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424 lines
18 KiB
424 lines
18 KiB
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.Common;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using Npgsql;
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namespace Patcher.DB {
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class PostgresDBTraits : IDBTraits {
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private static DbDataReader ExecuteReader(DbCommand command) {
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Logger.instance.Log(command.CommandText);
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return command.ExecuteReader();
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}
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private static int ExecuteNonQuery(DbCommand command) {
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Logger.instance.Log(command.CommandText);
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return command.ExecuteNonQuery();
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}
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public static readonly IDBTraits instance = new PostgresDBTraits();
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protected PostgresDBTraits() {
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}
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private static readonly Regex ALPHANUMERIC = new Regex("^[a-zA-Z]\\w*$", RegexOptions.Compiled | RegexOptions.Singleline);
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private static string _EscapeName(string name) {
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if(!ALPHANUMERIC.IsMatch(name)) throw new ApplicationException("Name should contain only alphanumeric characters");
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return string.Format("\"{0}\"", name);
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}
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string IDBTraits.EscapeName(string name) {
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return _EscapeName(name);
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}
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DbConnection IDBTraits.CreateConnection(string connectionString) {
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NpgsqlConnection connection = new NpgsqlConnection(connectionString);
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connection.Open();
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return connection;
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}
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string IDBTraits.MarkParam(string paramName) {
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if(!ALPHANUMERIC.IsMatch(paramName)) throw new ApplicationException("Name should contain only alphanumeric characters");
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return ":" + paramName;
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}
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string IDBTraits.ParamName(string paramName) {
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if(!ALPHANUMERIC.IsMatch(paramName)) throw new ApplicationException("Name should contain only alphanumeric characters");
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return paramName;
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}
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private static void AddParam(DbCommand command, string name, DbType type, object value) {
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var param = command.CreateParameter();
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param.ParameterName = name;
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param.DbType = type;
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param.Value = value;
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command.Parameters.Add(param);
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}
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private static bool ParseBoolString(string value) {
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switch(value.ToLower()) {
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case "n":
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return false;
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case "y":
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return true;
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default:
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throw new ApplicationException(string.Format("Unknown value {0}", value));
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}
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}
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private static string ParseTypeString(string type) {
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switch(type.ToLower()) {
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case "int4":
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return "integer";
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default:
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return type;
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}
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}
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private static T CastResult<T>(object value) where T : class {
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if(DBNull.Value.Equals(value)) {
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return null;
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} else {
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return (T)value;
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}
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}
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private static T? CastScalarResult<T>(object value) where T : struct {
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if(DBNull.Value.Equals(value)) {
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return null;
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} else {
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return (T)value;
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}
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}
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private static readonly SQLQueryManager _SQLQueryManager = new SQLQueryManager(_EscapeName);
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StoredProcedureBody IDBTraits.GetStoredProcedureBody(Func<DbCommand> commandCreator, StoredProcedureReference procedure) {
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throw new NotImplementedException();
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}
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private static string FormatStoredProcedureHeader(StoredProcedureReference procedure) {
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throw new NotImplementedException();
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}
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void IDBTraits.ReplaceStoredProcedureBody(Func<DbCommand> commandCreator, StoredProcedureReference procedure, StoredProcedureBody newBody) {
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throw new NotImplementedException();
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}
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void IDBTraits.RemoveStoredProcedure(Func<DbCommand> commandCreator, StoredProcedureReference procedure) {
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throw new NotImplementedException();
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}
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void IDBTraits.CreateView(Func<DbCommand> commandCreator, string viewName, string body) {
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throw new NotImplementedException();
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}
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void IDBTraits.RemoveView(Func<DbCommand> commandCreator, string viewName) {
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throw new NotImplementedException();
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}
