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法律研究在 JDBC 中，execute()、executeQuery() 和 executeUpdate() 方法之间有什么区别？
创建 Statement 对象后，您可以使用 Statement 接口的 execute 方法之一来执行它，这些方法分别是 execute()、executeUpdate() 和 executeQuery()。
execute() 方法：此方法用于执行 SQL DDL 语句，它返回一个布尔值，指定是否可以检索 ResultSet 对象。
示例
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class Example {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql:///sampleDB";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating the Statement
Statement stmt = con.createStatement();
//Executing the statement
String createTable = "CREATE TABLE Employee( "
+ "Name VARCHAR(255), "
+ "Salary INT NOT NULL, "
+ "Location VARCHAR(255))";
boolean bool = stmt.execute(createTable);
System.out.println(bool);
}
}输出
Connection established...... false
executeUpdate()：此方法用于执行诸如插入、更新、删除之类的语句。它返回一个整数值，表示受影响的行数。
示例
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class ExecuteUpdateExample {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql:///sampleDB";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating the Statement
Statement stmt = con.createStatement();
String insertData = "INSERT INTO Employee("
+ "Name, Salary, Location) VALUES "
+ "('Amit', 30000, 'Hyderabad'), "
+ "('Kalyan', 40000, 'Vishakhapatnam'), "
+ "('Renuka', 50000, 'Delhi'), "
+ "('Archana', 15000, 'Mumbai')";
int i = stmt.executeUpdate(insertData);
System.out.println("Rows inserted: "+i);
}
}输出
Connection established...... Rows inserted: 4
executeQuery()：此方法用于执行返回表格数据的语句（例如 select）。它返回 ResultSet 类的对象。
示例
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class ExecuteQueryExample {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql:///sampleDB";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating the Statement
Statement stmt = con.createStatement();
//Retrieving data
ResultSet rs = stmt.executeQuery("Select *from Employee");
while(rs.next()) {
System.out.print("Name: "+rs.getString("Name")+", ");
System.out.print("Salary: "+rs.getInt("Salary")+", ");
System.out.print("City: "+rs.getString("Location"));
System.out.println();
}
}
}输出
Connection established...... Name: Amit, Salary: 30000, City: Hyderabad Name: Kalyan, Salary: 40000, City: Vishakhapatnam Name: Renuka, Salary: 50000, City: Delhi Name: Archana, Salary: 15000, City: Mumbai
更新于： 2019年7月30日
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