MySQL - IN 运算符

要在JavaScript程序中通过MySQL表使用IN运算符，我们需要使用mysql2连接器提供的名为query()的函数执行带有IN的SQL语句。

sql= "SELECT columns FROM table_name 
WHERE column_name IN (value1, value2, value3, ...)";  
con.query(sql);

要在Java程序中通过MySQL表使用IN运算符，我们需要使用JDBC类型4驱动程序提供的名为executeQuery()的函数执行带有IN的SQL语句。

String sql = "SELECT COLUMN(S) FROM TABLE_NAME 
WHERE COLUMN_NAME IN(VALUE1, VALUE2, VALUE3,...)";
statement.executeQuery(sql);

要在Python程序中通过MySQL表使用IN运算符，我们需要使用MySQL Connector/Python提供的名为execute()的函数执行带有IN的SQL语句。

in_query = "SELECT column1, column2, ... FROM table_name 
WHERE column_name IN (value1, value2, value3, ...)"
cursorObj.execute(in_query);

var mysql = require('mysql2');
var con = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "Nr5a0204@123"
});

  //Connecting to MySQL
  con.connect(function (err) {
  if (err) throw err;
  console.log("Connected!");
  console.log("--------------------------");

  //Creating a Database
  sql = "create database TUTORIALS"
  con.query(sql);

  //Select database
  sql = "USE TUTORIALS"
  con.query(sql);

  //Creating table
  sql = "CREATE TABLE IF NOT EXISTS employee_tbl(id INT NOT NULL, name VARCHAR(100) NOT NULL, work_date DATE, daily_typing_pages INT);"
  con.query(sql);

  //Inserting Records
  sql = "INSERT INTO employee_tbl(id, name, work_date, daily_typing_pages) VALUES(1, 'John', '2007-01-24', 250), (2, 'Ram', '2007-05-27', 220), (3, 'Jack', '2007-05-06', 170), (3, 'Jack', '2007-04-06', 100), (4, 'Jill', '2007-04-06', 220),(5, 'Zara', '2007-06-06', 300),(5, 'Zara', '2007-02-06', 350);"
  con.query(sql);

  //Using IN Operator
  sql = "SELECT * FROM employee_tbl WHERE daily_typing_pages IN ( 250, 220, 170 );"
  con.query(sql, function(err, result){
    if (err) throw err
    console.log(result)
  });
});    

输出

生成的输出如下：

Connected!
--------------------------
[
  {
    id: 1,
    name: 'John',
    work_date: 2007-01-23T18:30:00.000Z,
    daily_typing_pages: 250
  },
  {
    id: 2,
    name: 'Ram',
    work_date: 2007-05-26T18:30:00.000Z,
    daily_typing_pages: 220
  },
  {
    id: 3,
    name: 'Jack',
    work_date: 2007-05-05T18:30:00.000Z,
    daily_typing_pages: 170
  },
  {
    id: 4,
    name: 'Jill',
    work_date: 2007-04-05T18:30:00.000Z,
    daily_typing_pages: 220
  }
]      

