169 lines
4.5 KiB
Groff
169 lines
4.5 KiB
Groff
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'\" Copyright (c) 2009 by Kevin B. Kenny.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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.TH Tdbc_Init 3 8.6 Tcl "Tcl Database Connectivity"
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'\" .so man.macros
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'\" IGNORE
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.if t .wh -1.3i ^B
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.nr ^l \n(.l
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.ad b
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.de AP
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.ie !"\\$4"" .TP \\$4
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.el \{\
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. ie !"\\$2"" .TP \\n()Cu
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. el .TP 15
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.\}
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.ta \\n()Au \\n()Bu
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.ie !"\\$3"" \{\
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\&\\$1 \\fI\\$2\\fP (\\$3)
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.\".b
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.\}
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.el \{\
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.br
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.ie !"\\$2"" \{\
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\&\\$1 \\fI\\$2\\fP
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.\}
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.el \{\
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\&\\fI\\$1\\fP
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.\}
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.\}
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..
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.\" # define tabbing values for .AP
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.de AS
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.nr )A 10n
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.if !"\\$1"" .nr )A \\w'\\$1'u+3n
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.nr )B \\n()Au+15n
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.\"
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.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
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.nr )C \\n()Bu+\\w'(in/out)'u+2n
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..
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.AS Tcl_Interp Tcl_CreateInterp in/out
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.\" # BS - start boxed text
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.\" # ^y = starting y location
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.\" # ^b = 1
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.de BS
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.br
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.mk ^y
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.if n .nf
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.if n .ti 0
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.if n \l'\\n(.lu\(ul'
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.if n .fi
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..
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.\" # BE - end boxed text (draw box now)
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.de BE
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.nf
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.ti 0
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.mk ^t
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.ie n \l'\\n(^lu\(ul'
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.el \{\
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.\" Draw four-sided box normally, but don't draw top of
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.\" box if the box started on an earlier page.
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.ie !\\n(^b-1 \{\
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\h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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.\}
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.el \}\
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\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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.\}
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.\}
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.fi
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.br
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.nr ^b 0
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..
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.\" # CS - begin code excerpt
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.de CS
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.RS
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.nf
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.ta .25i .5i .75i 1i
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..
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.\" # CE - end code excerpt
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.de CE
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.fi
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.RE
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..
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'\" END IGNORE
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.BS
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.SH "NAME"
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Tdbc_Init, Tdbc_MapSqlState, Tdbc_TokenizeSql \- C procedures to facilitate writing TDBC drivers
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.SH SYNOPSIS
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.nf
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\fB#include <tdbc.h>\fR
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int
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\fBTdbc_Init\fR(\fIinterp\fR)
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Tcl_Obj *
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\fBTdbc_TokenizeSql\fR(\fIinterp, sqlcode\fR)
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const char *
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\fBTdbc_MapSqlState\fR(\fIstate\fR)
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.fi
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.SH ARGUMENTS
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.AS "Tcl_Interp" statement in/out
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.AP Tcl_Interp *interp in/out
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Pointer to a Tcl interpreter.
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.AP "const char" *state in
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Pointer to a character string containing a 'SQL state' from a database error.
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.AP "const char" *sqlcode in
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Pointer to a character string containing a SQL statement.
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.BE
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.SH DESCRIPTION
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.PP
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The TDBC library provides several C procedures that simplify writing a TDBC
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driver. They include a procedure that tokenizes a SQL statement, locating
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variables to be substituted, and a procedure that accepts a SQL state and
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returns an error class for the interpreter error information.
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.PP
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\fBTdbc_Init\fR must be invoked prior to any other TDBC call. It accepts
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a pointer to a Tcl interpreter, and arranges to load the TDBC library. It
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returns \fBTCL_OK\fR if the Tcl library was loaded successfully, and
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\fBTCL_ERROR\fR otherwise. If \fBTCL_ERROR\fR is returned, the
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interpreter's result contains the error message.
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.PP
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\fBTdbc_TokenizeSql\fR accepts a pointer to a Tcl interpreter, and a
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pointer to a character string containing one or more SQL
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statements. It tokenizes the SQL statements, and returns a pointer to
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a Tcl_Obj that contains a list of the tokens that make up the
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statement. Concatenating the tokens together will yield the original
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SQL code. The returned Tcl_Obj has a reference count of zero. The
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caller is responsible for managing the reference count as needed.
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See \fBTOKENS\fR below for a description of what may be in the
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returned list of tokens.
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.PP
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\fBTdbc_MapSqlState\fR accepts a pointer to a string, usually five
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characters long, that is the 'SQL state' that resulted from a database
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error. It returns a character string that is suitable for inclusion as
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the error class when constructing the error code for an error in a
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TDBC driver. (By convention, the error code is a list having at least
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four elements: "\fBTDBC\fR \fIerrorClass\fR \fIsqlstate\fR
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\fIdriverName\fR \fIdetails...\fR".)
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.SH TOKENS
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Each token returned from \fBTdbc_TokenizeSql\fR may be one of the
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following:
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.IP [1]
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A bound variable, which begins with one of the
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characters '\fB:\fR', '\fB@\fR', or '\fB$\fR'. The
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remainder of the string is the variable
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name and will consist of alphanumeric characters and underscores. (The
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leading character will be be non-numeric.)
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.IP [2]
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A semicolon that separates two SQL statements.
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.IP [3]
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Something else in a SQL statement. The tokenizer does not attempt to
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parse SQL; it merely identifies bound variables (distinguishing them
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from similar strings appearing inside quotes or comments) and
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statement delimiters.
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.SH "SEE ALSO"
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tdbc(n), tdbc::mapSqlState(n), tdbc::tokenize(n)
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.SH "KEYWORDS"
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TDBC, SQL, database, tokenize
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.SH "COPYRIGHT"
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Copyright (c) 2009 by Kevin B. Kenny.
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.\" Local Variables:
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.\" mode: nroff
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.\" End:
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.\"
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