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ultimatepp/uppsrc/Sql/Sqlexp.h
rylek d775296b1e Minor priority-related fixes in SqlExp 
git-svn-id: svn://ultimatepp.org/upp/trunk@1896 f0d560ea-af0d-0410-9eb7-867de7ffcac7
2010-01-15 22:02:07 +00:00

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enum {
ORACLE = 1,
SQLITE3 = 2,
MY_SQL = 4,
MSSQL = 8,
PGSQL = 16,
FIREBIRD = 32, // not implemented yet
DB2 = 64, // not implemented yet
};
class SqlBool;
class SqlVal;
class SqlSet;
class SqlSelect;
class Case;
// ----------
struct FieldOperator {
String table;
void Table(const char *name) { table = name; }
virtual void Field(Ref f);
virtual void Field(const char *name, Ref f);
FieldOperator& operator()(const char *name, Ref f) { Field(name, f); return *this; }
FieldOperator& operator()(const String& name, Ref f) { Field(name, f); return *this; }
FieldOperator& operator()(Id id, Ref f) { Field(~id, f); return *this; }
FieldOperator& operator()(const char *name, bool& b);
FieldOperator& operator()(const String& name, bool& b) { return (*this)(~name, b); }
FieldOperator& operator()(Id id, bool& b) { return (*this)(~id, b); }
FieldOperator();
virtual ~FieldOperator();
};
typedef Callback1<FieldOperator&> Fields;
struct FieldDumper : public FieldOperator {
String s;
virtual void Field(const char *name, Ref f);
};
template <class T>
String DumpFields(T& s) {
FieldDumper dump;
s.FieldLayout(dump);
return dump.s;
}
void td_scalar(SqlSet& set, const String& prefix, const char *x);
void td_array(SqlSet& set, const String& prefix, const char *x, int cnt);
void td_var(SqlSet& set, const String& prefix, const char *x, SqlSet (*f)(const String&));
void td_shrink(String *array, int cnt);
bool EqualFields(Fields a, Fields b);
// ----------
class SqlCase {
String s;
public:
SqlCase(byte cond, const String& text);
SqlCase operator()(byte cond, const String& text);
String operator()(const String& text);
String operator()();
};
String SqlCompile(byte dialect, const String& s);
String SqlFormat(int x);
String SqlFormat(double x);
String SqlFormat(int64 x);
String SqlFormat(const char *s, int len);
String SqlFormat(const char *s);
String SqlFormat(const String& x);
String SqlFormat(Date x);
String SqlFormat(Time x);
String SqlFormat(const Value& x);
String SqlFormatBinary(const char *s, int l);
String SqlFormatBinary(const String& x);
class SqlCol : Moveable<SqlCol> {
String name;
public:
String ToString() const { return name; }
const String& operator~() const { return name; }
SqlCol As(const char *as) const;
SqlCol(const String& name) : name(name) {}
};
class SqlId : Moveable<SqlId> {
protected:
Id id;
public:
bool IsEqual(SqlId b) const { return id == b.id; }
bool IsEqual(Id b) const { return id == b; }
bool IsNull() const { return id.IsNull(); }
operator Id() const { return id; }
String ToString() const { return id.ToString(); }
String operator~() const { return ToString(); }
SqlCol Of(SqlId id) const;
SqlCol Of(const char *of) const;
SqlId As(const char *as) const;
SqlId As(SqlId id) const { return As(~~id); }
SqlId operator[](int i) const;
SqlId operator&(const SqlId& s) const;
SqlId operator[](const SqlId& id) const;
SqlId() {}
SqlId(const char *s) : id(s) {}
SqlId(const String& s) : id(s) {}
SqlId(Id id) : id(id) {}
};
