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Re: [Help-glpk] Database connectivity in MathProg
From: |
Andrew Makhorin |
Subject: |
Re: [Help-glpk] Database connectivity in MathProg |
Date: |
Sun, 17 Feb 2008 03:23:28 +0300 |
Hi Xypron,
Just a few words about implementation of the table drivers.
Currently the mathprog interpreter interacts with the driver through
the following four routines:
void mpl_tab_drv_open(MPL *mpl, int mode) opens a table for reading
(mode = 'R') or writing (mode = 'W');
int mpl_tab_drv_read(MPL *mpl) reads a next record from the table
and returns zero, or returns non-zero if there is no more records.
void mpl_tab_drv_write(MPL *mpl) writes a next record to the table.
void mpl_tab_drv_close(MPL *mpl) closes the table.
To access to the mathprog database there are the following interface
routines intended for using within the driver routine:
int mpl_tab_num_args(TABDCA *dca) returns the number of arguments
specified in the table statement being executed;
const char *mpl_tab_get_arg(TABDCA *dca, int k) returns pointer to
k-th argument;
int mpl_tab_num_flds(TABDCA *dca) returns the number of fields;
const char *mpl_tab_get_name(TABDCA *dca, int k) returns pointer to
name of k-th field;
int mpl_tab_get_type(TABDCA *dca, int k) returns type of k-th field
('?' - value not set, 'N' - floating-point number, 'S' - char string);
double mpl_tab_get_num(TABDCA *dca, int k) returns numeric value of
k-th field;
const char *mpl_tab_get_str(TABDCA *dca, int k) returns pointer to
string value of k-th field;
void mpl_tab_set_num(TABDCA *dca, int k, double num) assigns numeric
value to k-th field;
void mpl_tab_set_str(TABDCA *dca, int k, const char *str) assigns
string value to k-th field.
For implementation details you can look at the CSV table driver (see
file src/glpmpl05.c).
Best regards,
Andrew Makhorin
- Re: [Help-glpk] Database connectivity in MathProg, (continued)
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/09
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/09
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/11
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/12
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/11
- Re: [Help-glpk] Database connectivity in MathProg,
Andrew Makhorin <=
- Fwd: Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/17
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/17
- Re: [Help-glpk] Database connectivity in MathProg, glpk xypron, 2008/02/17
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/10
- RE: [Help-glpk] Database connectivity in MathProg, Meketon, Marc, 2008/02/10
- Re: [Help-glpk] Database connectivity in MathProg, Andrew Makhorin, 2008/02/10