Java——jdbc工具类抽取

CRUD 增删改查——Statement
CRUD 增删改查——PrepareStatement

一、CRUD 增删改查——Statement

public class MainText {
	public static void main(String[] args) {
		
		try {
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/数据库名?useSSL=false", "用户名", "密码");
			Statement statement = conn.createStatement();
			String sql = "select * from teacher where name = '陈老师'";
			ResultSet rs = statement.executeQuery(sql);
			while(rs.next()) {
				System.out.println(rs.getString("name")+rs.getInt("phone"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

二、CRUD 增删改查——PrepareStatement

public class MainText {
	public static void main(String[] args) {
		
		try {
			Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/数据库名?useSSL=false", "用户名", "密码");
			String sql = "select * from teacher where name = ?";
			PreparedStatement ps = conn.prepareStatement(sql);
			ps.setString(1, "陈老师");
			ResultSet rs = ps.executeQuery();
			while(rs.next()) {
				System.out.println(rs.getString("name")+" "+rs.getInt("phone"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

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