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| package com.plume.api.preparedstatement;
import org.junit.Test;
import java.sql.*; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;
public class PSCURDPart {
@Test public void testInsert() throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.cj.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql:///pass", "root", "123456"); String sql = "INSERT into information(name,password,phone) values(?,?,?)"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setObject(1,"test"); preparedStatement.setObject(2,"test"); preparedStatement.setObject(3,"12345678"); int rows = preparedStatement.executeUpdate(); if (rows > 0){ System.out.println("数据插入成功!"); }else{ System.out.println("数据插入失败!"); } preparedStatement.close(); connection.close();
}
@Test public void testUpdate() throws ClassNotFoundException, SQLException { Class.forName("com.mysql.cj.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql:///pass", "root", "123456"); String sql = "UPDATE information SET name =? WHERE id =?"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setObject(1,"灰羽"); preparedStatement.setObject(2,1234); int update = preparedStatement.executeUpdate(); if(update > 0){ System.out.println("修改成功!"); }else{ System.out.println("修改失败!"); } preparedStatement.close(); connection.close();
}
@Test public void testDelete() throws ClassNotFoundException, SQLException { Class.forName("com.mysql.cj.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql:///pass", "root", "123456"); String sql = "DELETE FROM information WHERE id =?"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setObject(1,349314787); int update = preparedStatement.executeUpdate(); if(update > 0){ System.out.println("删除成功!"); }else{ System.out.println("删除失败!"); } preparedStatement.close(); connection.close();
}
@Test public void testSelect() throws ClassNotFoundException, SQLException { Class.forName("com.mysql.cj.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql:///pass", "root", "123456"); String sql = "SELECT id,name,password,phone FROM information"; PreparedStatement preparedStatement = connection.prepareStatement(sql); ResultSet resultSet = preparedStatement.executeQuery();
List<Map> list = new ArrayList<>();
ResultSetMetaData metaData = resultSet.getMetaData(); int columnCount = metaData.getColumnCount();
while(resultSet.next()){ Map map = new HashMap();
for (int i = 1; i <= columnCount; i++) { Object value = resultSet.getObject(i);
String columnLabel = metaData.getColumnLabel(i); map.put(columnLabel, value); }
list.add(map); } System.out.println("list = "+ list); resultSet.close(); preparedStatement.close(); connection.close(); } }
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