649 lines
20 KiB
Go
649 lines
20 KiB
Go
package jet
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import "errors"
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// ROW is construct one table row from list of expressions.
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func ROW(expressions ...Expression) Expression {
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return newFunc("ROW", expressions, nil)
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}
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// ------------------ Mathematical functions ---------------//
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// ABSf calculates absolute value from float expression
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func ABSf(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("ABS", floatExpression)
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}
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// ABSi calculates absolute value from int expression
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func ABSi(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("ABS", integerExpression)
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}
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func POWER(base, exponent NumericExpression) FloatExpression {
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return NewFloatFunc("POWER", base, exponent)
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}
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// SQRT calculates square root of numeric expression
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func SQRT(numericExpression NumericExpression) FloatExpression {
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return NewFloatFunc("SQRT", numericExpression)
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}
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// CBRT calculates cube root of numeric expression
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func CBRT(numericExpression NumericExpression) FloatExpression {
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return NewFloatFunc("CBRT", numericExpression)
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}
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// CEIL calculates ceil of float expression
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func CEIL(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("CEIL", floatExpression)
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}
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// FLOOR calculates floor of float expression
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func FLOOR(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("FLOOR", floatExpression)
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}
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// ROUND calculates round of a float expressions with optional precision
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func ROUND(floatExpression FloatExpression, precision ...IntegerExpression) FloatExpression {
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if len(precision) > 0 {
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return NewFloatFunc("ROUND", floatExpression, precision[0])
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}
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return NewFloatFunc("ROUND", floatExpression)
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}
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// SIGN returns sign of float expression
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func SIGN(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("SIGN", floatExpression)
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}
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// TRUNC calculates trunc of float expression with optional precision
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func TRUNC(floatExpression FloatExpression, precision ...IntegerExpression) FloatExpression {
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if len(precision) > 0 {
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return NewFloatFunc("TRUNC", floatExpression, precision[0])
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}
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return NewFloatFunc("TRUNC", floatExpression)
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}
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// LN calculates natural algorithm of float expression
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func LN(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("LN", floatExpression)
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}
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// LOG calculates logarithm of float expression
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func LOG(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("LOG", floatExpression)
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}
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// ----------------- Aggregate functions -------------------//
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// AVG is aggregate function used to calculate avg value from numeric expression
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func AVG(numericExpression NumericExpression) FloatExpression {
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return NewFloatFunc("AVG", numericExpression)
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}
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// BIT_AND is aggregate function used to calculates the bitwise AND of all non-null input values, or null if none.
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func BIT_AND(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("BIT_AND", integerExpression)
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}
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// BIT_OR is aggregate function used to calculates the bitwise OR of all non-null input values, or null if none.
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func BIT_OR(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("BIT_OR", integerExpression)
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}
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// BOOL_AND is aggregate function. Returns true if all input values are true, otherwise false
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func BOOL_AND(boolExpression BoolExpression) BoolExpression {
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return newBoolFunc("BOOL_AND", boolExpression)
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}
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// BOOL_OR is aggregate function. Returns true if at least one input value is true, otherwise false
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func BOOL_OR(boolExpression BoolExpression) BoolExpression {
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return newBoolFunc("BOOL_OR", boolExpression)
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}
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// COUNT is aggregate function. Returns number of input rows for which the value of expression is not null.
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func COUNT(expression Expression) IntegerExpression {
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return newIntegerFunc("COUNT", expression)
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}
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// EVERY is aggregate function. Returns true if all input values are true, otherwise false
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func EVERY(boolExpression BoolExpression) BoolExpression {
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return newBoolFunc("EVERY", boolExpression)
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}
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// MAXf is aggregate function. Returns maximum value of float expression across all input values
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func MAXf(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("MAX", floatExpression)
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}
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// MAXi is aggregate function. Returns maximum value of int expression across all input values
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func MAXi(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("MAX", integerExpression)
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}
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// MINf is aggregate function. Returns minimum value of float expression across all input values
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func MINf(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("MIN", floatExpression)
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}
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// MINi is aggregate function. Returns minimum value of int expression across all input values
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func MINi(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("MIN", integerExpression)
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}
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// SUMf is aggregate function. Returns sum of expression across all float expressions
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func SUMf(floatExpression FloatExpression) FloatExpression {
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return NewFloatFunc("SUM", floatExpression)
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}
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// SUMi is aggregate function. Returns sum of expression across all integer expression.
