在java.sql包中,关于Statement和PreparedStatement的区别,描述正确的是()A.Statement负责查询,PreparedStatement负责更新和删除B.Statement在删除数据时效率更高;PreparedStatement是预编译的,对于批量处理可以大大提高效率。C.Statement每次执行一条SQL命令时,都会对它
pstatement = db_connection.prepareStatement(PDSLnPConstants.UPSERT_SQL); for (Entry<Integer, LinkedHashMap<Integer, String>> entry : MAPPING.entrySet()) { pstatement.setInt(1, entry.getKey()); pstatement.setString(2, entry.getValue().get(LnPConstants.CGUID_ID)); pstatement.setString(3,...
A.PreparedStatement继承了StatementB.PreparedStatement可以有效的防止SQL注入C.PreparedStatement只能执行带问号占位符的预编译SQL,不能执行SQL语句D.PreparedStatement可以存储预编译的SQL语句,从而提升执行效率相关知识点: 试题来源: 解析 C.PreparedStatement只能执行带问号占位符的预编译SQL,不能执行SQL语句 反馈...
statement=connection.createStatement();for(inti = 1; i <= 1000; i++) { String query= "INSERT INTO Testing(Id) VALUES(" + 2 * i + ")"; statement.executeUpdate(query); } //耗时 5511MS 2.用prepared statement connection =DriverManager.getConnection(sqlurl, sqluser, sqlpassword); Prepared...
The main feature of a PreparedStatement object is that, unlike a Statement object, it is given a SQL statement when it is created. The advantage to this is that in most cases, this SQL statement is sent to the DBMS right away, where it is compiled. As a result, the PreparedStatement ob...
import java.sql.SQLException; import java.sql.Statement; /** * insert插入 * */ // 第一步不是导入驱动架包了,因为已经导入过了 public class JdbcDemo2 { public static void main(String[] args) { Statement stmt = null; Connection conn = null; ...
>against a MySQL database. When I run this statement in MySQL I >get a returned value: > >SELECT first_name > FROM lytthouse_airlines.passenger > WHERE passenger_id = 1 >; > >but when I run this prepared statement in my java class, it doesn't work: ...
Java 代码,在数据库端,并没有当成 prepared statetment 被处理。 C代码通过libpq 访问数据库端,被当成了 prepared statement 处理。也许是因PostgreSQL对JDBC的支持毕竟是后期出现的: 下面看代码和运行结果: Java 代码: import java.sql.*;publicclassTest01 {publicstaticvoidmain(String argsv[]){try{ ...
final PreparedStatement statement = conn.prepareStatement(sql); // 设置参数 setParameters(statement, params); // 执行查询并获得结果 final ResultSet result = statement.executeQuery(); // 封装返回 return new Iterator<Map<String, Object>>() { ...
Java 代码,在数据库端,并没有当成 prepared statetment 被处理。 C代码通过libpq 访问数据库端,被当成了 prepared statement 处理。也许是因PostgreSQL对JDBC的支持毕竟是后期出现的: 下面看代码和运行结果: Java 代码: import java.sql.*;publicclassTest01 {publicstaticvoidmain(String argsv[]){try{ ...