Node.jsMySQL Drop Table
Delete a Table
You can delete an existing table by using the "DROP TABLE" statement:
Example
Delete the table "customers":
let con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword",
database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
let sql = "DROP TABLE customers";
con.query(sql, function (err, result) {
if (err) throw err;
console.log("Table deleted");
});
});
Save the code above in a file called "demo_db_drop_table.js" and run the file:
Run "demo_db_drop_table.js"
Which will give you this result:
Drop Only if Exist
If the the table you want to delete is already deleted, or for any other reason does not exist, you can use the IF EXISTS keyword to avoid getting an error.
Example
Delete the table "customers" if it exists:
let con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword",
database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
let sql = "DROP TABLE IF EXISTS customers";
con.query(sql, function (err, result) {
if (err) throw err;
console.log(result);
});
});
Save the code above in a file called "demo_db_drop_table_if.js" and run the file:
Run "demo_db_drop_table_if.js"
If the table exist, the result object will look like this:
fieldCount: 0,
affectedRows: 0,
insertId: 0,
serverstatus: 2,
warningCount: 0,
message: '',
protocol41: true,
changedRows: 0
}
If the table does not exist, the result object will look like this:
fieldCount: 0,
affectedRows: 0,
insertId: 0,
serverstatus: 2,
warningCount: 1,
message: '',
protocol41: true,
changedRows: 0
}
As you can see the only differnce is that the warningCount property is set to 1 if the table does not exist.
