2d839e3609
Improves SQL query execution by ensuring proper casing for identifiers across various database types, particularly for Postgres. Enhances security and compatibility by using an identifier escaping method, preventing potential errors due to case sensitivity in SQL queries. Addresses potential issues with existing queries for better reliability and consistency.
87 lines
2.8 KiB
C#
87 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 {EscapeTableName(table.Name)} ({string.Join(", ", columns)} {(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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