Override GetColumnContentSize for Postgre SQL

Author: JaBistDuNarrisch

src/Migrator.Tests/Providers/PostgreSQL/PostgreSQLTransformationProvider_GetColumnContentSize.cs

@@ -0,0 +1,35 @@
+using System.Data;
+using DotNetProjects.Migrator.Framework;
+using NUnit.Framework;
+
+namespace Migrator.Tests.Providers.PostgreSQL;
+
+[TestFixture]
+[Category("Postgre")]
+public class PostgreSQLTransformationProvider_GetColumnContentSizeTests : PostgreSQLTransformationProviderTestBase
+{
+    private const decimal DecimalDefaultValue = 14.56565m;
+
+    [Test]
+    public void GetColumnContentSize_DefaultValues_Succeeds()
+    {
+        // Arrange
+        const string testTableName = "testtable";
+
+        const string stringColumnName = "stringcolumn";
+
+        Provider.AddTable(testTableName,
+            new Column(stringColumnName, DbType.String, 5000)
+        );
+
+        Provider.Insert(testTableName, [stringColumnName], [new string('A', 44)]);
+        Provider.Insert(testTableName, [stringColumnName], [new string('B', 444)]);
+        Provider.Insert(testTableName, [stringColumnName], [new string('C', 4444)]);
+
+        // Act
+        var columnContentSize = Provider.GetColumnContentSize(testTableName, stringColumnName);
+
+        // Assert
+        Assert.That(columnContentSize, Is.EqualTo(4444));
+    }
+}

src/Migrator/Providers/Impl/PostgreSQL/PostgreSQLTransformationProvider.cs

@@ -249,6 +249,18 @@ public override string[] GetTables()
         return tables.ToArray();
     }
 
+    public override int GetColumnContentSize(string table, string columnName)
+    {
+        var result = ExecuteScalar($"SELECT MAX(LENGTH({QuoteColumnNameIfRequired(columnName)})) FROM {QuoteTableNameIfRequired(table)}");
+
+        if (result == DBNull.Value)
+        {
+            return 0;
+        }
+
+        return Convert.ToInt32(result);
+    }
+
     public override Column[] GetColumns(string table)
     {
         var stringBuilder = new StringBuilder();

src/Migrator/Providers/Impl/SqlServer/SqlServerTransformationProvider.cs

@@ -276,11 +276,11 @@ FROM    sys.[indexes] Ind
 
                     if (!reader.IsDBNull(6))
                     {
-                        idx.KeyColumns = (reader.GetString(6).Split(','));
+                        idx.KeyColumns = reader.GetString(6).Split(',');
                     }
                     if (!reader.IsDBNull(7))
                     {
-                        idx.IncludeColumns = (reader.GetString(7).Split(','));
+                        idx.IncludeColumns = reader.GetString(7).Split(',');
                     }
 
                     retVal.Add(idx);
@@ -293,7 +293,7 @@ FROM    sys.[indexes] Ind
 
     public override int GetColumnContentSize(string table, string columnName)
     {
-        var result = this.ExecuteScalar("SELECT MAX(LEN(" + this.QuoteColumnNameIfRequired(columnName) + ")) FROM " + this.QuoteTableNameIfRequired(table));
+        var result = ExecuteScalar("SELECT MAX(LEN(" + this.QuoteColumnNameIfRequired(columnName) + ")) FROM " + this.QuoteTableNameIfRequired(table));
 
         if (result == DBNull.Value)
         {