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class InOperator {
    public static void main(String[] args) {
        String url = "jdbc:mysql://127.0.0.1:3306/TUTORIALS";
        String user = "root";
        String password = "password";
        ResultSet rs;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            Connection con = DriverManager.getConnection(url, user, password);
            Statement st = con.createStatement();
            //System.out.println("Database connected successfully...!");
            String sql = "CREATE TABLE CUSTOMERS ( ID INT NOT NULL, NAME VARCHAR (20) NOT NULL, AGE INT NOT NULL, ADDRESS CHAR (25), SALARY DECIMAL (18, 2), PRIMARY KEY (ID))";
            st.execute(sql);
            System.out.println("Table created successfully...!");
            //now lets insert some records
            String sql1 = "INSERT INTO CUSTOMERS VALUES (1, 'Ramesh', 32, 'Ahmedabad', 2000.00 ), (2, 'Khilan', 25, 'Delhi', 1500.00 ), (3, 'kaushik', 23, 'Kota', 2000.00 ), (4, 'Chaitali', 25, 'Mumbai', 6500.00 ), (5, 'Hardik', 27, 'Bhopal', 8500.00 ), (6, 'Komal', 22, 'MP', 4500.00 ), (7, 'Muffy', 24, 'Indore', 10000.00 )";
            st.execute(sql1);
            System.out.println("Records inserted successfully....!");
            //display records
            String sql2 = "SELECT * FROM CUSTOMERS";
            rs = st.executeQuery(sql2);
            System.out.println("Table records before update: ");
            while(rs.next()) {
                String id = rs.getString("Id");
                String name = rs.getString("Name");
                String age = rs.getString("Age");
                String address = rs.getString("Address");
                String salary = rs.getString("Salary");
                System.out.println("Id: " + id + ", Name: " + name + ", Age: " + age + ", Addresss: " + address + ", Salary: " + salary);
            }
            //let use IN operator with where clause to update records
            String sql3 = "UPDATE CUSTOMERS SET AGE = 30 WHERE AGE IN (25, 27)";
            st.executeUpdate(sql3);
            //display table records after update
            String sql4 = "SELECT * FROM CUSTOMERS";
            rs = st.executeQuery(sql4);
            System.out.println("Table records before update: ");
            while(rs.next()) {
                String id = rs.getString("Id");
                String name = rs.getString("Name");
                String age = rs.getString("Age");
                String address = rs.getString("Address");
                String salary = rs.getString("Salary");
                System.out.println("Id: " + id + ", Name: " + name + ", Age: " + age + ", Addresss: " + address + ", Salary: " + salary);
            }
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}                                     

输出

获得的输出如下所示：

Table created successfully...!
Records inserted successfully....!
Table records before update: 
Id: 1, Name: Ramesh, Age: 32, Addresss: Ahmedabad, Salary: 2000.00
Id: 2, Name: Khilan, Age: 25, Addresss: Delhi, Salary: 1500.00
Id: 3, Name: kaushik, Age: 23, Addresss: Kota, Salary: 2000.00
Id: 4, Name: Chaitali, Age: 25, Addresss: Mumbai, Salary: 6500.00
Id: 5, Name: Hardik, Age: 27, Addresss: Bhopal, Salary: 8500.00
Id: 6, Name: Komal, Age: 22, Addresss: MP, Salary: 4500.00
Id: 7, Name: Muffy, Age: 24, Addresss: Indore, Salary: 10000.00
Table records before update: 
Id: 1, Name: Ramesh, Age: 32, Addresss: Ahmedabad, Salary: 2000.00
Id: 2, Name: Khilan, Age: 30, Addresss: Delhi, Salary: 1500.00
Id: 3, Name: kaushik, Age: 23, Addresss: Kota, Salary: 2000.00
Id: 4, Name: Chaitali, Age: 30, Addresss: Mumbai, Salary: 6500.00
Id: 5, Name: Hardik, Age: 30, Addresss: Bhopal, Salary: 8500.00
Id: 6, Name: Komal, Age: 22, Addresss: MP, Salary: 4500.00
Id: 7, Name: Muffy, Age: 24, Addresss: Indore, Salary: 10000.00          

import mysql.connector
#establishing the connection
connection = mysql.connector.connect(
    host='localhost',
    user='root',
    password='password',
    database='tut'
)
# Creating a cursor object 
cursorObj = connection.cursor()
in_query = f"""SELECT * FROM customers
WHERE id IN (2, 4, 6)"""
cursorObj.execute(in_query)
# Fetching all rows that meet the criteria
filtered_rows = cursorObj.fetchall()
for row in filtered_rows:
    print(row)
cursorObj.close()
connection.close()                                   

输出

以下是上述代码的输出：

(2, 'Khilan', 25, 'Kerala', Decimal('8000.00'))
(4, 'Chaital', 25, 'Mumbai', Decimal('1200.00'))
(6, 'Komal', 29, 'Vishakapatnam', Decimal('7000.00'))