Creating unique index names for PostgreSql (#113)

src/YesSql.Abstractions/ISqlDialect.cs

@@ -12,6 +12,11 @@ public interface ISqlDialect
         string PrimaryKeyString { get; }
         string NullColumnString { get; }
         bool SupportsUnique { get; }
+
+        /// <summary>
+        /// Returns whether the index names must be prefixed or not.
+        /// </summary>
+        bool PrefixIndex { get; }
         bool HasDataTypeInIdentityColumn { get; }
         bool SupportsIdentityColumns { get; }
         string IdentityColumnString { get; }

src/YesSql.Core/Sql/BaseComandInterpreter.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Data;
 using System.Linq;

src/YesSql.Core/Sql/Schema/AlterTableCommand.cs

@@ -1,13 +1,18 @@
-using System;
+using System;
 using System.Data;
 
 namespace YesSql.Sql.Schema
 {
     public class AlterTableCommand : SchemaCommand, IAlterTableCommand
     {
-        public AlterTableCommand(string name)
+        private readonly ISqlDialect _dialect;
+        private readonly string _tablePrefix;
+
+        public AlterTableCommand(string name, ISqlDialect dialect, string tablePrefix)
             : base(name, SchemaCommandType.AlterTable)
         {
+            _dialect = dialect;
+            _tablePrefix = tablePrefix;
         }
 
         public void AddColumn(string columnName, DbType dbType, Action<IAddColumnCommand> column = null)
@@ -43,12 +48,22 @@ public void AlterColumn(string columnName, Action<IAlterColumnCommand> column =
 
         public void CreateIndex(string indexName, params string[] columnNames)
         {
+            if (_dialect.PrefixIndex)
+            {
+                indexName = _tablePrefix + indexName;
+            }
+
             var command = new AddIndexCommand(Name, indexName, columnNames);
             TableCommands.Add(command);
         }
 
         public void DropIndex(string indexName)
         {
+            if (_dialect.PrefixIndex)
+            {
+                indexName = _tablePrefix + indexName;
+            }
+
             var command = new DropIndexCommand(Name, indexName);
             TableCommands.Add(command);
         }

src/YesSql.Core/Sql/SchemaBuilder.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Data;
 using Dapper;
@@ -185,7 +185,7 @@ public SchemaBuilder AlterTable(string name, Action<AlterTableCommand> table)
         {
             try
             {
-                var alterTable = new AlterTableCommand(Prefix(name));
+                var alterTable = new AlterTableCommand(Prefix(name), _dialect, _tablePrefix);
                 table(alterTable);
                 Execute(_builder.CreateSql(alterTable));
             }

src/YesSql.Provider.Common/BaseDialect.cs

@@ -115,6 +115,8 @@ public virtual string GetDropTableString(string name)
 
         public virtual string DefaultValuesInsert => "DEFAULT VALUES";
 
+        public virtual bool PrefixIndex => false;
+
         protected virtual string Quote(string value)
         {
             return SingleQuoteString + value.Replace(SingleQuoteString, DoubleSingleQuoteString) + SingleQuoteString;

src/YesSql.Provider.PostgreSql/PostgreSqlDialect.cs

@@ -51,6 +51,7 @@ public PostgreSqlDialect()
         public override string IdentitySelectString => "RETURNING ";
         public override string IdentityColumnString => "SERIAL PRIMARY KEY";
         public override bool SupportsIfExistsBeforeTableName => true;
+        public override bool PrefixIndex => true;
 
         public override string GetTypeName(DbType dbType, int? length, byte precision, byte scale)
         {