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void IDBTraits.CreateStoredProcedure(Func<DbCommand> commandCreator, StoredProcedureReference procedure, StoredProcedureBody body) {
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throw new NotImplementedException();
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}
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string IDBTraits.GetViewBody(Func<DbCommand> commandCreator, string name) {
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throw new NotImplementedException();
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}
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ColumnOptions IDBTraits.GetColumnOptions(Func<DbCommand> commandCreator, ColumnReference column) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = "SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar, a.attnotnull AS notnull, d.adsrc AS defaultvalue FROM pg_attribute a JOIN pg_class c ON a.attrelid = c.oid JOIN pg_type t ON a.atttypid = t.oid LEFT JOIN pg_attrdef d ON c.oid = d.adrelid AND a.attnum = d.adnum WHERE a.attnum > 0 AND c.relname = :ptable and a.attname = :pcolumn";
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AddParam(command, "ptable", DbType.String, column.tableName);
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AddParam(command, "pcolumn", DbType.String, column.columnName);
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using(DbDataReader reader = ExecuteReader(command)) {
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if(!reader.Read()) {
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throw new ApplicationException("Column not found");
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}
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return new ColumnOptions(
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ParseTypeString(reader.GetString(reader.GetOrdinal("type"))),
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reader.GetString(reader.GetOrdinal("defaultvalue")),
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reader.GetBoolean(reader.GetOrdinal("notnull"))
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);
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}
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}
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}
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void IDBTraits.RemoveColumn(Func<DbCommand> commandCreator, ColumnReference column) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.RemoveColumn(column);
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ExecuteNonQuery(command);
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}
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}
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void IDBTraits.CreateColumn(Func<DbCommand> commandCreator, ColumnDescription description) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.CreateColumn(description);
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ExecuteNonQuery(command);
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}
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}
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void IDBTraits.ModifyColumn(Func<DbCommand> commandCreator, ColumnDescription description) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.ModifyColumnPostgresStyle(description);
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ExecuteNonQuery(command);
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}
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}
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private static string GetStringRepresentation(ForeignKeyConstraint.ReferentialAction action) {
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switch(action) {
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case ForeignKeyConstraint.ReferentialAction.NoAction:
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return "a";
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case ForeignKeyConstraint.ReferentialAction.Cascade:
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return "c";
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case ForeignKeyConstraint.ReferentialAction.SetNull:
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return "n";
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case ForeignKeyConstraint.ReferentialAction.SetDefault:
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return "d";
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case ForeignKeyConstraint.ReferentialAction.Restrict:
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return "r";
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default:
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throw new ApplicationException("Unknown referential action");
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}
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}
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private void CheckConstraint(Func<DbCommand> commandCreator, ForeignKeyConstraint constraint) {
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Int64 referencedTableOid;
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Int16[] attnums;
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Int16[] fattnums;
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using(DbCommand command = commandCreator()) {
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command.CommandText = "select c.* from pg_constraint c join pg_class r on c.conrelid = r.oid where r.relname = :ptable and c.conname = :pconstraint";
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AddParam(command, "ptable", DbType.String, constraint.table);
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AddParam(command, "pconstraint", DbType.String, constraint.name);
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using(var reader = ExecuteReader(command)) {
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if(!reader.Read()) {
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throw new FormattableException("Constraint {0}.{1} not found", constraint.table, constraint.name);
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}
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if(reader.GetValue("contype").ToString() != "f") {
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throw new FormattableException("Constraint {0}.{1} wrong type: expected {2}, got {3}", constraint.table, constraint.name, "C", reader.GetValue("contype"));
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}
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if(reader.GetValue("confdeltype").ToString() != GetStringRepresentation(constraint.onDelete)) {
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throw new FormattableException("Constraint {0}.{1} wrong on delete action: expected {2}, got {3}", constraint.table, constraint.name, GetStringRepresentation(constraint.onDelete), reader.GetValue("confdeltype"));
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}
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if(reader.GetValue("confupdtype").ToString() != GetStringRepresentation(constraint.onUpdate)) {
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throw new FormattableException("Constraint {0}.{1} wrong on update action: expected {2}, got {3}", constraint.table, constraint.name, GetStringRepresentation(constraint.onUpdate), reader.GetValue("confupdtype"));
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}
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attnums = (Int16[])reader.GetValue("conkey");
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fattnums = (Int16[])reader.GetValue("confkey");
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referencedTableOid = (Int64)reader.GetValue("confrelid");
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}
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if(attnums.Length != 1 || fattnums.Length != 1) {
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throw new FormattableException("More than one field participating in {0}.{1}", constraint.table, constraint.name);
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}
