Special conversion cases

Conversion of string literals

Teiid Spring Boot automatically converts string literals within a SQL statement to their implied types. This typically occurs in a criteria comparison where an expression with a different datatype is compared to a literal string. For example:

SELECT * FROM my.table WHERE created_by = '2016-01-02'

In the preceding example, if the created_by column has the data type of date, Teiid Spring Boot automatically converts the data type of the string literal to a date.

Converting to Boolean

Teiid Spring Boot can automatically convert literal strings and numeric type values to Boolean values as shwon in the following table:

Table 1. Boolean conversions
Type Literal value Boolean value

String

'false'

false

'unknown'

null

other

true

Numeric

0

false

other

true
Date and time conversions

Teiid Spring Boot can implicitly convert properly formatted literal strings to their associated date-related data types as shown in the following table:

Table 2. Date and time conversions
String literal format Possible implicit conversion type

yyyy-mm-dd

DATE

hh:mm:ss

TIME

yyyy-mm-dd[ hh:mm:ss.[fff…]]

TIMESTAMP

The preceding formats are those expected by the JDBC date types. For information about using other formats, see the functions PARSEDATE, PARSETIME, and PARSETIMESTAMP in Date and time functions.

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