f28f1bf536
Implements a query creator for PostgreSQL, allowing for proper database type mapping and table creation functionalities. Enhances the library's database support by incorporating PostgreSQL-specific features such as SERIAL/BIGSERIAL for auto-increment columns and improved escape handling for table names. Improves the extensibility and compatibility of the database framework with different SQL databases.
89 lines
2.8 KiB
C#
89 lines
2.8 KiB
C#
/*
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TShock, a server mod for Terraria
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Copyright (C) 2011-2019 Pryaxis & TShock Contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using MySql.Data.MySqlClient;
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namespace TShockAPI.DB.Queries;
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/// <summary>
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/// Query Creator for PostgreSQL
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/// </summary>
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public class PostgresQueryCreator : GenericQueryCreator
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{
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/// <inheritdoc />
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public override string DbTypeToString(MySqlDbType type, int? length) => type switch
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{
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MySqlDbType.VarChar when length is not null => "VARCHAR({0})".SFormat(length),
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MySqlDbType.String when length is not null => "CHAR({0})".SFormat(length),
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MySqlDbType.Text => "TEXT",
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MySqlDbType.TinyText => "TEXT",
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MySqlDbType.MediumText => "TEXT",
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MySqlDbType.LongText => "TEXT",
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MySqlDbType.Float => "REAL",
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MySqlDbType.Double => "DOUBLE PRECISION",
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MySqlDbType.Int32 => "INT",
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MySqlDbType.Int64 => "BIGINT",
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MySqlDbType.DateTime => "TIMESTAMP",
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_ => throw new NotImplementedException(Enum.GetName(typeof(MySqlDbType), type))
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};
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/// <inheritdoc />
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protected override string EscapeTableName(string table) => table.SFormat("\"{0}\"", table);
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/// <inheritdoc />
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public override string CreateTable(SqlTable table)
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{
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ValidateSqlColumnType(table.Columns);
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IEnumerable<string> columns = table.Columns.Select(c =>
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{
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// Handle PostgreSQL-specific auto-increment using SERIAL/BIGSERIAL
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string dataType;
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if (c.AutoIncrement)
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{
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dataType = c.Type is MySqlDbType.Int32 ? "SERIAL" : "BIGSERIAL";
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}
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else
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{
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dataType = DbTypeToString(c.Type, c.Length);
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}
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return "\"{0}\" {1} {2} {3} {4}".SFormat(c.Name,
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dataType,
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c.Primary ? "PRIMARY KEY" : "",
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c.NotNull && !c.AutoIncrement ? "NOT NULL" : "", // SERIAL implies NOT NULL
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c.DefaultCurrentTimestamp ? "DEFAULT CURRENT_TIMESTAMP" : "");
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});
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string[] uniques = table.Columns
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.Where(c => c.Unique).Select(c => $"\"{c.Name}\"")
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.ToArray(); // No re-enumeration
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return "CREATE TABLE {0} ({1} {2})".SFormat(EscapeTableName(table.Name),
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string.Join(", ", columns),
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uniques.Any() ? ", UNIQUE({0})".SFormat(string.Join(", ", uniques)) : "");
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}
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/// <inheritdoc />
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public override string RenameTable(string from, string to) => /*lang=postgresql*/"ALTER TABLE {0} RENAME TO {1}".SFormat(from, to);
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}
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