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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Loading.Sql
* File: SqlLiteDb.cs
*
* SqlLiteDb.cs is part of VNLib.Plugins.Extensions.Loading.Sql which
* is part of the larger VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Loading.Sql is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Loading.Sql is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Data;
using System.Linq;
using System.Text;
using System.Collections.Generic;
namespace VNLib.Plugins.Extensions.Loading.Sql.DatabaseBuilder.Helpers
{
internal class SqlLiteDb : AbstractDb
{
public override void BuildCreateStatment(StringBuilder builder, DataTable table)
{
builder.AppendLine("CREATE TABLE IF NOT EXISTS @tableName (");
List<DataColumn> uniqueCols = new();
//Add columns
foreach (DataColumn col in table.Columns)
{
//Get dbType string
string dbType;
//Timestamps/rowversion must be handled specially for MySql optimistic concurrency
if (col.IsTimeStamp())
{
dbType = "BINARY(8)";
//We may also set the AllowNull property
col.AllowDBNull = true;
}
else
{
dbType = GetTypeStringFromType(col.DataType);
}
builder.Append('[')
.Append(col.ColumnName)
.Append("] ")
.Append(dbType);
//Set primary key contraint
if (col.IsPrimaryKey())
{
builder.Append(" PRIMARY KEY");
}
//Set unique constraint (only if not pk)
else if (col.Unique)
{
//Add the column to unique list for later
uniqueCols.Add(col);
}
//If the value is not null, we can specify the default value
if (!col.AllowDBNull)
{
if (!string.IsNullOrWhiteSpace(col.DefaultValue?.ToString()))
{
builder.Append(" DEFAULT ");
builder.Append(col.DefaultValue);
}
else
{
//Set not null
builder.Append(" NOT NULL");
}
}
//Set auto increment
if (col.AutoIncrement)
{
builder.Append(" AUTOINCREMENT ")
.Append(col.AutoIncrementSeed);
}
//Trailing comma
builder.AppendLine(",");
//No sizing for sqlite
}
//Add unique column contraints
if (uniqueCols.Any())
{
builder.Append("UNIQUE(");
for(int i = 0; i < uniqueCols.Count;)
{
//Add column name
builder.Append(uniqueCols[i].ColumnName);
i++;
//Add trailing commas
if(i < uniqueCols.Count)
{
builder.Append(',');
}
}
//Add trailing )
builder.AppendLine(")");
}
else
{
//remove trailing comma
int index = builder.Length;
while (builder[--index] != ',')
{ }
//Remove the trailing comma
builder.Remove(index, 1);
}
//Close the create table command
builder.AppendLine(")");
//Replaced the table name variables
builder.Replace("@tableName", table.TableName);
}
protected override string GetTypeStringFromDbType(DbType type)
{
return type switch
{
DbType.AnsiString => "TEXT",
DbType.Binary => "BLOB",
DbType.Byte => "INTEGER",
DbType.Boolean => "INTEGER",
DbType.Currency => "NUMERIC",
DbType.Date => "NUMERIC",
DbType.DateTime => "NUMERIC",
DbType.Decimal => "NUMERIC",
DbType.Double => "NUMERIC",
DbType.Guid => "TEXT",
DbType.Int16 => "INTEGER",
DbType.Int32 => "INTEGER",
DbType.Int64 => "INTEGER",
DbType.Object => throw new NotSupportedException("A .NET object type is not a supported MySql data-type"),
DbType.SByte => "INTEGER",
DbType.Single => "NUMERIC",
DbType.String => "TEXT",
DbType.Time => "TEXT",
DbType.UInt16 => "INTEGER",
DbType.UInt32 => "INTEGER",
DbType.UInt64 => "INTEGER",
DbType.VarNumeric => "BLOB",
DbType.AnsiStringFixedLength => "TEXT",
DbType.StringFixedLength => "TEXT",
DbType.Xml => "TEXT",
DbType.DateTime2 => "NUMERIC",
DbType.DateTimeOffset => "NUMERIC",
_ => throw new NotSupportedException("The desired property data-type is not a supported MySql data-type"),
};
}
}
}
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