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func SUMi(integerExpression IntegerExpression) IntegerExpression {
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return newIntegerFunc("SUM", integerExpression)
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}
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//------------ String functions ------------------//
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// BIT_LENGTH returns number of bits in string expression
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func BIT_LENGTH(stringExpression StringExpression) IntegerExpression {
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return newIntegerFunc("BIT_LENGTH", stringExpression)
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}
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// CHAR_LENGTH returns number of characters in string expression
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func CHAR_LENGTH(stringExpression StringExpression) IntegerExpression {
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return newIntegerFunc("CHAR_LENGTH", stringExpression)
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}
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// OCTET_LENGTH returns number of bytes in string expression
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func OCTET_LENGTH(stringExpression StringExpression) IntegerExpression {
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return newIntegerFunc("OCTET_LENGTH", stringExpression)
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}
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// LOWER returns string expression in lower case
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func LOWER(stringExpression StringExpression) StringExpression {
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return newStringFunc("LOWER", stringExpression)
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}
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// UPPER returns string expression in upper case
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func UPPER(stringExpression StringExpression) StringExpression {
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return newStringFunc("UPPER", stringExpression)
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}
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// BTRIM removes the longest string consisting only of characters
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// in characters (a space by default) from the start and end of string
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func BTRIM(stringExpression StringExpression, trimChars ...StringExpression) StringExpression {
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if len(trimChars) > 0 {
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return newStringFunc("BTRIM", stringExpression, trimChars[0])
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}
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return newStringFunc("BTRIM", stringExpression)
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}
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// LTRIM removes the longest string containing only characters
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// from characters (a space by default) from the start of string
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func LTRIM(str StringExpression, trimChars ...StringExpression) StringExpression {
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if len(trimChars) > 0 {
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return newStringFunc("LTRIM", str, trimChars[0])
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}
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return newStringFunc("LTRIM", str)
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}
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// RTRIM removes the longest string containing only characters
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// from characters (a space by default) from the end of string
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func RTRIM(str StringExpression, trimChars ...StringExpression) StringExpression {
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if len(trimChars) > 0 {
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return newStringFunc("RTRIM", str, trimChars[0])
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}
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return newStringFunc("RTRIM", str)
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}
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// CHR returns character with the given code.
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func CHR(integerExpression IntegerExpression) StringExpression {
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return newStringFunc("CHR", integerExpression)
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}
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//
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//func CONCAT(expressions ...Expression) StringExpression {
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// return newStringFunc("CONCAT", expressions...)
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//}
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//
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//func CONCAT_WS(expressions ...Expression) StringExpression {
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// return newStringFunc("CONCAT_WS", expressions...)
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//}
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// CONVERT converts string to dest_encoding. The original encoding is
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// specified by src_encoding. The string must be valid in this encoding.
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func CONVERT(str StringExpression, srcEncoding StringExpression, destEncoding StringExpression) StringExpression {
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return newStringFunc("CONVERT", str, srcEncoding, destEncoding)
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}
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// CONVERT_FROM converts string to the database encoding. The original
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// encoding is specified by src_encoding. The string must be valid in this encoding.
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func CONVERT_FROM(str StringExpression, srcEncoding StringExpression) StringExpression {
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return newStringFunc("CONVERT_FROM", str, srcEncoding)
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}
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// CONVERT_TO converts string to dest_encoding.
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func CONVERT_TO(str StringExpression, toEncoding StringExpression) StringExpression {
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return newStringFunc("CONVERT_TO", str, toEncoding)
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}
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// ENCODE encodes binary data into a textual representation.
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// Supported formats are: base64, hex, escape. escape converts zero bytes and
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// high-bit-set bytes to octal sequences (\nnn) and doubles backslashes.
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func ENCODE(data StringExpression, format StringExpression) StringExpression {
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return newStringFunc("ENCODE", data, format)
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}
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// DECODE decodes binary data from textual representation in string.
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// Options for format are same as in encode.
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func DECODE(data StringExpression, format StringExpression) StringExpression {
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return newStringFunc("DECODE", data, format)
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}
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//func FORMAT(formatStr StringExpression, formatArgs ...expressions) StringExpression {
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// args := []expressions{formatStr}
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// args = append(args, formatArgs...)
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// return newStringFunc("FORMAT", args...)
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//}
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// INITCAP converts the first letter of each word to upper case
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// and the rest to lower case. Words are sequences of alphanumeric
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// characters separated by non-alphanumeric characters.
