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orm.lua
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orm.lua
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local sql = require 'sql'
local sqlite3 = require "sqlite3"
local radlib = require "radlib"
local M = {}
------------------------------------------------------------------------------
-- Initialize the database connection
------------------------------------------------------------------------------
local initialize = function( dbPath )
if dbPath ~= nil then
_G.db = sqlite3.open( dbPath )
else
_G.db = sqlite3.open_memory()
end
return db
end
M.initialize = initialize
------------------------------------------------------------------------------
-- Close the database
------------------------------------------------------------------------------
local close = function()
_G.db:close()
end
M.close = close
------------------------------------------------------------------------------
-- Return all the contents of an SQLite table as a table structure
------------------------------------------------------------------------------
local selectAll = function( tableName, params )
local result = {}
local s = sql.generateSelect({
tableName = tableName,
order = params.order,
limit = params.limit
})
for row in _G.db:nrows(s) do
result[#result+1] = row
end
return result
end
M.selectAll = selectAll
------------------------------------------------------------------------------
-- Return contents of an SQLite table filtered by a WHERE query
-- Return value is a table structure
------------------------------------------------------------------------------
local selectWhere = function(tableName, params )
local result = {}
local s = sql.generateSelect({
tableName = tableName,
where = params.where,
order = params.order,
limit = params.limit
})
for row in _G.db:nrows(s) do
result[#result+1] = row
end
return result
end
M.selectWhere = selectWhere
------------------------------------------------------------------------------
-- Return the row from the given table,
-- selected from the given key/keyValue pair
------------------------------------------------------------------------------
local selectOne = function(tableName, key, keyValue)
local result = {}
local s = sql.generateSelect({
tableName = tableName,
where = key .. " = " .. keyValue,
limit = 1
})
for row in _G.db:nrows(s) do
result[1] = row
break
end
return result[1]
end
M.selectOne = selectOne
------------------------------------------------------------------------------
-- Returns the number of rows for the given table
------------------------------------------------------------------------------
local getTableRowCount = function(tableName)
local rowCount = 0
for row in _G.db:nrows("SELECT COUNT(*) as rowcount FROM " .. tableName) do
rowCount = row.rowcount
end
return rowCount
end
M.getTableRowCount = getTableRowCount
------------------------------------------------------------------------------
-- Inserts a row into the given table
------------------------------------------------------------------------------
local insertRow = function( tableName, row )
-- temporary holding variables
local columnList = " ( "
local valuesList = " VALUES("
-- format column values into SQL-safe strings
-- then concatenate them together
for i,v in pairs(row) do
local colName = i
local colValue = v
if type(v) == 'string' then
colValue = radlib.string.toSqlString(v)
end
columnList = columnList .. colName .. ","
valuesList = valuesList .. colValue .. ","
end
-- strip off the trailing comma and add a closing parentheses
columnList = string.sub( columnList, 1, columnList:len()-1 ) .. ')'
valuesList = string.sub( valuesList, 1, valuesList:len()-1 ) .. ')'
-- prepare the complete SQL command
local sql = "INSERT INTO " .. tableName .. columnList .. valuesList
-- execute the SQL command for inserting the row
_G.db:exec( sql )
end
M.insertRow = insertRow
------------------------------------------------------------------------------
-- Updates a row on the given table
------------------------------------------------------------------------------
local updateRow = function( tableName, recordData )
-- format column values into SQL-safe strings
-- then concatenate them together
local updateStr = ''
for i,v in pairs(recordData) do
if i ~= 'id' then
local colName = i
local colValue = v
if type(v) == 'string' then
colValue = radlib.string.toSqlString(v)
end
updateStr = updateStr .. colName .. " = " .. colValue .. ","
end
end
-- remove the trailing comma
updateStr = string.sub( updateStr, 1, #updateStr-1 )
local sql = "UPDATE " .. tableName .. " SET " .. updateStr .. " WHERE id = " .. recordData.id
db:exec( sql )
end
M.updateRow = updateRow
------------------------------------------------------------------------------
-- If a matching id already exists in the database, do an update
-- otherwise do an insert
------------------------------------------------------------------------------
local createOrUpdate = function( tableName, recordData )
local existingRecord = nil
if recordData.id ~= nil then
existingRecord = M.selectOne( tableName, 'id', recordData.id )
end
if existingRecord == nil then
M.insertRow( tableName, recordData )
else
M.updateRow( tableName, recordData )
end
end
M.createOrUpdate = createOrUpdate
------------------------------------------------------------------------------
-- Updates all rows in the given table
------------------------------------------------------------------------------
local updateAll = function( tablename, updateSql )
local str = "UPDATE " .. tablename ..
" SET " .. updateSql
db:exec( str )
end
M.updateAll = updateAll
------------------------------------------------------------------------------
-- Updates one column for one row in a given table
------------------------------------------------------------------------------
local updateAttribute = function( tablename, filter, columnName, columnValue )
if type(columnValue) == 'string' then
columnValue = radlib.string.toSqlString( columnValue )
end
local updateStr = "UPDATE " .. tablename ..
" SET " .. columnName .. " = " .. columnValue ..
" WHERE " .. filter
db:exec( updateStr )
end
M.updateAttribute = updateAttribute
------------------------------------------------------------------------------
-- Updates multiple columns for one row in a given table
------------------------------------------------------------------------------
local updateAttributes = function( tablename, filter, columns, columnValues )
local updateStr = ''
local newValue = nil
for i,v in ipairs(columns) do
if type(v) == 'string' then
newValue = radlib.string.toSqlString( columnValues[i] )
else
newValue = columnValues[i]
end
updateStr = updateStr .. v .. " = " .. newValue
if i < #columns then
updateStr = updateStr .. ", "
end
end
db:exec(
"UPDATE " .. tablename .. " SET " ..
updateStr ..
" WHERE " .. filter
)
end
M.updateAttributes = updateAttributes
------------------------------------------------------------------------------
-- Updates all rows that match the filter in the given table
------------------------------------------------------------------------------
local updateWhere = function( tablename, updateSql, filter )
local str = "UPDATE " .. tablename ..
" SET " .. updateSql ..
" WHERE " .. filter
db:exec( str )
end
M.updateWhere = updateWhere
return M