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Faster implementation of the date(), time(), and datetime() functions.

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FossilOrigin-Name: fa1b393bdb66b985f6552190a8242ed878f91d653a03352f65aa8d750de3cec4
This commit is contained in:
drh
2022-02-10 12:57:53 +00:00
parent ddd3fe6fc4
commit 522608d3a2
3 changed files with 72 additions and 17 deletions
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75
src/date.c
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@@ -1002,11 +1002,38 @@ static void datetimeFunc(
){
DateTime x;
if( isDate(context, argc, argv, &x)==0 ){
char zBuf[100];
int Y, s;
char zBuf[24];
computeYMD_HMS(&x);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%04d-%02d-%02d %02d:%02d:%02d",
x.Y, x.M, x.D, x.h, x.m, (int)(x.s));
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
Y = x.Y;
if( Y<0 ) Y = -Y;
zBuf[1] = '0' + (Y/1000)%10;
zBuf[2] = '0' + (Y/100)%10;
zBuf[3] = '0' + (Y/10)%10;
zBuf[4] = '0' + (Y)%10;
zBuf[5] = '-';
zBuf[6] = '0' + (x.M/10)%10;
zBuf[7] = '0' + (x.M)%10;
zBuf[8] = '-';
zBuf[9] = '0' + (x.D/10)%10;
zBuf[10] = '0' + (x.D)%10;
zBuf[11] = ' ';
zBuf[12] = '0' + (x.h/10)%10;
zBuf[13] = '0' + (x.h)%10;
zBuf[14] = ':';
zBuf[15] = '0' + (x.m/10)%10;
zBuf[16] = '0' + (x.m)%10;
zBuf[17] = ':';
s = (int)x.s;
zBuf[18] = '0' + (s/10)%10;
zBuf[19] = '0' + (s)%10;
zBuf[20] = 0;
if( x.Y<0 ){
zBuf[0] = '-';
sqlite3_result_text(context, zBuf, 20, SQLITE_TRANSIENT);
}else{
sqlite3_result_text(context, &zBuf[1], 19, SQLITE_TRANSIENT);
}
}
}
@@ -1022,10 +1049,20 @@ static void timeFunc(
){
DateTime x;
if( isDate(context, argc, argv, &x)==0 ){
char zBuf[100];
int s;
char zBuf[16];
computeHMS(&x);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%02d:%02d:%02d", x.h, x.m, (int)x.s);
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
zBuf[0] = '0' + (x.h/10)%10;
zBuf[1] = '0' + (x.h)%10;
zBuf[2] = ':';
zBuf[3] = '0' + (x.m/10)%10;
zBuf[4] = '0' + (x.m)%10;
zBuf[5] = ':';
s = (int)x.s;
zBuf[6] = '0' + (s/10)%10;
zBuf[7] = '0' + (s)%10;
zBuf[8] = 0;
sqlite3_result_text(context, zBuf, 8, SQLITE_TRANSIENT);
}
}
@@ -1041,10 +1078,28 @@ static void dateFunc(
){
DateTime x;
if( isDate(context, argc, argv, &x)==0 ){
char zBuf[100];
int Y;
char zBuf[16];
computeYMD(&x);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%04d-%02d-%02d", x.Y, x.M, x.D);
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
Y = x.Y;
if( Y<0 ) Y = -Y;
zBuf[1] = '0' + (Y/1000)%10;
zBuf[2] = '0' + (Y/100)%10;
zBuf[3] = '0' + (Y/10)%10;
zBuf[4] = '0' + (Y)%10;
zBuf[5] = '-';
zBuf[6] = '0' + (x.M/10)%10;
zBuf[7] = '0' + (x.M)%10;
zBuf[8] = '-';
zBuf[9] = '0' + (x.D/10)%10;
zBuf[10] = '0' + (x.D)%10;
zBuf[11] = 0;
if( x.Y<0 ){
zBuf[0] = '-';
sqlite3_result_text(context, zBuf, 11, SQLITE_TRANSIENT);
}else{
sqlite3_result_text(context, &zBuf[1], 10, SQLITE_TRANSIENT);
}
}
}