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func INITCAP(str StringExpression) StringExpression {
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return newStringFunc("INITCAP", str)
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}
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// LEFT returns first n characters in the string.
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// When n is negative, return all but last |n| characters.
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func LEFT(str StringExpression, n IntegerExpression) StringExpression {
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return newStringFunc("LEFT", str, n)
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}
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// RIGHT returns last n characters in the string.
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// When n is negative, return all but first |n| characters.
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func RIGHT(str StringExpression, n IntegerExpression) StringExpression {
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return newStringFunc("RIGHT", str, n)
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}
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// LENGTH returns number of characters in string with a given encoding
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func LENGTH(str StringExpression, encoding ...StringExpression) StringExpression {
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if len(encoding) > 0 {
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return newStringFunc("LENGTH", str, encoding[0])
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}
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return newStringFunc("LENGTH", str)
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}
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// LPAD fills up the string to length length by prepending the characters
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// fill (a space by default). If the string is already longer than length
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// then it is truncated (on the right).
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func LPAD(str StringExpression, length IntegerExpression, text ...StringExpression) StringExpression {
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if len(text) > 0 {
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return newStringFunc("LPAD", str, length, text[0])
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}
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return newStringFunc("LPAD", str, length)
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}
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// RPAD fills up the string to length length by appending the characters
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// fill (a space by default). If the string is already longer than length then it is truncated.
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func RPAD(str StringExpression, length IntegerExpression, text ...StringExpression) StringExpression {
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if len(text) > 0 {
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return newStringFunc("RPAD", str, length, text[0])
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}
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return newStringFunc("RPAD", str, length)
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}
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// MD5 calculates the MD5 hash of string, returning the result in hexadecimal
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func MD5(stringExpression StringExpression) StringExpression {
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return newStringFunc("MD5", stringExpression)
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}
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// REPEAT repeats string the specified number of times
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func REPEAT(str StringExpression, n IntegerExpression) StringExpression {
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return newStringFunc("REPEAT", str, n)
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}
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// REPLACE replaces all occurrences in string of substring from with substring to
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func REPLACE(text, from, to StringExpression) StringExpression {
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return newStringFunc("REPLACE", text, from, to)
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}
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// REVERSE returns reversed string.
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func REVERSE(stringExpression StringExpression) StringExpression {
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return newStringFunc("REVERSE", stringExpression)
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}
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// STRPOS returns location of specified substring (same as position(substring in string),
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// but note the reversed argument order)
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func STRPOS(str, substring StringExpression) IntegerExpression {
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return newIntegerFunc("STRPOS", str, substring)
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}
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// SUBSTR extracts substring
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func SUBSTR(str StringExpression, from IntegerExpression, count ...IntegerExpression) StringExpression {
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if len(count) > 0 {
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return newStringFunc("SUBSTR", str, from, count[0])
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}
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return newStringFunc("SUBSTR", str, from)
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}
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// TO_ASCII convert string to ASCII from another encoding
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func TO_ASCII(str StringExpression, encoding ...StringExpression) StringExpression {
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if len(encoding) > 0 {
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return newStringFunc("TO_ASCII", str, encoding[0])
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}
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return newStringFunc("TO_ASCII", str)
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}
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// TO_HEX converts number to its equivalent hexadecimal representation
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func TO_HEX(number IntegerExpression) StringExpression {
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return newStringFunc("TO_HEX", number)
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}
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//----------Data Type Formatting Functions ----------------------//
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// TO_CHAR converts expression to string with format
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func TO_CHAR(expression Expression, format StringExpression) StringExpression {
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return newStringFunc("TO_CHAR", expression, format)
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}
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// TO_DATE converts string to date using format
