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lib/impure - Dropped 'T' from types

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This commit is contained in:
pdw
2015-05-24 22:24:07 -05:00
committed by ringabout
parent 5da8e91358
commit 118e4667b7
1 changed files with 31 additions and 30 deletions
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61
src/db_sqlite.nim
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@@ -13,27 +13,28 @@
import strutils, sqlite3
type
TDbConn* = PSqlite3 ## encapsulates a database connection
TRow* = seq[string] ## a row of a dataset. NULL database values will be
DbConn* = PSqlite3 ## encapsulates a database connection
Row* = seq[string] ## a row of a dataset. NULL database values will be
## transformed always to the empty string.
EDb* = object of IOError ## exception that is raised if a database error occurs
TSqlQuery* = distinct string ## an SQL query string
SqlQuery* = distinct string ## an SQL query string
FDb* = object of IOEffect ## effect that denotes a database operation
FReadDb* = object of FDb ## effect that denotes a read operation
FWriteDb* = object of FDb ## effect that denotes a write operation
{.deprecated: [TRow: Row, TSqlQuery: SqlQuery, TDbConn: DbConn].}
proc sql*(query: string): TSqlQuery {.noSideEffect, inline.} =
## constructs a TSqlQuery from the string `query`. This is supposed to be
proc sql*(query: string): SqlQuery {.noSideEffect, inline.} =
## constructs a SqlQuery from the string `query`. This is supposed to be
## used as a raw-string-literal modifier:
## ``sql"update user set counter = counter + 1"``
##
## If assertions are turned off, it does nothing. If assertions are turned
## on, later versions will check the string for valid syntax.
result = TSqlQuery(query)
result = SqlQuery(query)
proc dbError(db: TDbConn) {.noreturn.} =
proc dbError(db: DbConn) {.noreturn.} =
## raises an EDb exception.
var e: ref EDb
new(e)
@@ -55,7 +56,7 @@ proc dbQuote(s: string): string =
else: add(result, c)
add(result, '\'')
proc dbFormat(formatstr: TSqlQuery, args: varargs[string]): string =
proc dbFormat(formatstr: SqlQuery, args: varargs[string]): string =
result = ""
var a = 0
for c in items(string(formatstr)):
@@ -65,7 +66,7 @@ proc dbFormat(formatstr: TSqlQuery, args: varargs[string]): string =
else:
add(result, c)
proc tryExec*(db: TDbConn, query: TSqlQuery,
proc tryExec*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): bool {.tags: [FReadDb, FWriteDb].} =
## tries to execute the query and returns true if successful, false otherwise.
var q = dbFormat(query, args)
@@ -74,29 +75,29 @@ proc tryExec*(db: TDbConn, query: TSqlQuery,
if step(stmt) == SQLITE_DONE:
result = finalize(stmt) == SQLITE_OK
proc exec*(db: TDbConn, query: TSqlQuery, args: varargs[string, `$`]) {.
proc exec*(db: DbConn, query: SqlQuery, args: varargs[string, `$`]) {.
tags: [FReadDb, FWriteDb].} =
## executes the query and raises EDB if not successful.
if not tryExec(db, query, args): dbError(db)
proc newRow(L: int): TRow =
proc newRow(L: int): Row =
newSeq(result, L)
for i in 0..L-1: result[i] = ""
proc setupQuery(db: TDbConn, query: TSqlQuery,
proc setupQuery(db: DbConn, query: SqlQuery,
args: varargs[string]): Pstmt =
var q = dbFormat(query, args)
if prepare_v2(db, q, q.len.cint, result, nil) != SQLITE_OK: dbError(db)
proc setRow(stmt: Pstmt, r: var TRow, cols: cint) =
proc setRow(stmt: Pstmt, r: var Row, cols: cint) =
for col in 0..cols-1:
setLen(r[col], column_bytes(stmt, col)) # set capacity
setLen(r[col], 0)
let x = column_text(stmt, col)
if not isNil(x): add(r[col], x)
iterator fastRows*(db: TDbConn, query: TSqlQuery,
args: varargs[string, `$`]): TRow {.tags: [FReadDb].} =
iterator fastRows*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): Row {.tags: [FReadDb].} =
