问题
The SQL is am using is:
SET @person1_id = ?;
SET @person2_id = ?;
SET @safety_factor = ?;
SELECT *
FROM table
WHERE person1 = @person1_id
AND person2 = @person2_id
AND safety_factor = @safety_factor;
That's not the exact code, but shows what i'm trying to do
The way I then input parameters is
Statement stmt = connection.prepareStatement(*script*)
stmt.setLong(1, person1.id)
stmt.setLong(2, person2.id)
stmt.setBigDecimal(3, safetyFactor)
I'm using variables in the sql because the values are used repeatedly throughout the script, and I don't want to have to input the same value multiple times as different parameters.
This gives me an error,
Exception in thread "main" org.h2.jdbc.JdbcSQLException: Invalid value "2" for parameter "parameterIndex" [90008-195]
I imagine this is to do with the script being treated as four separate statements, but I don't know how to execute them seperately and have the variables work between statements.
回答1:
H2 cannot handle a parameterised query with multiple sql statements. When setting a parameter, it will only look as far as the first semicolon, meaning that it only sees 1 parameter to be set.
Since user-defined variables are session scoped, we can set the variables in a separate statement.
PreparedStatement statement = connection.prepareStatement("SET @person1_id = ?")
statement.setLong(1, person1.id)
statement.execute()
PreparedStatement statement = connection.prepareStatement("SET @person2_id = ?")
statement.setLong(1, person2.id)
statement.execute()
...
回答2:
I don't know it this will help, but in this case I usually use another syntax (for SQL Server):
declare @person1_id long
declare @person2_id long
declare @safety_factor int
SELECT @person1_id=?, @person2_id=?, @safety_factor=?
SELECT *
FROM table
WHERE person1 = @person1_id
AND person2 = @person2_id
AND safety_factor = @safety_factor;
来源：https://stackoverflow.com/questions/45263348/user-defined-variables-set-by-parameters