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Copy pathPostgresqlQueryWriter.cs
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43 lines (38 loc) · 1.66 KB
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using DataKit.SQL.Postgresql.QueryExpressions;
using DataKit.SQL.Providers;
using DataKit.SQL.QueryExpressions;
namespace DataKit.SQL.Postgresql
{
public class PostgresqlQueryWriter : QueryWriter
{
public void Append(string str)
=> queryText.Append(str);
public override void WriteRandomFunction(RandomFunctionCallQueryExpression randomFunctionCallQueryExpression, QueryExpressionVisitor queryExpressionVisitor)
{
queryText.Append($" FLOOR(RANDOM() * {int.MaxValue})::int ");
}
public override void WriteLastInsertedIdFunction(LastInsertedIdFunctionCallExpression lastInsertedIdFunctionCallExpression, QueryExpressionVisitor queryExpressionVisitor)
{
queryText.Append(" LASTVAL() ");
}
public override void WriteIdentifier(IdentifierQueryExpression identifierQueryExpression, QueryExpressionVisitor queryExpressionVisitor)
{
if (identifierQueryExpression is NestedIdentifierQueryExpression nestedIdentifierQueryExpression &&
nestedIdentifierQueryExpression.ParentIdentifier != null)
{
WriteIdentifier(nestedIdentifierQueryExpression.ParentIdentifier, queryExpressionVisitor);
queryText.Append(".");
}
if (identifierQueryExpression.IdentifierName == "*")
queryText.Append(" * ");
else
queryText.Append($" \"{identifierQueryExpression.IdentifierName}\" ");
}
public override void WriteExtension(QueryExpression queryExpression, QueryExpressionVisitor queryExpressionVisitor)
{
if (queryExpression is IPostgresqlExtension postgresqlExtension)
postgresqlExtension.Write(this, queryExpressionVisitor);
base.WriteExtension(queryExpression, queryExpressionVisitor);
}
}
}