## executes the query and iterates over the result dataset. This is very
## fast, but potenially dangerous: If the for-loop-body executes another
## query, the results can be undefined. For Sqlite it is safe though.
@@ -108,10 +109,10 @@ iterator fastRows*(db: TDbConn, query: TSqlQuery,
yield result
if finalize(stmt) != SQLITE_OK: dbError(db)
proc getRow*(db: TDbConn, query: TSqlQuery,
args: varargs[string, `$`]): TRow {.tags: [FReadDb].} =
proc getRow*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): Row {.tags: [FReadDb].} =
## retrieves a single row. If the query doesn't return any rows, this proc
## will return a TRow with empty strings for each column.
## will return a Row with empty strings for each column.
var stmt = setupQuery(db, query, args)
var L = (column_count(stmt))
result = newRow(L)
@@ -119,19 +120,19 @@ proc getRow*(db: TDbConn, query: TSqlQuery,
setRow(stmt, result, L)
if finalize(stmt) != SQLITE_OK: dbError(db)
proc getAllRows*(db: TDbConn, query: TSqlQuery,
args: varargs[string, `$`]): seq[TRow] {.tags: [FReadDb].} =
proc getAllRows*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): seq[Row] {.tags: [FReadDb].} =
## executes the query and returns the whole result dataset.
result = @[]
for r in fastRows(db, query, args):
result.add(r)
iterator rows*(db: TDbConn, query: TSqlQuery,
args: varargs[string, `$`]): TRow {.tags: [FReadDb].} =
iterator rows*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): Row {.tags: [FReadDb].} =
## same as `FastRows`, but slower and safe.
for r in fastRows(db, query, args): yield r
proc getValue*(db: TDbConn, query: TSqlQuery,
proc getValue*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): string {.tags: [FReadDb].} =
## executes the query and returns the first column of the first row of the
## result dataset. Returns "" if the dataset contains no rows or the database
@@ -148,7 +149,7 @@ proc getValue*(db: TDbConn, query: TSqlQuery,
result = ""
if finalize(stmt) != SQLITE_OK: dbError(db)
proc tryInsertID*(db: TDbConn, query: TSqlQuery,
proc tryInsertID*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): int64
{.tags: [FWriteDb], raises: [].} =
## executes the query (typically "INSERT") and returns the
@@ -162,7 +163,7 @@ proc tryInsertID*(db: TDbConn, query: TSqlQuery,
if finalize(stmt) != SQLITE_OK:
result = -1
proc insertID*(db: TDbConn, query: TSqlQuery,
proc insertID*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): int64 {.tags: [FWriteDb].} =
## executes the query (typically "INSERT") and returns the
## generated ID for the row. For Postgre this adds
@@ -171,7 +172,7 @@ proc insertID*(db: TDbConn, query: TSqlQuery,
result = tryInsertID(db, query, args)
if result < 0: dbError(db)
proc execAffectedRows*(db: TDbConn, query: TSqlQuery,
proc execAffectedRows*(db: DbConn, query: SqlQuery,
args: varargs[string, `$`]): int64 {.
tags: [FReadDb, FWriteDb].} =
## executes the query (typically "UPDATE") and returns the
@@ -179,21 +180,21 @@ proc execAffectedRows*(db: TDbConn, query: TSqlQuery,
exec(db, query, args)
result = changes(db)
proc close*(db: TDbConn) {.tags: [FDb].} =
proc close*(db: DbConn) {.tags: [FDb].} =
## closes the database connection.
if sqlite3.close(db) != SQLITE_OK: dbError(db)
proc open*(connection, user, password, database: string): TDbConn {.
proc open*(connection, user, password, database: string): DbConn {.
tags: [FDb].} =
## opens a database connection. Raises `EDb` if the connection could not
## be established. Only the ``connection`` parameter is used for ``sqlite``.
var db: TDbConn
var db: DbConn
if sqlite3.open(connection, db) == SQLITE_OK:
result = db
else:
dbError(db)
proc setEncoding*(connection: TDbConn, encoding: string): bool {.
proc setEncoding*(connection: DbConn, encoding: string): bool {.
tags: [FDb].} =
## sets the encoding of a database connection, returns true for
## success, false for failure.