使用Groovy Strings作为SQL select语句

Question

Database Mysql , version 5.5.17.JDBC driver version 5.1.28 Code with Gstring:

def p = "id"

def row = sql.firstRow("select $p from Model")

print row

result:

[id:id] **!**

Code without Gstring:

def row = sql.firstRow("select id from Model")

print row

result:

[id:1]

Why?

Answer 1

Groovy is escaping the p as it treats it as a Sql parameter

Try using Sql.expand like so:

def p = 'id'
def row = sql.firstRow( "select ${Sql.expand( p )} from Model" )