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func TO_DATE(dateStr, format StringExpression) DateExpression {
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return newDateFunc("TO_DATE", dateStr, format)
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}
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// TO_NUMBER converts string to numeric using format
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func TO_NUMBER(floatStr, format StringExpression) FloatExpression {
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return NewFloatFunc("TO_NUMBER", floatStr, format)
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}
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// TO_TIMESTAMP converts string to time stamp with time zone using format
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func TO_TIMESTAMP(timestampzStr, format StringExpression) TimestampzExpression {
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return newTimestampzFunc("TO_TIMESTAMP", timestampzStr, format)
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}
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//----------------- Date/Time Functions and Operators ---------------//
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// CURRENT_DATE returns current date
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func CURRENT_DATE() DateExpression {
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dateFunc := newDateFunc("CURRENT_DATE")
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dateFunc.noBrackets = true
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return dateFunc
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}
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// CURRENT_TIME returns current time with time zone
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func CURRENT_TIME(precision ...int) TimezExpression {
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var timezFunc *timezFunc
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if len(precision) > 0 {
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timezFunc = newTimezFunc("CURRENT_TIME", constLiteral(precision[0]))
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} else {
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timezFunc = newTimezFunc("CURRENT_TIME")
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}
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timezFunc.noBrackets = true
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return timezFunc
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}
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// CURRENT_TIMESTAMP returns current timestamp with time zone
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func CURRENT_TIMESTAMP(precision ...int) TimestampzExpression {
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var timestampzFunc *timestampzFunc
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if len(precision) > 0 {
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timestampzFunc = newTimestampzFunc("CURRENT_TIMESTAMP", constLiteral(precision[0]))
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} else {
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timestampzFunc = newTimestampzFunc("CURRENT_TIMESTAMP")
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}
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timestampzFunc.noBrackets = true
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return timestampzFunc
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}
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// LOCALTIME returns local time of day using optional precision
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func LOCALTIME(precision ...int) TimeExpression {
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var timeFunc *timeFunc
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if len(precision) > 0 {
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timeFunc = newTimeFunc("LOCALTIME", constLiteral(precision[0]))
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} else {
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timeFunc = newTimeFunc("LOCALTIME")
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}
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timeFunc.noBrackets = true
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return timeFunc
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}
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// LOCALTIMESTAMP returns current date and time using optional precision
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func LOCALTIMESTAMP(precision ...int) TimestampExpression {
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var timestampFunc *timestampFunc
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if len(precision) > 0 {
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timestampFunc = newTimestampFunc("LOCALTIMESTAMP", constLiteral(precision[0]))
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} else {
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timestampFunc = newTimestampFunc("LOCALTIMESTAMP")
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}
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timestampFunc.noBrackets = true
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return timestampFunc
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}
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// NOW returns current date and time
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func NOW() TimestampzExpression {
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return newTimestampzFunc("NOW")
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}
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// --------------- Conditional Expressions Functions -------------//
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// COALESCE function returns the first of its arguments that is not null.
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func COALESCE(value Expression, values ...Expression) Expression {
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var allValues = []Expression{value}
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allValues = append(allValues, values...)
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return newFunc("COALESCE", allValues, nil)
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}
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// NULLIF function returns a null value if value1 equals value2; otherwise it returns value1.
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func NULLIF(value1, value2 Expression) Expression {
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return newFunc("NULLIF", []Expression{value1, value2}, nil)
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}
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// GREATEST selects the largest value from a list of expressions
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func GREATEST(value Expression, values ...Expression) Expression {
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var allValues = []Expression{value}
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allValues = append(allValues, values...)
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return newFunc("GREATEST", allValues, nil)
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}
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// LEAST selects the smallest value from a list of expressions
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func LEAST(value Expression, values ...Expression) Expression {
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var allValues = []Expression{value}
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allValues = append(allValues, values...)
