executeUpdate()
时间: 2023-07-14 13:55:35 浏览: 29
`executeUpdate()` 是 `java.sql.Statement` 接口的方法之一,用于执行 SQL 语句并返回受影响的行数。它通常用于执行 INSERT、UPDATE 或 DELETE 等对数据库进行更改操作的 SQL 语句。这个方法返回一个整数,表示执行 SQL 语句后受影响的行数。
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executeupdate
executeUpdate是一个用于执行数据库的更新、插入和删除操作的方法。它返回一个表示受影响的记录行数的整数值。\[1\]与executeQuery方法不同,executeUpdate不能执行查询语句,只能执行更新操作。\[2\]execute方法则兼具executeUpdate和executeQuery的功能,可以执行查询语句并返回结果集。\[3\]所以,如果你需要执行更新、插入或删除操作,并且想知道受影响的记录行数,你应该使用executeUpdate方法。
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executeUpdate
executeUpdate is a method in Java that is used to execute an SQL statement that modifies data in a database. It is commonly used to execute SQL statements such as INSERT, UPDATE, and DELETE.
The executeUpdate method returns an integer value that represents the number of rows that were affected by the SQL statement. If the SQL statement was executed successfully, the return value will be greater than or equal to zero. If an error occurred during the execution of the SQL statement, the method will throw an exception.
Here is an example of using executeUpdate to execute an SQL statement:
```
try {
Statement stmt = conn.createStatement();
String sql = "UPDATE customers SET age = 25 WHERE id = 1";
int rowsUpdated = stmt.executeUpdate(sql);
System.out.println("Rows updated: " + rowsUpdated);
} catch (SQLException e) {
System.out.println("Error executing SQL statement: " + e.getMessage());
}
```
In this example, the SQL statement updates the age of a customer with the ID of 1 to 25. The executeUpdate method is used to execute the SQL statement, and the number of rows that were updated is printed to the console. If an error occurs during the execution of the SQL statement, the catch block will handle the exception and print an error message.