#define SQLID(x) const UPP::SqlId x(#x);
#define SQL_ID(n, x) const UPP::SqlId n(#x);
class SqlS : Moveable<SqlS> {
protected:
String text;
byte priority;
public:
enum PRIORITY {
EMPTY = 0,
LOW = 20,
SETOP = 50,
SET = 100,
LOR = 120,
LAND = 130,
TRUEVAL = 135,
FALSEVAL = 136,
COMP = 140,
ADD = 150,
MUL = 160,
UNARY = 170,
FN = 180,
HIGH = 200,
NULLVAL = 250,
};
String operator()() const;
String operator()(int at) const;
const String& operator~() const { return text; }
bool IsEmpty() const { return priority == EMPTY; }
SqlS() : priority(EMPTY) {}
SqlS(const char *s, int pr) : text(s), priority(pr) {}
SqlS(const String& s, int pr) : text(s), priority(pr) {}
SqlS(const SqlS& a, const char *op, const SqlS& b, int pr, int prb);
SqlS(const SqlS& a, const char *op, const SqlS& b, int pr);
};
class SqlVal : public SqlS, Moveable<SqlVal> {
public:
void SetNull() { text = "NULL"; priority = NULLVAL; }
void SetHigh(const String& s) { text = s; priority = HIGH; }
bool IsNull() const { return priority == NULLVAL; }
SqlVal As(const char *as) const;
SqlVal As(const SqlId& id) const;
SqlVal() {}
SqlVal(const String& s, int pr) : SqlS(s, pr) {}
SqlVal(const SqlS& a, const char *o, const SqlS& b, int pa, int pb)
: SqlS(a, o, b, pa, pb) {}
SqlVal(const SqlS& a, const char *o, const SqlS& b, int p)
: SqlS(a, o, b, p) {}
SqlVal(int x);
SqlVal(int64 x);
SqlVal(double x);
SqlVal(const String& x);
SqlVal(const char *x);
SqlVal(Date x);
SqlVal(Time x);
SqlVal(const Value& x);
SqlVal(const Nuller&);
SqlVal(SqlId id);
SqlVal(const SqlId& (*id)());
SqlVal(SqlCol id);
// SqlVal(const SqlSelect& x);
// SqlVal(const SqlBool& x);
SqlVal(const Case& x);
};
SqlVal operator-(const SqlVal& a);
SqlVal operator+(const SqlVal& a, const SqlVal& b);
SqlVal operator-(const SqlVal& a, const SqlVal& b);
SqlVal operator*(const SqlVal& a, const SqlVal& b);
SqlVal operator/(const SqlVal& a, const SqlVal& b);
SqlVal operator%(const SqlVal& a, const SqlVal& b);
SqlVal operator|(const SqlVal& a, const SqlVal& b); // String concatenation
SqlVal& operator+=(SqlVal& a, const SqlVal& b);
SqlVal& operator-=(SqlVal& a, const SqlVal& b);
SqlVal& operator*=(SqlVal& a, const SqlVal& b);
SqlVal& operator/=(SqlVal& a, const SqlVal& b);
SqlVal& operator%=(SqlVal& a, const SqlVal& b);
SqlVal& operator|=(SqlVal& a, const SqlVal& b);
SqlVal SqlFunc(const char* name, const SqlVal& a);
SqlVal SqlFunc(const char* name, const SqlVal& a, const SqlVal& b);
SqlVal SqlFunc(const char* name, const SqlVal& a, const SqlVal& b, const SqlVal& c);
SqlVal SqlFunc(const char* nm, const SqlVal& a, const SqlVal& b, const SqlVal& c, const SqlVal& d);
SqlVal SqlFunc(const char* name, const SqlSet& set);
SqlVal Decode(const SqlVal& exp, const SqlSet& variants);
SqlVal Distinct(const SqlVal& exp);
SqlSet Distinct(const SqlSet& columns);
SqlVal All(const SqlVal& exp);
SqlSet All(const SqlSet& columns);
SqlVal SqlAll();
SqlVal Count(const SqlVal& exp);
SqlVal Count(const SqlSet& exp);
SqlVal SqlCountRows();
SqlVal Descending(const SqlVal& exp);
SqlVal SqlMax(const SqlVal& a);
SqlVal SqlMin(const SqlVal& a);
SqlVal SqlSum(const SqlVal& a);
SqlVal Avg(const SqlVal& a);
SqlVal Stddev(const SqlVal& a);
SqlVal Variance(const SqlVal& a);
SqlVal Greatest(const SqlVal& a, const SqlVal& b);
SqlVal Least(const SqlVal& a, const SqlVal& b);
