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sysbench测试oracle自定义lua以使用绑定变量，
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pathtest = string.match(test,"(.*/)") or ""
dofile(pathtest .. "common.lua")
function thread_init(thread_id)
local table_name
set_vars()
table_name = "equ_run_data"
stmt = db_prepare("UPDATE ".. table_name .." SET col10=(substr((dbms_random.value),1,11)),col24=(substr((dbms_random.value),11)) WHERE eid= to_number(:x) and 'a' = :y")
params = {}
params[1] = '123'
params[2] = 'a'
db_bind_param(stmt,params)
end
function event(thread_id)
local table_name
params[1] = string.format("%d",sb_rand(1,oltp_table_size))
params[2] = 'a'
db_execute(stmt)
db_query('COMMIT')
end