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return newFunc("LEAST", allValues, nil)
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}
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//--------------------------------------------------------------------//
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type funcExpressionImpl struct {
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expressionInterfaceImpl
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name string
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expressions []Expression
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noBrackets bool
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}
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func newFunc(name string, expressions []Expression, parent Expression) *funcExpressionImpl {
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funcExp := &funcExpressionImpl{
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name: name,
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expressions: expressions,
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}
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if parent != nil {
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funcExp.expressionInterfaceImpl.parent = parent
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} else {
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funcExp.expressionInterfaceImpl.parent = funcExp
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}
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return funcExp
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}
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func (f *funcExpressionImpl) accept(visitor visitor) {
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visitor.visit(f)
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for _, exp := range f.expressions {
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exp.accept(visitor)
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}
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}
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func (f *funcExpressionImpl) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
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if f == nil {
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return errors.New("jet: Function expressions is nil. ")
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}
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addBrackets := !f.noBrackets || len(f.expressions) > 0
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if addBrackets {
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out.writeString(f.name + "(")
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} else {
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out.writeString(f.name)
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}
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err := serializeExpressionList(statement, f.expressions, ", ", out)
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if err != nil {
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return err
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}
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if addBrackets {
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out.writeString(")")
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}
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return nil
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}
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type boolFunc struct {
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funcExpressionImpl
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boolInterfaceImpl
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}
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func newBoolFunc(name string, expressions ...Expression) BoolExpression {
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boolFunc := &boolFunc{}
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boolFunc.funcExpressionImpl = *newFunc(name, expressions, boolFunc)
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boolFunc.boolInterfaceImpl.parent = boolFunc
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return boolFunc
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}
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type floatFunc struct {
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funcExpressionImpl
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floatInterfaceImpl
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}
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func NewFloatFunc(name string, expressions ...Expression) FloatExpression {
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floatFunc := &floatFunc{}
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floatFunc.funcExpressionImpl = *newFunc(name, expressions, floatFunc)
|
|
floatFunc.floatInterfaceImpl.parent = floatFunc
|
|
|
|
return floatFunc
|
|
}
|
|
|
|
type integerFunc struct {
|
|
funcExpressionImpl
|
|
integerInterfaceImpl
|
|
}
|
|
|
|
func newIntegerFunc(name string, expressions ...Expression) IntegerExpression {
|
|
floatFunc := &integerFunc{}
|
|
|
|
floatFunc.funcExpressionImpl = *newFunc(name, expressions, floatFunc)
|
|
floatFunc.integerInterfaceImpl.parent = floatFunc
|
|
|
|
return floatFunc
|
|
}
|
|
|
|
type stringFunc struct {
|
|
funcExpressionImpl
|
|
stringInterfaceImpl
|
|
}
|
|
|
|
func newStringFunc(name string, expressions ...Expression) StringExpression {
|
|
stringFunc := &stringFunc{}
|
|
|
|
stringFunc.funcExpressionImpl = *newFunc(name, expressions, stringFunc)
|
|
stringFunc.stringInterfaceImpl.parent = stringFunc
|
|
|
|
return stringFunc
|
|
}
|
|
|
|
type dateFunc struct {
|
|
funcExpressionImpl
|
|
dateInterfaceImpl
|
|
}
|
|
|
|
func newDateFunc(name string, expressions ...Expression) *dateFunc {
|
|
dateFunc := &dateFunc{}
|
|
|
|
dateFunc.funcExpressionImpl = *newFunc(name, expressions, dateFunc)
|
|
dateFunc.dateInterfaceImpl.parent = dateFunc
|
|
|
|
return dateFunc
|
|
}
|
|
|
|
type timeFunc struct {
|
|
funcExpressionImpl
|
|
timeInterfaceImpl
|
|
}
|
|
|
|
func newTimeFunc(name string, expressions ...Expression) *timeFunc {
|
|
timeFun := &timeFunc{}
|
|
|
|
timeFun.funcExpressionImpl = *newFunc(name, expressions, timeFun)
|
|
timeFun.timeInterfaceImpl.parent = timeFun
|
|
|
|
return timeFun
|
|
}
|
|
|
|
type timezFunc struct {
|
|
funcExpressionImpl
|
|
timezInterfaceImpl
|
|
}
|
|
|
|
func newTimezFunc(name string, expressions ...Expression) *timezFunc {
|
|
timezFun := &timezFunc{}
|
|
|
|
timezFun.funcExpressionImpl = *newFunc(name, expressions, timezFun)
|
|
timezFun.timezInterfaceImpl.parent = timezFun
|
|
|
|
return timezFun
|
|
}
|
|
|
|
type timestampFunc struct {
|
|
funcExpressionImpl
|
|
timestampInterfaceImpl
|
|
}
|
|
|
|
func newTimestampFunc(name string, expressions ...Expression) *timestampFunc {
|
|
timestampFunc := ×tampFunc{}
|
|
|
|
timestampFunc.funcExpressionImpl = *newFunc(name, expressions, timestampFunc)
|
|
timestampFunc.timestampInterfaceImpl.parent = timestampFunc
|
|
|
|
return timestampFunc
|
|
}
|
|
|
|
type timestampzFunc struct {
|
|
funcExpressionImpl
|
|
timestampzInterfaceImpl
|
|
}
|
|
|
|
func newTimestampzFunc(name string, expressions ...Expression) *timestampzFunc {
|
|
timestampzFunc := ×tampzFunc{}
|
|
|
|
timestampzFunc.funcExpressionImpl = *newFunc(name, expressions, timestampzFunc)
|
|
timestampzFunc.timestampzInterfaceImpl.parent = timestampzFunc
|
|
|
|
return timestampzFunc
|
|
}
|