SqlVal ConvertCharset(const SqlVal& exp, const SqlVal& charset);
SqlVal ConvertAscii(const SqlVal& exp);
SqlVal Upper(const SqlVal& exp);
SqlVal Lower(const SqlVal& exp);
SqlVal Length(const SqlVal& exp);
SqlVal UpperAscii(const SqlVal& exp);
SqlVal Substr(const SqlVal& a, const SqlVal& b);
SqlVal Substr(const SqlVal& a, const SqlVal& b, const SqlVal& c);
SqlVal Instr(const SqlVal& a, const SqlVal& b);
SqlVal Wild(const char* s);
SqlVal SqlDate(const SqlVal& year, const SqlVal& month, const SqlVal& day);
SqlVal AddMonths(const SqlVal& date, const SqlVal& months);
SqlVal LastDay(const SqlVal& date);
SqlVal MonthsBetween(const SqlVal& date1, const SqlVal& date2);
SqlVal NextDay(const SqlVal& date);
SqlVal Cast(const char* type, const SqlId& a);
SqlVal SqlNvl(const SqlVal& a);
inline SqlVal Nvl(const SqlVal& a) { return SqlNvl(SqlVal(a)); }
inline SqlVal Nvl(const SqlCol& a) { return SqlNvl(SqlVal(a)); }
inline SqlVal Nvl(const SqlId& a) { return SqlNvl(SqlVal(a)); }
SqlVal SqlNvl(const SqlVal& a, const SqlVal& b);
inline SqlVal Nvl(const SqlVal& a, const SqlVal& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlVal& a, const SqlCol& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlVal& a, const SqlId& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlCol& a, const SqlVal& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlCol& a, const SqlCol& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlCol& a, const SqlId& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlId& a, const SqlVal& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlId& a, const SqlCol& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
inline SqlVal Nvl(const SqlId& a, const SqlId& b) { return SqlNvl(SqlVal(a), SqlVal(b)); }
SqlVal Prior(SqlId a);
SqlVal NextVal(SqlId a);
SqlVal CurrVal(SqlId a);
SqlVal OuterJoin(SqlCol col);
inline SqlVal operator++(SqlId a) { return NextVal(a); }
SqlVal SqlRowNum();
SqlVal SqlArg();
SqlVal SqlBinary(const String& data);
class SqlBool : public SqlS, Moveable<SqlBool> {
public:
void SetTrue();
void SetFalse();
void SetBool(bool b);
bool IsTrue() const { return priority == TRUEVAL; }
bool IsFalse() const { return priority == FALSEVAL; }
bool IsBool() const { return IsTrue() || IsFalse(); }
bool AsBool() const { ASSERT(IsBool()); return IsTrue(); }
SqlBool(const String& s, int pr) : SqlS(s, pr) {}
SqlBool(const SqlS& a, const char *o, const SqlS& b, int pa, int pb)
: SqlS(a, o, b, pa, pb) {}
SqlBool(const SqlS& a, const char *o, const SqlS& b, int p)
: SqlS(a, o, b, p) {}
static SqlBool True() { return SqlBool(true); }
static SqlBool False() { return SqlBool(false); }
SqlBool() {}
SqlBool(bool b) { SetBool(b); }
};
SqlBool operator!(const SqlBool& a);
SqlBool operator<(const SqlVal& a, const SqlVal& b);
SqlBool operator<=(const SqlVal& a, const SqlVal& b);
SqlBool operator>=(const SqlVal& a, const SqlVal& b);
SqlBool operator>(const SqlVal& a, const SqlVal& b);
SqlBool operator==(const SqlVal& a, const SqlVal& b);
SqlBool operator!=(const SqlVal& a, const SqlVal& b);
SqlBool operator||(const SqlBool& a, const SqlBool& b);
SqlBool operator&&(const SqlBool& a, const SqlBool& b);
SqlBool operator- (const SqlBool& a, const SqlBool& b);
SqlBool operator|=(SqlBool& a, const SqlBool& b);
