127 lines
4.2 KiB
C#
127 lines
4.2 KiB
C#
using System;
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using System.Data;
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using Microsoft.Data.Sqlite;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.EntityFrameworkCore.Migrations;
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using Microsoft.EntityFrameworkCore.Migrations.Operations;
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using Microsoft.EntityFrameworkCore.Migrations.Operations.Builders;
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using Oqtane.Databases;
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namespace Oqtane.Database.Sqlite
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{
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public class SqliteDatabase : DatabaseBase
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{
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private static string _friendlyName => "SQLite";
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private static string _name => "Sqlite";
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static SqliteDatabase()
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{
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Initialize(typeof(SqliteDatabase));
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}
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public SqliteDatabase() :base(_name, _friendlyName) { }
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public override string Provider => "Microsoft.EntityFrameworkCore.Sqlite";
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public override OperationBuilder<AddColumnOperation> AddAutoIncrementColumn(ColumnsBuilder table, string name)
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{
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return table.Column<int>(name: name, nullable: false).Annotation("Sqlite:Autoincrement", true);
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}
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public override void DropColumn(MigrationBuilder builder, string name, string table)
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{
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// SQLite supports dropping columns starting with version 3.35.0 but EF Core does not implement it yet
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// note that a column cannot be dropped if it has a UNIQUE constraint, is part of a PRIMARY KEY, is indexed, or is referenced by other parts of the schema
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builder.Sql($"ALTER TABLE {table} DROP COLUMN {name};");
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}
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public override void AlterStringColumn(MigrationBuilder builder, string name, string table, int length, bool nullable, bool unicode, string index)
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{
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// not implemented as SQLite does not support altering columns
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// note that column length does not need to be modified as SQLite uses a TEXT type which utilizes variable length strings
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}
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public override string ConcatenateSql(params string[] values)
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{
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var returnValue = String.Empty;
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for (var i = 0; i < values.Length; i++)
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{
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if (i > 0)
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{
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returnValue += " || ";
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}
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returnValue += values[i];
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}
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return returnValue;
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}
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public override int ExecuteNonQuery(string connectionString, string query)
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{
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var conn = new SqliteConnection(connectionString);
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var cmd = conn.CreateCommand();
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using (conn)
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{
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PrepareCommand(conn, cmd, query);
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var val = -1;
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try
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{
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val = cmd.ExecuteNonQuery();
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}
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catch
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{
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// an error occurred executing the query
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}
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return val;
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}
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}
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public override IDataReader ExecuteReader(string connectionString, string query)
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{
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var conn = new SqliteConnection(connectionString);
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var cmd = conn.CreateCommand();
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PrepareCommand(conn, cmd, query);
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var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
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return dr;
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}
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public override string DelimitName(string name)
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{
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return $"\"{name}\"";
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}
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public override string RewriteValue(object value)
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{
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var type = value.GetType().Name;
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if (type == "DateTime")
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{
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return $"'{value}'";
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}
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if (type == "Boolean")
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{
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return (bool)value ? "1" : "0"; // SQLite uses 1/0 for boolean values
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}
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return value.ToString();
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}
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public override DbContextOptionsBuilder UseDatabase(DbContextOptionsBuilder optionsBuilder, string connectionString)
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{
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return optionsBuilder.UseSqlite(connectionString)
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.ReplaceService<IHistoryRepository, HistoryRepository>();
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}
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private void PrepareCommand(SqliteConnection conn, SqliteCommand cmd, string query)
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{
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if (conn.State != ConnectionState.Open)
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{
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conn.Open();
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}
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cmd.Connection = conn;
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cmd.CommandText = query;
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cmd.CommandType = CommandType.Text;
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}
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}
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}
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