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}
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using(DbCommand command = commandCreator()) {
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command.CommandText = "select c.*, r.relname relname from pg_constraint c join pg_class r on c.conrelid = r.oid where r.oid = :prelid and c.contype = :ptype";
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AddParam(command, "prelid", DbType.Int64, referencedTableOid);
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AddParam(command, "ptype", DbType.String, "p");
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using(var reader = ExecuteReader(command)) {
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reader.Read();
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if(reader.GetValue("relname").ToString() != constraint.referencedTable) {
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throw new FormattableException("Constraint {0}.{1} wrong referenced table: expected {2}, got {3}", constraint.table, constraint.name, reader.GetValue("relname"), constraint.referencedTable);
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}
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Int16[] rattnums = (Int16[])reader.GetValue("conkey");
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if(rattnums.Length != 1) {
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throw new FormattableException("Referenced table {0} primary key consists of {1} columns", constraint.referencedTable, rattnums.Length);
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}
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if(rattnums[0] != fattnums[0]) {
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throw new FormattableException("Referenced column {2} for constraint {0}.{1} differs from column {3} used in a primary key of referenced table", constraint.table, constraint.name, fattnums[0], rattnums[0]);
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}
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}
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}
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using(DbCommand command = commandCreator()) {
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command.CommandText = "SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar, a.attnotnull AS notnull, d.adsrc AS defaultvalue FROM pg_attribute a JOIN pg_class c ON a.attrelid = c.oid JOIN pg_type t ON a.atttypid = t.oid LEFT JOIN pg_attrdef d ON c.oid = d.adrelid AND a.attnum = d.adnum WHERE c.relname = :ptable and a.attnum = :pattnum";
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AddParam(command, "ptable", DbType.String, constraint.table);
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AddParam(command, "pattnum", DbType.Int16, attnums[0]);
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using(var reader = ExecuteReader(command)) {
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reader.Read();
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if(reader.GetValue("field").ToString() != constraint.column) {
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throw new FormattableException("Constraint {0}.{1} wrong column: expected {2}, got {3}", constraint.table, constraint.name, constraint.column, reader.GetValue("field"));
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}
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}
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}
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}
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private void CheckConstraint(Func<DbCommand> commandCreator, UniqueConstraint constraint) {
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Int16[] attnums = null;
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using(DbCommand command = commandCreator()) {
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command.CommandText = "select c.* from pg_constraint c join pg_class r on c.conrelid = r.oid where r.relname = :ptable and c.conname = :pconstraint";
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AddParam(command, "ptable", DbType.String, constraint.table);
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AddParam(command, "pconstraint", DbType.String, constraint.name);
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using(var reader = ExecuteReader(command)) {
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if(!reader.Read()) {
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throw new FormattableException("Constraint {0}.{1} not found", constraint.table, constraint.name);
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}
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if(reader.GetValue("contype").ToString() != "u") {
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throw new FormattableException("Constraint {0}.{1} wrong type: expected {2}, got {3}", constraint.table, constraint.name, "C", reader.GetValue("contype"));
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}
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attnums = (Int16[])reader.GetValue("conkey");
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}
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}
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using(DbCommand command = commandCreator()) {
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command.CommandText = string.Format("SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar, a.attnotnull AS notnull, d.adsrc AS defaultvalue FROM pg_attribute a JOIN pg_class c ON a.attrelid = c.oid JOIN pg_type t ON a.atttypid = t.oid LEFT JOIN pg_attrdef d ON c.oid = d.adrelid AND a.attnum = d.adnum WHERE c.relname = :ptable and a.attnum in ({0})", string.Join(", ", (from i in Enumerable.Range(0, attnums.Length) select ":pattnum" + i).ToArray()));
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AddParam(command, "ptable", DbType.String, constraint.table);
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for(int i=0; i<attnums.Length; i++) {
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AddParam(command, "pattnum" + i, DbType.Int16, attnums[i]);
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}
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using(var reader = ExecuteReader(command)) {
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HashSet<string> dbColumns = new HashSet<string>();
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while(reader.Read()) {
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dbColumns.Add(reader.GetValue("field").ToString());
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}
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if(!dbColumns.IsSubsetOf(constraint.columns)) {
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throw new FormattableException("Some columns are not mentioned in constraint definition: {0}", string.Join(",", dbColumns.Except(constraint.columns).ToArray()));
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}
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if(!dbColumns.IsSupersetOf(constraint.columns)) {
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throw new FormattableException("Some columns are missed in DB: {0}", string.Join(",", constraint.columns.Except(dbColumns).ToArray()));
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}
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}
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}
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}
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private void CheckConstraint(Func<DbCommand> commandCreator, CheckConstraint constraint) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = "select c.* from pg_constraint c join pg_class r on c.conrelid = r.oid where r.relname = :ptable and c.conname = :pconstraint";
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AddParam(command, "ptable", DbType.String, constraint.table);
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AddParam(command, "pconstraint", DbType.String, constraint.name);
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using(var reader = ExecuteReader(command)) {
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if(!reader.Read()) {
