Mysql cast boolean to string

Questions : How can I cast a string into a boolean in mysql query

2022-09-21T11:15:00+00:00 2022-09-21T11:15:00+00:00

897

In MSSQL query there is the following line, anycodings_mysql resulted in a boolean

   IS_IDENTITY = COLUMNPROPERTY(OBJECT_ID('#attributes.table#'), 
   INFORMATION_SCHEMA.COLUMNS.COLUMN_NAME, 'IsIdentity')

in MYsql, I can only use subquery, but it anycodings_mysql ends in a string.

(SELECT COLUMN_NAME INFORMATION_SCHEMA.COLUMNS.KEY_COLUMN_USAGE.CONSTRAINTS_NAME = "PRIMARY") AS RESULT

How can I cast the "RESULT" into a boolean anycodings_mysql from a string in a mysql query?

Thanks.

Total Answers 3

30

Answers 1 : of How can I cast a string into a boolean in mysql query

The CASE Statement could be what you are anycodings_mysql looking for, but this is just a guess. anycodings_mysql Could you try to reformulate your anycodings_mysql question so it gets a bit more anycodings_mysql understandable what you are doing and anycodings_mysql what your use case is?

0

2022-09-21T11:15:00+00:00 2022-09-21T11:15:00+00:00Answer Link

mRahman

4

Answers 2 : of How can I cast a string into a boolean in mysql query

Try to cast it to tinyINT(1). This is anycodings_mysql equivalent to boolean.

0

2022-09-21T11:15:00+00:00 2022-09-21T11:15:00+00:00Answer Link

jidam

4

Answers 3 : of How can I cast a string into a boolean in mysql query

MySQL does not have a function like SQL anycodings_mysql Server's COLUMNPROPERTY, but you can anycodings_mysql create your own:

delimiter $$
create function f_column_property( 
in_db varchar(64), 
in_table varchar(64), 
in_column varchar(64),
in_constraint_name  varchar(64)
)
returns boolean
begin

declare v_cnt int;

select count(*) into v_cnt
from INFORMATION_SCHEMA.KEY_COLUMN_USAGE 
where TABLE_SCHEMA=in_db and TABLE_NAME=in_table and COLUMN_NAME=in_column 
  and CONSTRAINT_NAME=in_constraint_name;

if (v_cnt>0) then 
  return true;
else 
  return false;
end if;

end
$$

And then use it in a query:

select f_column_property('mydb', 'mytable', 'mycolumn', 'PRIMARY') as 'is_identity'

See documentation.

0

2022-09-21T11:15:00+00:00 2022-09-21T11:15:00+00:00Answer Link

jidam

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Convert TinyInt to Boolean MySQL has now become a simple process. Bobcares, as a part of our MySQL Support Services offers solutions to every MySQL queries that comes our way.

Convert TinyInt To Boolean In MySQL

A TINYINT is an 8-bit integer value, a BIT field can store between 1 bit, BIT(1), and 64 bits, BIT(64). For boolean values, BIT(1) is pretty common. TINYINT uses 1 byte of storage and is the smallest integer data type. (1) in the Tinyint(1) is for formatting options, which are typically ignored. It would be irrelevant if we created it as tinyint(100).

While determining whether something is TRUE or FALSE, any int (int, tinyint, smallint, bigint) value converts to a boolean value. If it’s 0, it’s considered FALSE; if not, it’s considered TRUE. So, 2 is also TRUE here. BOOL, BOOLEAN are synonyms for TINYINT(1).

mysql> SELECT IF(0, 'true', 'false');
+------------------------+
| IF(0, 'true', 'false') |
+------------------------+
| false |
+------------------------+

mysql> SELECT IF(1, 'true', 'false');
+------------------------+
| IF(1, 'true', 'false') |
+------------------------+
| true |
+------------------------+

mysql> SELECT IF(2, 'true', 'false');
+------------------------+
| IF(2, 'true', 'false') |
+------------------------+
| true |
+------------------------+

However, as shown here, the values TRUE and FALSE are merely aliases for 1 and 0, respectively.

mysql> SELECT IF(0 = FALSE, 'true', 'false');
+--------------------------------+
| IF(0 = FALSE, 'true', 'false') |
+--------------------------------+
| true |
+--------------------------------+

mysql> SELECT IF(1 = TRUE, 'true', 'false');
+-------------------------------+
| IF(1 = TRUE, 'true', 'false') |
+-------------------------------+
| true |
+-------------------------------+

mysql> SELECT IF(2 = TRUE, 'true', 'false');
+-------------------------------+
| IF(2 = TRUE, 'true', 'false') |
+-------------------------------+
| false |
+-------------------------------+

mysql> SELECT IF(2 = FALSE, 'true', 'false');
+--------------------------------+
| IF(2 = FALSE, 'true', 'false') |
+--------------------------------+
| false |
+--------------------------------+

Tinyint(1) in MySQL is the equivalent of boolean. Although it can store values between -127 and 127, by default, SQL Runner will display the values as “true” for non-zero values and “false” for zero values.

How To Convert TinyInt To Boolean In MySQL?

1. By using a cast:

   SELECT cast(tiny_int_value as signed) FROM table

2. Another way is by updating the database connection. Then add this as an additional parameter:

   tinyInt1isBit=false

[Looking for a solution to another query? We are available 24/7.]

Conclusion

In this article, our skilled Support Engineers at Bobcares took us through converting tinyint to boolean in MySQL.

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