SqlBool operator&=(SqlBool& a, const SqlBool& b);
SqlBool SqlIsNull(const SqlVal& a);
SqlBool NotNull(const SqlVal& a);
inline SqlBool IsNull(const SqlId& a) { return SqlIsNull(a); }
inline SqlBool IsNull(const SqlVal& a) { return SqlIsNull(a); }
inline SqlBool IsNull(const SqlCol& a) { return SqlIsNull(a); }
SqlBool Like(const SqlVal& a, const SqlVal& b, bool cs = false);
SqlBool NotLike(const SqlVal& a, const SqlVal& b, bool cs = false);
SqlBool Between(const SqlVal& a, const SqlVal& low, const SqlVal& high);
SqlBool NotBetween(const SqlVal&a, const SqlVal& low, const SqlVal& high);
SqlBool In(const SqlVal& a, const SqlSet& b);
SqlBool NotIn(const SqlVal& a, const SqlSet& b);
SqlBool Exists(const SqlSet& set);
SqlBool NotExists(const SqlSet& set);
SqlBool LikeUpperAscii(const SqlVal& a, const SqlVal& b);
SqlBool LeftJoin(SqlVal v1, SqlVal v2);
SqlBool RightJoin(SqlVal v1, SqlVal v2);
SqlBool Join(SqlId tab1, SqlId tab2, SqlId key);
SqlBool LeftJoin(SqlId tab1, SqlId tab2, SqlId key);
SqlBool RightJoin(SqlId tab1, SqlId tab2, SqlId key);
SqlBool SqlFirstRow();
inline SqlBool operator==(const SqlVal& a, const SqlSet& b) { return In(a, b); }
inline SqlBool operator!=(const SqlVal& a, const SqlSet& b) { return NotIn(a, b); }
inline const SqlVal& operator+(const SqlVal& a) { return a; }
class Case : public SqlS, Moveable<Case> {
public:
Case(const SqlBool& cond, const SqlVal& val)
{
text = "case when " + ~cond + " then " + ~val + " end";
}
Case& operator()(const SqlBool& cond, const SqlVal& val)
{
text.Insert(text.GetLength() - 4, " when " + ~cond + " then " + ~val);
return *this;
}
Case& operator()(const SqlVal& val)
{
text.Insert(text.GetLength() - 4, " else " + ~val);
return *this;
}
};
class Sql;
#define E__SqlVal(I) const SqlVal& p##I
SqlSet operator|(const SqlSet& s1, const SqlSet& s2); // union
SqlSet operator&(const SqlSet& s1, const SqlSet& s2); // intersection
SqlSet operator-(const SqlSet& s1, const SqlSet& s2); // difference
class SqlSet : Moveable<SqlSet> {
protected:
String text;
byte priority;
public:
enum PRIORITY {
SETOP = 50,
SET = 100,
HIGH = 200,
};
String operator~() const;
String operator()() const;
String operator()(int at) const;
bool IsEmpty() const { return text.IsEmpty(); }
SqlSet& Cat(const SqlVal& val); // adding a member
SqlSet& Cat(const SqlSet& set);
SqlSet& operator|=(const SqlVal& val) { return Cat(val); }
SqlSet& operator|=(const SqlSet& set) { return *this = *this | set; }
SqlSet& operator&=(const SqlSet& set) { return *this = *this & set; }
SqlSet& operator-=(const SqlSet& set) { return *this = *this - set; }
void Clear() { text.Clear(); }
SqlSet() {}
explicit SqlSet(const SqlVal& p0);
#define E__SqlSet(I) SqlSet(const SqlVal& p0, __List##I(E__SqlVal));
__Expand(E__SqlSet);
explicit SqlSet(Fields nfields);
SqlSet(const String& s, PRIORITY p) { text = s; priority = p; }
};
class SqlSetC : public SqlSet {
public:
SqlSetC(const String& s) { text = s; priority = SET; }
SqlSetC(const char* s) { text = s; priority = SET; }
};
class SqlStatement {
String text;
public:
SqlStatement() {}
explicit SqlStatement(const String& s) : text(s) {}
String Get(int dialect) const;
String GetText() const { return text; }
bool IsEmpty() const { return text.IsEmpty(); }
operator bool() const { return !IsEmpty(); }
//Deprecated!!!
