SourcePro : DB Access Module for PostgreSQL User’s Guide : Technical Information : Expressions : Global Functions
Global Functions
The DB Interface Module provides a predefined set of global functions, which allow an application to build portable SQL expressions.
Table 4 lists restrictions on the global functions associated with RWDBExpr.
Table 4 – Restrictions on the use of global functions with RWDBExpr 
Function
Restriction
rwdbAvg(const RWDBExpr&)
None. Corresponds to: AVG(expr)
rwdbCast(const RWDBExpr&,
const RWDBValue&)
None. Corresponds to:CAST(expr AS type)
rwdbCast(const RWDBExpr&,
const RWDBValue&,
const RWDBExpr&)
Same as the two-expression form, as PostgreSQL does not support this form.
rwdbCast(const RWBDExpr&,
const RWDBValue&,
const RWDBExpr&,
const RWDBExpr&)
Same as the two-expression form, as PostgreSQL does not support this form.
rwdbCharLength(const RWDBExpr&)
None. Corresponds to: CHAR_LENGTH(string)
rwdbCount()
None. Corresponds to: COUNT(*)
rwdbCount(const RWDBExpr&)
None. Corresponds to: COUNT(expr)
rwdbCountDistinct(const RWDBExpr&)
None. Corresponds to: COUNT(DISTINCT expr)
rwdbCurrentUser()
None. Corresponds to: CURRENT_USER
rwdbExists(const RWDBSelectorBase&)
None. Corresponds to: EXISTS(sel)
rwdbLower(const RWDBExpr&)
None. Corresponds to: LOWER(expr)
rwdbMax(const RWDBExpr&)
None. Corresponds to: MAX(expr)
rwdbMin(const RWDBExpr&)
None. Corresponds to: MIN(expr)
rwdbName(const RWCString&,
const RWDBExpr&)
None. Corresponds to: expr AS str
rwdbPosition(const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to:POSITION(expr0 IN expr1)
rwdbSessionUser()
None. Corresponds to: SESSION_USER
rwdbSubString(const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to:SUBSTR(expr0,expr1)
rwdbSubString(const RWDBExpr&,
const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to:SUBSTR(expr0, expr1, expr2)
rwdbSum(const RWDBExpr&)
None. Corresponds to: SUM(expr)
rwdbSystemDateTime()
None. Corresponds to: NOW()
rwdbSystemUser()
None. Corresponds to: CURRENT_USER
rwdbTrimLeading(const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to: TRIM(LEADING expr0 FROM expr1)
rwdbTrimTrailing(const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to: TRIM(TRAILING expr0 FROM expr1)
rwdbTrimBoth(const RWDBExpr&,
const RWDBExpr&)
None. Corresponds to: TRIM(BOTH expr0 FROM expr1)
rwdbUpper(const RWDBExpr&)
None. Corresponds to: UPPER(expr)
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