如何仅从Java-MySQL中的表中获取单个结果？
让我们首先创建一个表-
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(101,'Chris'); mysql> insert into DemoTable values(102,'David'); mysql> insert into DemoTable values(103,'Mike');
使用select语句显示表中的所有记录-
mysql> select * from DemoTable;
这将产生以下输出-
+------+-------+ | Id | Name | +------+-------+ | 101 | Chris | | 102 | David | | 103 | Mike | +------+-------+ 3 rows in set (0.00 sec)
现在让我们看一下Java-MySQL代码。这将仅从表顶部获取一条记录-
示例
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mysql.jdbc.ResultSetMetaData;
public class OneResultDemo {
public static void main(String[] args) {
Connection con = null;
PreparedStatement ps = null;
Statement st = null;
ResultSet rs = null;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/web?useSSL=false", "root", "123456");
String query = "select *from DemoTable " + " limit 1";
st = con.createStatement();
rs = st.executeQuery(query);
while (rs.next()) {
System.out.println("Id=" + rs.getInt("Id"));
System.out.println("Name=" + rs.getString("Name"));
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}输出结果
这将产生以下输出-
Id=101 Name=Chris