bool Execute(Sql& cursor) const;
void Force(Sql& cursor) const;
Value Fetch(Sql& cursor) const;
bool Execute() const;
void Force() const;
Value Fetch() const;
};
class SqlSelect {
String text;
SqlSelect& InnerJoin0(const String& table);
SqlSelect& LeftJoin0(const String& table);
SqlSelect& RightJoin0(const String& table);
SqlSelect& FullJoin0(const String& table);
public:
operator bool() const { return text.GetCount(); }
SqlSelect& Hint(const char *hint);
SqlSelect& Get();
SqlSelect& From(const SqlSet& set);
SqlSelect& From(SqlId table);
SqlSelect& From(SqlId table1, SqlId table2);
SqlSelect& From(SqlId table1, SqlId table2, SqlId table3);
SqlSelect& From(const SqlVal& a) { return From(SqlSet(a)); }
SqlSelect& InnerJoin(SqlId table) { return InnerJoin0(~table); }
SqlSelect& LeftJoin(SqlId table) { return LeftJoin0(~table); }
SqlSelect& RightJoin(SqlId table) { return RightJoin0(~table); }
SqlSelect& FullJoin(SqlId table) { return FullJoin0(~table); }
SqlSelect& InnerJoin(const SqlSet& set) { return InnerJoin0(~set(SqlSet::SET)); }
SqlSelect& LeftJoin(const SqlSet& set) { return LeftJoin0(~set(SqlSet::SET)); }
SqlSelect& RightJoin(const SqlSet& set) { return RightJoin0(~set(SqlSet::SET)); }
SqlSelect& FullJoin(const SqlSet& set) { return FullJoin0(~set(SqlSet::SET)); }
SqlSelect& Where(const SqlBool& exp);
SqlSelect& On(const SqlBool& exp);
SqlSelect& StartWith(const SqlBool& exp);
SqlSelect& ConnectBy(const SqlBool& exp);
SqlSelect& GroupBy(const SqlSet& columnset);
SqlSelect& Having(const SqlBool& exp);
SqlSelect& OrderBy(const SqlSet& columnset);
SqlSelect& ForUpdate();
SqlSelect& NoWait();
SqlSelect& GroupBy(SqlVal a) { return GroupBy(SqlSet(a)); }
SqlSelect& GroupBy(SqlVal a, SqlVal b) { return GroupBy(SqlSet(a, b)); }
SqlSelect& GroupBy(SqlVal a, SqlVal b, SqlVal c) { return GroupBy(SqlSet(a, b, c)); }
SqlSelect& OrderBy(SqlVal a) { return OrderBy(SqlSet(a)); }
SqlSelect& OrderBy(SqlVal a, SqlVal b) { return OrderBy(SqlSet(a, b)); }
SqlSelect& OrderBy(SqlVal a, SqlVal b, SqlVal c) { return OrderBy(SqlSet(a, b, c)); }
SqlSelect& Limit(int limit);
SqlSelect& Limit(int64 offset, int limit);
SqlSelect& Offset(int64 offset);
operator SqlSet() const { return SqlSet(text, SqlSet::SETOP); }
operator SqlStatement() const { return SqlStatement(text); }
SqlVal AsValue() const;
SqlSelect AsTable(SqlId tab) const;
SqlSelect(Fields f);
SqlSelect(const SqlSet& s) { text = ~s; }
SqlSelect() {}
#define E__QSelect(I) SqlSelect(__List##I(E__SqlVal));
__Expand(E__QSelect);
#undef E__QSelect
bool IsEmpty() { return text.IsEmpty(); }
SqlSelect& operator|=(const SqlSelect& s2);
SqlSelect& operator&=(const SqlSelect& s2);
SqlSelect& operator-=(const SqlSelect& s2);
//Deprecated!!!
bool Execute(Sql& sql) const { return SqlStatement(*this).Execute(sql); }
void Force(Sql& sql) const { return SqlStatement(*this).Force(sql); }
Value Fetch(Sql& sql) const { return SqlStatement(*this).Fetch(sql); }
bool Execute() const { return SqlStatement(*this).Execute(); }
void Force() const { return SqlStatement(*this).Force(); }
Value Fetch() const { return SqlStatement(*this).Fetch(); }
};
SqlSelect operator|(const SqlSelect& s1, const SqlSelect& s2);
SqlSelect operator&(const SqlSelect& s1, const SqlSelect& s2);
SqlSelect operator-(const SqlSelect& s1, const SqlSelect& s2);
inline SqlSelect Select(const SqlSet& set) { return SqlSelect(set); }
inline SqlSelect Select(Fields f) { return SqlSelect(f); }
#define E__QSelect(I) SqlSelect Select(__List##I(E__SqlVal));
__Expand(E__QSelect);
#undef E__QSelect
class SqlDelete {
String text;
public:
SqlDelete& Where(const SqlBool& b);
operator SqlStatement() const { return SqlStatement(text); }
SqlDelete(SqlVal table);
//Deprecated!!!
