Dwight Emmons wrote: > I am upgrading from Postgres 7.2 to 8.1. We can convert int to String in java using String.valueOf() and Integer.toString() methods. PostgreSQL supports a CAST operator that is used to convert a value of one type to another.. Syntax: CAST ( expression AS target_type ); Let’s analyze the above syntax: First, specify an expression that can be a constant, a table column, an expression that evaluates to a value. It is generally used if we have to display number in textfield because everything is displayed as a string in form. 9.8. Table 9-20 lists them. Alternatively, we can use String.format() method, string concatenation operator etc.. It is not financially feasible for us to modify all the > instances. Let's take a look. The DB2, Oracle, MySQL and PostgreSQL provide a function named TO_CHAR() that has a similar feature to the CAST function. Try this: SELECT * FROM table WHERE myint = mytext::int8 The :: cast operator is historical but convenient. The syntax for the to_char function in PostgreSQL is: to_char( value, format_mask ) Parameters or Arguments value The number, date that will be converted to a string. This is followed by using the “AS” keyword. Table 9-21 lists them. format_mask. myint = cast ( mytext as int8) You could also create your own conversion function, inside which you can use exception blocks:. Because the number can be up to 15 digits, you'll meed to cast to an 64 bit (8-byte) integer. We have multiple systems already > in place that took advantage of the implicit cast of a null '' string to an > integer of '0'. The CAST function in SQL can be used as follows: CAST ( expression AS data_type [ ( length ) ] ) Where the expression can be a text/string value, a number etc. The PostgreSQL formatting functions provide a powerful set of tools for converting various data types (date/time, integer, floating point, numeric) to formatted strings and for converting from formatted strings to specific data types. PostgreSQL CAST Convert From One Data Type Into Another, Shows you how to use PostgreSQL CAST to convert from one data type into another e.g., a string into an integer, a string to date, a string to Notice that the cast syntax with the cast operator (::) is PostgreSQL-specific and does not conform to the SQL standard. Java Convert int to String. With Numbers that you want to convert into another data type. Scenario. Data Type Formatting Functions. You can use the TO_CHAR() function to format a date as a string.. Casting data types in Postgresql String to integer Casting Postgres cast to Boolean Postgresql cast timestamp to date Postgresql cast double Hint: You will need to rewrite or cast the expression. Postgres also conforms to the SQL standard syntax . The format_mask is different whether you are converting numbers or dates. PostgreSQL CAST examples. Does anyone know of a fix? CREATE OR REPLACE FUNCTION convert_to_integer(v_input text) RETURNS INTEGER AS $$ DECLARE v_int_value INTEGER DEFAULT NULL; BEGIN BEGIN v_int_value := v_input::INTEGER; EXCEPTION WHEN OTHERS THEN RAISE NOTICE 'Invalid integer value: "%". The format that will be used to convert value to a string. You would have to hack the backend code to change this. 9.8. Convert date to string using TO_CHAR() function. The following shows the output: Even though CAST() is a standard-SQL function, not so many database systems support it.. In this example, an integer is cast as a character string: select cast(2008 as char(4)); bpchar ----- 2008. The PostgreSQL formatting functions provide a powerful set of tools for converting various data types (date/time, integer, floating point, numeric) to formatted strings and for converting from formatted strings to specific data types. The example of string to int by SQL CAST. Data Type Formatting Functions. 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