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throw new FormattableException("Constraint {0}.{1} not found", constraint.table, constraint.name);
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}
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if(reader.GetValue("contype").ToString() != "c") {
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throw new FormattableException("Constraint {0}.{1} wrong type: expected {2}, got {3}", constraint.table, constraint.name, "C", reader.GetValue("contype"));
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}
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if(reader.GetValue("consrc").ToString() != constraint.condition) {
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throw new FormattableException("Constraint {0}.{1} wrong condition: expected {2}, got {3}", constraint.table, constraint.name, constraint.condition, reader.GetValue("consrc"));
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}
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}
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}
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}
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private void CheckConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
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constraint.Accept(fkc => CheckConstraint(commandCreator, fkc), uc => CheckConstraint(commandCreator, uc), cc => CheckConstraint(commandCreator, cc));
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}
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public void RemoveConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
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CheckConstraint(commandCreator, constraint);
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.DropConstraint(constraint);
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ExecuteNonQuery(command);
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}
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}
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public void CreateConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.CreateConstraint(constraint);
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ExecuteNonQuery(command);
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}
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}
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public void CreateTable(Func<DbCommand> commandCreator, TableDescription table) {
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.CreateTable(table);
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ExecuteNonQuery(command);
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}
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}
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private void CheckTable(Func<DbCommand> commandCreator, TableDescription table) {
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HashSet<string> columns = new HashSet<string>(from column in table.columns select column.column.columnName);
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columns.Add(table.primaryKey.column.columnName);
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using(DbCommand command = commandCreator())
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{
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command.CommandText = "SELECT attname FROM pg_attribute, pg_class WHERE pg_class.oid = attrelid AND attnum>0 AND relname = ':ptable'";
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AddParam(command, "ptable", DbType.String, table.table);
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using(var reader = ExecuteReader(command))
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{
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HashSet<string> dbColumns = new HashSet<string>();
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while(reader.Read())
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{
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dbColumns.Add(reader.GetValue("attname").ToString());
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}
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if(!dbColumns.IsSubsetOf(columns))
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{
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throw new FormattableException("Some columns are not mentioned in table definition: {0}", string.Join(",", dbColumns.Except(columns).ToArray()));
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}
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if(!dbColumns.IsSupersetOf(columns))
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{
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throw new FormattableException("Some columns are missed in DB: {0}", string.Join(",", columns.Except(dbColumns).ToArray()));
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}
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}
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}
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var options = (this as IDBTraits).GetColumnOptions(commandCreator, table.primaryKey.column);
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/*Console.WriteLine();
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Console.WriteLine("'{0}' vs '{1}'", table.primaryKey.options.type, options.type);
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Console.WriteLine("'{0}' vs '{1}'", table.primaryKey.options.defaultValue, options.defaultValue);
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Console.WriteLine("'{0}' vs '{1}'", table.primaryKey.options.isNotNull, options.isNotNull);*/
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if(!table.primaryKey.options.Equals((this as IDBTraits).GetColumnOptions(commandCreator, table.primaryKey.column))) {
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throw new FormattableException("Column {0} definition mismatch", table.primaryKey.column.columnName);
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}
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foreach(var column in table.columns) {
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options = (this as IDBTraits).GetColumnOptions(commandCreator, column.column);
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/*Console.WriteLine();
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Console.WriteLine("'{0}' vs '{1}'", column.options.type, options.type);
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Console.WriteLine("'{0}' vs '{1}'", column.options.defaultValue, options.defaultValue);
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Console.WriteLine("'{0}' vs '{1}'", column.options.isNotNull, options.isNotNull);*/
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if(!column.options.Equals((this as IDBTraits).GetColumnOptions(commandCreator, column.column))) {
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throw new FormattableException("Column {0} definition mismatch", column.column.columnName);
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}
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}
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}
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void IDBTraits.RemoveTable(Func<DbCommand> commandCreator, TableDescription table) {
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this.CheckTable(commandCreator, table);
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using(DbCommand command = commandCreator()) {
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command.CommandText = _SQLQueryManager.DropTable(table.table);
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ExecuteNonQuery(command);
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}
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}
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bool IDBTraits.IsDDLTransactional {
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get { return true; }
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}
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}
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}
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