bool Execute(Sql& sql) const { return SqlStatement(*this).Execute(sql); }
void Force(Sql& sql) const { return SqlStatement(*this).Force(sql); }
Value Fetch(Sql& sql) const { return SqlStatement(*this).Fetch(sql); }
bool Execute() const { return SqlStatement(*this).Execute(); }
void Force() const { return SqlStatement(*this).Force(); }
Value Fetch() const { return SqlStatement(*this).Fetch(); }
};
inline SqlDelete Delete(SqlVal table) { return SqlDelete(table); }
class SqlInsert {
SqlId table;
SqlId keycolumn;
SqlVal keyvalue;
SqlSet set1;
SqlSet set2;
SqlSet from;
SqlBool where;
public:
void Column(SqlId column, SqlVal val);
void Column(SqlId column) { Column(column, column); }
SqlInsert& operator()(SqlId column, SqlVal val) { Column(column, val); return *this; }
SqlInsert& operator()(SqlId column) { Column(column, column); return *this; }
SqlInsert& operator()(Fields f, bool nokey = false);
SqlInsert& From(SqlId from);
SqlInsert& From(SqlSet _from) { from = _from; return *this; }
SqlInsert& From(SqlVal from) { return From(SqlSet(from)); }
SqlInsert& Where(SqlBool w) { where = w; return *this; }
SqlId GetTable() const { return table; }
SqlId GetKeyColumn() const { return keycolumn; }
SqlVal GetKeyValue() const { return keyvalue; }
operator SqlStatement() const;
operator bool() const { return !set1.IsEmpty(); }
SqlInsert(SqlId table) : table(table) {}
SqlInsert(SqlId table, SqlSet set1, SqlSet set2) : table(table), set1(set1), set2(set2) {}
SqlInsert(Fields f, bool nokey = false);
//Deprecated!!!
bool Execute(Sql& sql) const { return SqlStatement(*this).Execute(sql); }
void Force(Sql& sql) const { return SqlStatement(*this).Force(sql); }
Value Fetch(Sql& sql) const { return SqlStatement(*this).Fetch(sql); }
bool Execute() const { return SqlStatement(*this).Execute(); }
void Force() const { return SqlStatement(*this).Force(); }
Value Fetch() const { return SqlStatement(*this).Fetch(); }
};
inline SqlInsert Insert(SqlId table) { return SqlInsert(table); }
inline SqlInsert Insert(Fields f) { return SqlInsert(f); }
inline SqlInsert InsertNoKey(Fields f) { return SqlInsert(f, true); }
class SqlUpdate {
SqlId table;
SqlSet set;
SqlBool where;
public:
void Column(SqlId column, SqlVal val);
SqlUpdate& operator()(SqlId column, SqlVal val) { Column(column, val); return *this; }
SqlUpdate& operator()(Fields f);
SqlUpdate& Where(SqlBool w) { where = w; return *this; }
operator SqlStatement() const;
operator bool() const { return !set.IsEmpty(); }
SqlUpdate(SqlId table) : table(table) {}
SqlUpdate(Fields f);
//Deprecated!!!
bool Execute(Sql& sql) const { return SqlStatement(*this).Execute(sql); }
void Force(Sql& sql) const { return SqlStatement(*this).Force(sql); }
Value Fetch(Sql& sql) const { return SqlStatement(*this).Fetch(sql); }
bool Execute() const { return SqlStatement(*this).Execute(); }
void Force() const { return SqlStatement(*this).Force(); }
Value Fetch() const { return SqlStatement(*this).Fetch(); }
};
inline SqlUpdate Update(SqlId table) { return SqlUpdate(table); }
inline SqlUpdate Update(Fields f) { return SqlUpdate(f); }
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