute a query //---------------------------下面是增操作----------------------------------------------------------- stmt = conn.createStatement(); // // String sql = "INSERT INTO students (name,sex,age)" + // "VALUES ('Ender','male',8)"; // stmt.executeUpdate(sql); // sql = "INSERT INTO students (name,sex,age)" + // "VALUES ('Bean','male',7)"; // stmt.executeUpdate(sql); // sql = "INSERT INTO students (name,sex,age)" + // "VALUES ('Petra', 'Fema',9)"; // stmt.executeUpdate(sql); // sql = "INSERT INTO students (name,sex,age)" + // "VALUES('God','fema',232)"; // stmt.executeUpdate(sql); // System.out.println("Inserted records into the table...");//---------------------------下面是刪操作------------------------------------------- // String name="Petra"; // String sql = "delete from students where Name='" + name + "'"; // stmt.executeUpdate(sql);//---------------------------下面是改操作------------------------------------------- // int age=78; // String name="God"; // String sql = "update students set Age='" + age + "' where Name='" + name + "'"; // stmt.executeUpdate(sql);//---------------------------下面是查操作------------------------------------------- int age=8;String sql="select * from students where age='"+age+"'";ResultSet rs=stmt.executeQuery(sql);//執行查詢該表while(rs.next()){int id=rs.getInt(1);String name=rs.getString(2);String sex=rs.getString(3);System.out.println(id+","+name+","+sex);}}catch(SQLException se){//Handle errors for JDBCse.printStackTrace();}catch(Exception e){//Handle errors for Class.forNamee.printStackTrace();}finally{//finally block used to close resourcestry{if(stmt!=null)conn.close();}catch(SQLException se){}// do nothingtry{if(conn!=null)conn.close();}catch(SQLException se){se.printStackTrace();}//end finally try}//end trySystem.out.println("Goodbye!"); }//end main }//end JDBCExample

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