public class JDBCDemo2_Statement {
@Test
public void testDML() throws Exception {
//DML是指对数据内容进行修改,对数据的增删改
String url = "jdbc:mysql:///test230615?useSSL=false";
String username = "";
String password = "";
Connection connection = DriverManager.getConnection(url, username, password);
String sql = "update account set money = 1000 where id = 1";
Statement statement = connection.createStatement();
int count = statement.executeUpdate(sql);
if (count>0){
//count表示受影响的行数,若为0则表示修改失败
System.out.println("修改成功!");
}else {
System.out.println("修改失败!");
}
connection.close();
statement.close();
}
@Test
public void testDDL() throws Exception {
//DDL是指对表和库的增删改查
String url = "jdbc:mysql:///test230615?useSSL=false";
String username = "";
String password = "";
Connection connection = DriverManager.getConnection(url, username, password);
String sql = "create database db";
Statement statement = connection.createStatement();
int count = statement.executeUpdate(sql);
System.out.println(count);
connection.close();
statement.close();
}
}
JDBC statement
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